198 On the Relations of Certain 



XV. — On the Relations of Certain Genera of Terrestrial 

 Mollusca of or related to^ the Sub-family Succininae^ 

 with JSfotes on the Lingual Dentition of Succinea apjpend- 

 iculata Ifr. 



BY THOMAS BLAND AND W. G. BINNEY. 



Read October 7, 1872. 

 [Reprinted from the Annals of the Lyceum of Natural History, N. Y.. Vol. x, Oct., 1872.] 



The receipt from Governor Rawson of specimens pre- 

 served in alcohol of Succinea ajppendicidata and Omalonyx 

 unguis Fer, collected in and sent to him from Guadelonpe, 

 by M. Schramm, has afforded us the opportunity of studying 

 their dentition and induced us to examine the relations 

 of certain genera which have been placed in the sub-family 

 Succininod. 



Albers (2nd ed.) in group E, Succinea, has the following 

 genera, viz., Simpidopsis Beck, and Succinea Drap., the 

 latter divided into four sections, viz., Amphibulima, Suc- 

 cinea, Brachyspira and Omalonyx. He describes the jaw 

 and refers to the lingual teeth in the following terms : — 



Jaw arcuate, its convex margin extended into an almost 

 quadrate plate ; its concave margin striate or ribbed, with a 

 short middle projection. Teeth of the lingual membrane as 

 previously described {i. e., tricuspid or bicuspid as in Hel- 

 icea, etc.). 



Simpulopsis Beck. 



Beck (Index, p. 100) adopted this genus, but by name 

 only. Shuttleworth (Bern. Mitt., 1854, p. 55) thus charac- 

 terizes the animal : — 



" Animal heliciforrae, testa omnino inclusum, pede lato subtus trans- 

 verse plicato : pallium exappeudiculatum. 



" Maxilla fere formam ferri equini habet, utroque latere dilatato-rotun- 

 dato, medio autem angustata, costis 12 validis permunita, quarum 6 ap- 

 proximatae in parte angusta mediana, et in utroque latere 3 majores, 

 magis remotse. Fapillse in laminam liugualem in seriebus obliquis ordi- 



