24 PROCEEDINGS OP THE ACADEMY OP 



Synonymy of the Species of STREPOMATIDJE, a Family of Fluviatile Kollnsca 



inhabiting North America. 



Part 2. 

 BY GEORGE W. TRYON, JR. 



Goniobasic Section. 

 Genus GONIOBASIS, Lea. 



GoniobaSis, Lea, Proc. Acad. Nat. Sci. p. 262, May, 1862. Journ. Acad. Nat. 



Sci. v. pt. 3, p. 217, March, 1863. Obs. ix. p. 39. 

 Ceriphasia, Swainson, (sp.) H. and A. Adams, Genera i. p. 298, Feb. 1854. 



Chenu, Man. de Conchyl. i. p. 290, 1859. 

 Pachycheilus, Lea, (sp.) H. and A. Adams, Genera i. p. 298, Feb. 1854. 

 Potaduma, Swainson, (sp.) II. and A. Adams, Genera i. p. 299, Feb. 1854. 



Chenu, Man. de Conchyl. i. p. 290, 1859. 

 Elimia, (sp.) H. and A. Adams, Genera i. p. 300, Feb. 1854. Chenu, Man. 



de Conchyl. i. p. 290, 1859. 

 Melasma, (sp.) H. and A. Adams, Genera i. p. 300, Feb. 1854. Chenu, Man. 



de Conchyl. i. p. 292, 1859. 

 Hemisinus, Swainson, (sp.) H. and A. Adams, Genera i. p. 302, Feb. 1854. 

 Juga, (sp.) H. and A. Adams, Genera i. p. 304, Feb. 1854. Chenu, Man. de 



Conchyl. i. p. 293, 1859. 

 Megara, (sp.) H. and A. Adams, Genera i. p. 306, Feb. 1854. Chenu, Man. 



de Conchyl. i. p. 293, 1859. 

 Pleurocera, Rafinesque, Haldeman, Proc. Acad. Nat. Sci. p. 274, 1863. 

 Mclania, (sp.) Auct.* 



Species. 



A. Shell spirally ridged. 



1. G. procissa, Anthony. f 



Melania procissa, Anthony, Ann. Lye. Nat. Hist. N. Y. vi. p. 109, t. 3, f. 9, 

 March, 1854. Binney, Check List, No. 218. Brot, List, p. 59. Reeve, 

 Monog. Melania, sp. 342. 



B. Shell tuberculate or nodulous. 



2. G. g r a t i o s a, Lea. 



Melania gratiosa, Lea, Proc. Acad. Nat. Sci. p, 122, May, 1861. 

 Goniobasis gratiosa, Lea, Jour. Acad. Nat. Sci. v. pt. 3, p. 241, t. 35, f. 43, 

 March, 1863. Obs. ix. p. 63. 



2a. G. la chry m a, Anthony. J 

 Melania lachryma, Anthony, Reeve, Monog. Melania, sp. 473, May, 1S61. 

 Brot, List, p. 32. 



3. G. g i b b e r o s a, Lea. 



Goniobasis gibberosa, Lea, Proc. Acad. Nat. Sci. p. 266, 1862. Jour. Acad. 

 Nat. Sci. v. pt. 3, p. 312, t. 37, f. 155, March, 1863. Obs. ix. p. 134, 

 t. 37, f. 155. 



* Mr. Lea is the first naturalist who has properly defined this genus, and his name Goniobasis 

 must therefore stand, in preference to any of the prior names given to artificial sections by the 

 Messrs. Adams. 



Of course these gentlemen are wrong in including species of this genus in the genera Pachy- 

 chet'ius, Ceriphasia, Potadoma and Hemisinus, which are all intended to embrace very different 

 groups of species. Prof. Haldeman is also mistaken in placing here the Pleurocera of Rafinesque, 

 a genus which undoubtedly = Trypanosoma, Lea. 



f This may be only an elevated form of Anculosa canalifera, Anthony. 



% This species and the preceding {gratiosa) are identical. Both descriptions bear the same date 

 of publication, and I am therefore unable to decide which has priority. 



[Feb. 



