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 rJiomboidea, 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. Conehif. 266, 1854. 

 tS. elegans, C. B. Adams, loc. sup. eit. 270, 1854. 

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



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



U. iS. of America. 



37. S. rivicola, Lamarck. 



Chama albida, d'Argenville, Hist. Nat. Litbol. 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. Conehif. 



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



38. S. rosaceum, Prime. 



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

 8. rosaceum, Prime, Brit. Mus. Cat. Conehif. 270, 1854. 



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



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



Schuylkill River, TJ. 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. 

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



40. S. Scaldianum, Normand. 



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

 1844. ' • ' ' 



S. eoriieum (pars), Bourguignat, Rev. Mag. Zool. 345, 1853. 

 8. citrinum, Normand, Cycl. Dept. Nord. 1, 1854. 



