100 List of the Known Species of 



34. nitidlini Jen. Trans. Camb. Phil. Soc. IV. pt. 2, 304, pi. 



XX. f. 7-8, 1832. 

 Cyclas pusilla Turt. Man. 16, pi. I. f. V, 1831. 



" nitida Hani, (non Migh.) Spec. etc. 1, p. 90, pi. XIV- 

 f. 46, 1843. 

 Pisid. incertum Norm. Cycl. 6, 1854. 

 Hah. Europe. 



— Normandianum Dup. Gas. Agen. 206, 1849, is P. Gassiesianum Dup. 



— 7iotatum Pr. Bost. Jl. VI. 365, pi. XII. f. 20-22, 1852, is P. ab- 



ditum Ilald. 



'25. IVovi JEboraci Pr. Ann. N. Y. Lye. VI. QQ, pi. I. f. 3, 



a. c. 1853. 



Sab. JST. Amer. 



26. IlUCleuni Bg-t. Sph. 51, 1854.— Desh. Inv. Par. 526, pi. 



XXXIV. f. 23-25, 1857. 

 ^Cyclas nuclea Boissy Bull. Soc. Geol. 2d. ser. IV. 178, 1846. — 

 Mem. (do.) 2d ser. III. 270, pi. V. f. 1, 1848. 

 , Hob. France (fossil). 



— ohliquum Pf. Syst. Anord. 124, pi. V. f. 19-20, 1821, is P. amni- 



cum Jen. 



— obscurum Pr. Bost. Proc. IV. 161, 1S51, is P. abditum Hald. 



27. Obtusale Pr Syst. Anord. 125, pi. V. f. 20-21, 1821. 

 Cyclas obtusalis Lam. V. 559, 1818. 



» minima Stud. Verz. 93, 1820. 



« (jihha Aid. Trans. Soc. Northd. 1, pt. 1, p. 41, 1830. 

 Pera gihha Leacb MSS. 1832, 



Pisid. minimum Stud. Mem. Soc. Helv. etc. 1, 25, 1837. 

 Cyclas ovalis Nils. Jen. Trans.^ Camb. Phil. Soc. IV. pt. 2d, 1832. 

 Pisid. ovale Petit Jl. Conch. 421, 1851. 

 Hob. Europe. 



— ovale Petit, Jl. Conch. 421, 1851, is P. obtusale Pf. 



— pallidum Gas. Pisid. 16, pi. I. f. 10, 1855, is P. Henslowianum 



Jen. 



— palustre Porro 122, 1838, is P. amnicum Jen. 



— parasiticum Parr. MSS. is Sphserium ferrugineum Krauss. 



