30 



— parietal lam. i, i columellar, i basal [sometimes 



wantin<^] 2 palatals; color horn to deep— or 

 greenish horn; sh. rather thin; alt. 1.6, diam. i 

 mill. ventricosa, Mse. 



var. clator: sh. stronger, larger, ovate conic, 

 chestnut colored, alwaj's with a strong basal. 



20. Ferussacia, Risso 



[Subg. Cionella | lubrica, Mull. 



Note: — The name subcylindrica Lin., commonly used, is not applic- 

 able, as L.'s description evidently covers a different sp. 



21. Succinea, Drap. 



Afote:—\\. is diffucult to characterize the species with short diagnoses. 

 Besides, the writer had not good specimens of all sp. at hand. He 

 should be glad to receive, from all parts of the state, Succinea?, a part 

 of them in alcohol, or rather living. In older to have mature specimens, 

 they should be collected at different times of the season. -^Other sp. than 

 these may be found. 



1 Alt. 10 mill, or less, suture deep 2 



— alt. 13 mill, or more 3 



2 aperture wide, rather rounded; spire comparatively 



high, conic; color straw to greenish, to amber, or 

 rosy; alt. 5 to 10, diam. 3 to 6 mill. avara. Say 



— aperture narrow-ovate; sh. very s^^m metrical in form, 



very thin, of clear amber color; alt. 7-5, diam. 3 mill. 



aurea, Lea 



3 alt. 18 [up to 25 I diam. about 12 mill.; ap. rounded 



above, about -/-^ the alt. of the sh.; color greenish 



to amber colored to grayish. obliqua, Say 



— alt. not exceeding 15 mill.; aperture pointed above, 



comparatively very high | spire short] and much 

 widest below; columella very arcuate; color 

 pale horn to roseate ovalis, Gld. 



A^ote: — S. re/itsa. Lea; alt. 17.5, diam. 7.5 mill.; aperture considerably 

 dilated and retracted in its inferior part; and. 6". ///gjvV/i-/ Bland: alt. 15, 

 diam. 7 mill.; last whorl less convex, the aperture more angular above, 

 the columella less arcuate and usually with a denticle above, — these two 

 are regarded as species by some, as varieties of S. ovalis Gld. by other 

 cochologists. 



