148 Charles H. Peterson LETHAIA 9 (1976)

1972: Diversity and pattern in plants and insects.

Peterson, C. H. 1972: Species diversity, disturbance, and time in the bivalve communities of some coastal lagoons. Ph.D. thesis, University of California, Santa Barbara. 229 pp.

Peterson, C. H. 1975: Stability of species and of community for the benthos of two lagoons. Ecology

Sanders, H. L. 1968: Marine benthic diversity: a comparative study. A m . Not. 102, 243-282.

Sanders, H. L. 1969: Benthic marine diversity and the stability-time hypothesis. Brookhaven Symp. Biol.

Ecology 53. 819-829.

56, 958-965.

22, 71-81.

Shannon, C. E. L Weaver, W. 1963: The Mafhematical Theory of Communication. University of Illinois Press, Urbana, 111.

Valentine, J. W. 1961: Paleoecologic molluscan geog- raphy of the California Pleistocene. Univ. Calif. Pub. Geol. Sci. 34, 3 0 9 4 2 .

Van Valen, L. 1964: Relative abundance of species in some fossil mammal faunas. Am. Nat. 98, 109- 116.

Warme, J. E. 1969: Live and dead molluscs in a coastal lagoon. I. Paleontol. 43, 141-150.

Warme, J. E. 1971: Paleoecological aspects of a modern coastal lagoon. Univ. Calif. Pub. Geol. Sci. 87, 1-131.

Nouvelles IbPro-Armoricaines is an informal newslet- ter which will be issued annually. It is a form of con- tact between research workers around the world on Cambrian, Ordovician, Silurian and Devonian problems common to the Armorican Massif and the Iberian Peninsula. The newsletter deals with all problems of stratigraphy, palaeontology and sedimentology. Its most important purpose is to exchange information and ideas on palaeogeographic reconstructions and stratigraphic correlations between the Armorican Massif and the Iberian Peninsula, including the western Pyrenees. A large part is devoted to the problems of the Silurian- Devonian boundary.

The first issue of the N.I.A. appeared in October 1974, the second in February 1975. The usual format, duplicated and stapled on A4 paper (3040 pp.), con- sists of: (1) editorial notes, (2) reports of meetings held and planned, (3) contributions from all workers ar- ranged according to stratigraphic interest and alpha- betic order of authors’ names, and (4) information about collections, publications, unpublished theses and maps, etc.

Contributors are at present French, Spanish, Dutch, German and English. 50 copies of the second issue were duplicated. The next one (No. 3) will be about 70 copies.

The newsletter accepts pre-publication announce- ments of basic work that is going to be formally

LETHAIA NEWSLETTER PRESENTATIONS

LETHAIA 9 (1976) 148

Nouvelles Ib6ro-Armoricaines PATRICK R. RACHEBOEUF

published, but is not in itself a forum for final re- porting on results. This speeds up the amalgamation of information from other projects in the group and makes cooperation in research easier. Moreover, the informal non-publication state of the Bulletin should permit and encourage the airing of ideas and concepts. The first effect on the group behind the newsletter was a field meeting organized last September in Aragon and Guadarrama. For the future, field meetings are planned for the Cantabrian Mountains and the Armori- can Massif.

The Editor invites contributors to send their contri- butions (in French, Spanish or English) by 1st January each year. It is planned to edit and issue the newsletter before the end of the spring. Nouvelles IbPro-Armori- caines is an enterprise with no budget, so the news- letter can be sent only to persons active in the research group and to persons who otherwise report a profes- sional or institutional interest in it.

All contributions should be addressed to Dr. Patrick R. Racheboeuf, C.N.R.S., Universite de Bretagne Oc- cidentale, Laboratoire de PalContologie, 6 Avenue Le Gorgeu, 29283 BREST CCdex, France.

Members advising newcomers are requested to in- form the Editor of their addresses and interests. They will be included in the following newsletter and receive a copy.