NATURAL SCIENCES OP PHILADELPHIA. 297 



Cycl. proserpina, d'Orb. Prod. 2, 323. 1850. Is Cyrena p r o s e r- 

 pin a, Pr. 



62. Sph. proximum, Alder ? Ads. Rec. Gen. ii. 450. 1858. 

 Hab? (Not described.) 



Cycl. pulchella, Hani. Proc. Spec. 1, 91. 1843. Is Pisid. caser- 

 tanum, Bgt. 



63. Sph. pulchellum, d'Orb. 



Cyclas pulchella, d'Orb. Guer. Mag. Zool. 1835. Voy. Amer. Sept. 



568, pi. 83, f. 8-10. 1844. 

 Musculium pulchellum, d'Orb. Ads. Rec. Gen. ii. 452. 1858. 

 Pisum pulchellum, d'Orb. Loc. sup. cit. ii. 560. 1858. 

 Hab. South America. 

 Cycl. pule her, Sowb. Min. Conch, vi. 51, pi. 527, f. 1. 1829. Is Cyrena 



pulchra, Morris. 

 Cycl. pus ilia, Turton. Man. 16, pi. 1, f. 7. 1831. Is Pisid. pusil- 

 lum, Jen. 



64. Sph. pygmeum, C. B. Adams. 



Cyclas pygmea, C. B. Adams. Contr. Conch. 44, 1849. Jay, Cat. iv. ed. 

 465, 1852. Bgt. Amen. 1, p. 9, 53, 1853. 



Musculium pygmeum, C. B. Ads. Ads. Rec. Gen. ii. 452, 1858. 



Pisum pygmeum, C. B. Ads. Loc. sup. cit. ii. 660, 1858. 

 Hab. W. Indies. 

 Cycl. r a d i a t a, Blainv. 2232. 1828. Is Galatea r a d i a t a, Lam. 



65. Sph. rhomboideum, Say. Ads. Rec. Gen. ii. 450. 1858. 



Cyclas rhomboidea, Say. Ac. N. S. Phil. II. ii. 380, 1822. Fer. Mag. 

 Zool. 1835. Dekay, 224, pi. 25, f. 263, 1842. C. B. Ads. Vt. 18, 

 1842. Linsl. Amer. II. 48, 276, 1845. C. B. Ads. Cat. 30, 1847. 

 Jay, Cat. iv. ed. 32, 1850. Stimps. N. C. Moll. 16, 1851. Pr. Bost. 

 Proc. iv. 272, 1852. Pr. An. N. Y. Lye. vi. 66, pi. 1, f. 4 a, b, 1853. 

 Bgt. Amen. 1, p. 9. 1853. 

 Cyclas cornea, Lam. var. 3. Lam. v. 558, 1818. Lam. (Desli. ed.) vi. 



268, 1835. 

 Cyclas elegans, Ads. Bost. II. 3, 330, pi. 3, f. 11, 1840. Gould. Rept. 

 74, f. 55, 1841. Dekay, 224, 1842. C. B. Ads. Vt. 18, 1842. Linsl. 

 Amer. II. 48, 276, 1845. C. B. Ads. Cat. 30, 1847. Jay, Cat. iv. ed. 

 32, 1850. Pr. Bost. Proc. iv. 165, 1851. Stimps. N. E. Moll. 16, 

 1851. Bgt. Amen. 1, p. 8. 1853. Lewis Bost. Proc. v. 122, 1855. 

 Sph. elegans, C. B. Adams. Ads. Rec. Gen. ii. 450, 1858. 

 Hab. N. America. 



Cycl. rivalis, Drap. Hist. Moll. 129, pi. x. f. 4, 5. 1805. Is. Sph. 

 corneum, Scop. 



66. Sph. rivicola, Lam. Bgt. Amen. 1, p. 6, 1853. 



Chama albida, d'Arg. Conch. 2d pt. pi. 31, p. 368, 374, 1742. 

 Tellina cornea, (pars.) Schrot. 189, pi. iv. f. 4, 1779. 

 Cyclas cornea, (pars.) Draps. Tabl. Moll. 105, var. a, 1801. 

 C. rivicola, Lam. Lam. v. 558, 1818. 

 G. cequata, Sheph. Mss. 1840. 



Sph. riviculum, Leach. Morch. Cat. Conch, etc. fase. 2, p. 30, 1853. 

 Cycl. sabidieola, Kryn. Mss. (Bgt. Sph. 13, 1854.) 

 Hab. Europe. 



67. Sph. r osaceum, Pr. Ads. Rec. Gen. ii. 450. 1858. 



Cyclas rosacea, Pr. Bost. Proc. iv. 155, 1851. Loc. sup. cit. iv. 277. 

 1852. 

 Hab. N. America. 

 Cycl. R o u y a n a, d'Orb. Prod. 2, 381. 1850. Is Cyrena Ro uy a na, Bgt. 



I860.] 



