198 On the Relalions of Certain 



XV. — On the Helations of Certain Genera of Terrestrial 

 MoJlusca of, or related to, the Subfamily Succininoe, 

 ivilJi JSTotes on the Lingual Dentition of Succinea append- 

 icidata Pfr. 



Br THOMAS BLAMD AND W. G. BINNEY. 



Head October 7, 1872. 



The receipt from Governor Rawsoii of S})ecimeus pre- 

 served in iilcohol of Succinea appendicidata and Omalonyx 

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

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

 their dentition and induced us to examine the relations 

 of certain genera ^vhich have been placed in tlie sub-family 

 Succininm. 



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

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

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

 cinea, Bracliysjnra and Onudonyx. He describes the jaw 

 and refers to the limrual 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 (^. e., tricuspid or bicuspid as in Ilel- 

 icea, etc.). 



SBBMpiaSoiJSiS Bl'XK. 



Beck (Index, p. 100) adopted this genus, ]>ut by name 

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

 terizes the animal : — 



"Animal heliciformo, testa omuiuo iuclusum, pede lato subtiis trans- 

 verse plicato : pallium exappeiicliculatum. 



"Maxilla fere formam ferri equiui habet, utroque latere clilatato-rotun- 

 dato, medio autem angustata, costis 12 validis permunita, qiiarum G ap- 

 proximata3 in parte angusta mediana, et in utroque latere 3 majores, 

 magis reraota3. PapilliB in laminam lingualem in seriebus obliquis ordi- 



