157 



36. S. rhomboideum, Say. 



Cyclas cornea. Lam., var. 3, An. v. 558, 1818. 



Cyclas rhomboidea, Say, J. Ac. N. S. Phila. ii, 380, 1822. 



Cyclas elegans, C. B. Adams, J. N. H. Bost. iii, 330, pi. iii 



f. 11, 1840. Gould, Invert. 74, f. 55, 1841. N. H N 



Y. v, 224, 1843. 

 Cyclas rhomboidea, Say, N. H. N. Y. v, 224, pi. xxv, f. 263 



1843. Ann. Lye. N. H. N. Y. vi, 66, pi. 1, f.4, 1853. 

 S. rhomboideum, Say, Brit. Mus. Cat. Conchif. 266, 1854. 

 S. elegans, C. B. Adams, loc. sup. cit. 270, 1854. 

 S. rhomboideum, Say, Prime Cat. Corb. 9, 1863. Smith. Inst. 



Misc. Coll., Prime Monog. Corb. 39, f. 31, 1865. 



U. S. of America. 



37. S. rivicola, Lamarck. 



Chama albida, d'Argenville, Hist. Nat. Lithol. Conch. 368, 



pi. xxxi, f. 9, 1742. 

 Tellina cornea (pars), Schroter, Fluss. Conch. 189, pi. iv, f. 



4, 1779. 

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



1801. 



Cyclas rivieola, Lamarck, An. v, 558, 1818. 

 Cyclas sabulicola, Krynicki, in litt. 183 

 Cyclas cequata, junior, Sheppard, in litt. 1840. 

 S. riviculum, Leach, Morch. Cat. Conch. 30, 1853. 

 S. rivicola, Lamarck, Rev. Mag. Zool. 345, 1853. Mem. Soc. 



Sc. Phys. et Nat. Bord. i, 1854. Brit. Mus. Cat. Conchif. 



261. 1854. Prime Cat. Corb. 12, 1863. Europe. 



38. S. rosaceum, Prime. 



Cyclas rosacea, Prime, Proc. Soc. N. H. Bost. iv, 155, 1851. 

 S. rosaceum, Prime, Brit. Mus. Cat. Conchif. 270, 1854. 



Prime, Cat. Corb. 11, 1863. Smith. Inst. Misc. Coll., 



Prime Monog. Corb. 50, f. 48, 1865. 



Schuylkill River, U. S. of America. 



39. S. Ryckholtii, Normand. 



Cyclas Ryckholtii, Normand, Not. Cycl. Valenc. 7, f. 5, 6, 



1844. 



S. Ryckholtii, Normand, Rev. Mag. Zool. 345, 1853. 

 S. strictum, Normand, Cycl. Ddpt. Nord. 3, 1854. 

 S. Ryckholtii, Normand, Prime Cat. Corb. 12, 1863. France. 



40. S. Scaldianum, Normand. 



Cyclas Scaldiana, Normand, Not. Cycl. Valenc. 5, f. 1, 2, 



1844. 



8. corneum (pars), Bourguignat, Rev. Mag. Zool. 345, 1853. 

 S. citrinum^ Normand, Cycl. Dept. Nord. 1, 1854. 



