298 PROCEEDINGS OP THE ACADEMY OP 



68. Sph. rtigosum, Dkr. 



Cyclas rufjosa, Dkr. Dkr. & Meyer, Paleont. 1, 38, pi. 6, f. 15, 16, a-b, 

 1846. 

 Hab. Germany, (fossil, j 



69. Sph. Ryckholtii, Normd. Bgt. Amen. 1, p. 6. 1853. Normd. Cycl. 



3. 1854. 

 Cyclas Ryckholtii, Normd. Cycl. 7, f. 5, 6, 1844. 

 Sph. strictum, Normd. Cycl. 3, 1854. 

 Hab. France. 



70. Sph. Rylliense, Boissy. 



Cyclas Rylliensis, Boissy. Bull. Soc. Geol. Fr. 2d ser. iv. 178, 1846. 



Mem. Soc. Geol. Fr. 2d ser. 3, 270, pi. v. f. 5, a-c, 1848. 

 Pisid. Rylliense, Bgt. Sph. 52, 1854. 

 Hab. France, (fossil.) 

 Cycl. sabulicola, Kryn. Mss. (Bgt. Lph. 13. 1854. Is Sph. rivi- 



c o 1 a, Lam. 

 Cycl. Sa rr at ogea, Lam. Lam. v. 560. 1818. Is Sph. sulcatum, 

 Lam. 



71. Sph. Scald i an um, Normd. Cycl. 1. 1854. 



Cyclus Scaldiana, Normd. Cycl. 5, f. 1, 2, 1844. 



Sph. corneum, Scop. Bgt. Amen. 1, p. 6, 1854. 



S. citrinum, Normd. Cycl. 1, 1854. 

 Hab. France. 



Cycl. Sebetia, DaCosta. Cat. Syst. Tert. Sicil. pi. 2, f. 6. 1829. Is 

 Bornia corbuloides, Phil. 



72. Sph. securis, Pr. Ads. Rec. Gen. ii. 450. 1858. 



Cyclas securis, Pr. Bost. Proc. iv. 160, 1851. Stimp. N. E. Moll. 16, 

 1851. An. N. Y. Lye. v. 218, pi. vi., 1852. Bost. Proc. iv. 276, 1852. 

 Jay, Cat. iv. ed. 466, 1852. Hartman, Cat. 1853. Bgt. Amen. 1, p. 9, 

 1853. Lewis, Bost. Proc. v. 122, 1855. 

 C. crocea, Lewis. Loc. sup. cit. v. 25, 1854 ; vi. 2, 1856. 

 Hab. N. America. 



73. Sph. seminullum, Reuss. Bgt. Sph. 47. 1854. 



Cycl. seminulla, Reuss. Dkr. & Meyer Paleont. 2, 42, pi. iv. f. 15, 1852. 



Hab. Europe (fossil.) 



Cycl. semis triata, d'Orb. Prod. 3, 19. 1852. Is Cyrena s e mist ri- 

 at a, Desh. 



Sph. simile, Say. Ads. Rec. Gen. ii. 450. 1818. Is Sph. sulcatum, 

 Lam. 



Sph. simplex, Pr. Ads. Rec. Gen. ii. 450. 1858. Is Sph. acumi- 

 natum, Pr. 



Cycl. s i r e n a, d'Orb. Prod. 2, 323. 1850. Is Cyrena s i r e n a, Pr. 



Cycl. solida, DeKay. 220, pi. 25, f. 265. 1842. Is Sph. su lcat um, 

 Lam. 



74. Sph. s o 1 i d u m, Normd. Bgt. Amen. 1, p. 6, 1853. Normd. Cycl. 2, 1854. 



Cycl. solida, Normd. Cycl. 6, f. 3-4. 1844. 

 Hab. France. 



75. Sph. s o 1 i d u 1 u m, Pr. 



Cycl. solidula, Pr. Bost. Proc. iv. 158, 1851. Loc. sup. cit. iv. 282, 

 1852. Jay, Cat. iv. ed. 466, 1852. Bgt. Amen. 1, p. 9, 1853. Lewis, 

 Bost. Proc. v. 122, 1855. 

 C. distorta, Pr. loc. sup. cit. iv. 158, 1851. Loc. sup. cit. iv. 285, 



1852. Bgt. Amen. 1, p. 7, 1853. Lewis, Bost. Proc. v. 122, 1855. 

 Sph. distortum, Pr. Ads. Rec. Gen. ii. 450, 1858. 

 Hab. N. America. 



[June, 



