424 Reviews—M. Cossmann—Oligocene Fauna of Etampes. 
of Diplograptus and Climacograptus, and proceed to discuss the 
madreporoid corals Lichenaria Streptelasmide, Poritide, etc., and 
figure and describe Aulopora trentonensis, W. and §.,' the only 
Lower Silurian auloporoid known. AGNres CRANE. 
IIJ.—Reviston or tHe Fauna or tHe Marine OLIGOCENE OF THE 
Environs oF Etampes. By M. Cossmann. 
REvisIon SOMMAIRE DE LA FAUNE DU TERRAIN OLicocENE Marin 
AUX ENVIRONS D’ETamprs. Par M. Cossmann (Journ. de Conch. 
tome Xxxil. pp. 330, et sqq.). 
HIS descriptive Catalogue of the marine mollusca of the Oligocene 
beds to the south of Paris is a continuation of the author’s 
work published in 1891. The whole is practically a revision of 
MM. Cossmann and Lambert’s larger work! relating to the fossils 
of the same area; and had become necessary in view of the light 
thrown on the classification and nomenclature of Lower Tertiary 
fossils during the progress of M. Cossmann’s Catalogue of the 
Kocene fossils of the Paris basin. 
The bivalves having been disposed of in the first part, published in 
1891, the section under review comprises only the Scaphopoda and 
Gasteropoda. Commencing with Dentaliuwm, the author accepts the 
view of Prof. von Koenen, that the forms hitherto referred to Hébert’s 
D. acutum differ from that species, and D. Novaki, von Keen., is 
substituted therefor. 
Chiton Terquemi, Desh., is replaced by C. Etrechyensis, de Rocheb., 
the former name haying been pre-occupied. M. de Rochebrune 
placed this species in the genus Tonicia, but, as M. Cossmann truly 
remarks, it is impossible to classify these fossils —which occur, as 
a rule, in single valves only, and deprived of many characteristic 
parts—in the same manner as their living representatives. Figures 
are given of C. Poirieri, de Rocheb., of which the anterior valve 
is unknown. 
In his catalogue of the Eocene mollusca the author referred to 
the genus Basilissa, Watson, a certain number of shells possessing 
conical striz, slightly perforated, thick peristome, with columella 
inflated and abruptly terminated anteriorly. On second con- 
sideration he is now disposed to include them in Thalotia, a sub- 
genus of Hlenchus. The Trochus subcarinatus, Lamk., of the Paris 
basin Oligocene possesses a columella in every way comparable 
with that of EHlenchus Lehmanni, Menke, of the Australian seas, and 
differs only from that species in not having the lip guttered 
interiorly, which the author regards as an unimportant character. 
The embryo in both species is of the same dimensions, whilst the 
ornamentation of the spire is very similar, and the lip presents the 
same obliquity. We entirely agree with the author that the 
Oligocene shells under discussion are not Basilissa, and that they 
may properly be referred to Thalotia, but some of the thin, fragile 
Eocene forms appear to be identical with Watson’s genus. Five 
1 Mém. Soc. Géol. France, 3° ser. iii. (1884). : 
