102 List of the Known Sjpecies of 



— ruhellum Pr. Bost. Proc. IV. 163, 1851, is P. tenellum Gould. ' 



— rubrum Lewis MSS. 1855, is P. abdituin Hald. 



— Rylliense Bgt. Sph. 52, 1854, is SpbEErium Rylliense Boissy. 



85. semen Wlenke Moll. N. Holld. 40, 1843. 

 Hah. Oceanica. 



— simiatum Bgt. Jl. Conch. 421, 1851, is P. casertanum Bgt. 



— splendidum Parr. MSS. is a Nucula. 



— Stahileii Schmidt MSS. is P. casertanum Bgt. 



36. 6teenl>5sc!ii Morch Gronld. 19, 1857. 



Cyclas Steenhuchi Moll. Ind. Moll. Grl. 20, 1842. 

 Ilab. Greenland. 



37. supinum iSchiatidt Zeit. Malak. 119, 1850. 

 Hob. Germ. 



— sulcatum Parr. MSS. is P. amnicum Jen. 



38. teneiauiii Gonid Ag. L. Sup. 245, 1848.— Best. Jl. VI. 



361, pi. XII. f. 5-7, 1852. 

 Pisid. ruhellum Pr. Bost. Proc. IV. 163, 1851. 

 Hob. ]Sr. Amer. 



— tetragonum Norm. Cycl. 5, 1854, is P. GaEsiesianum Dup. 



— thermale Dup. extram. Gall. test. No. 238, 1849, is P. casertanum 



Bgt. 



39. variabile Pr. Bost. Proc. IV. 163, 1851.— Jay Cat.4 edit. 



466, 1852.— Bost. Jl. VI. 351, pi. XI. f. 7-9, 1852.— Bgt. 

 Amen. 1, p. 53, 1853. — Hartm. Cat. 1853. — Lewis Bost. Proc. 

 VI. 2, 1856. 

 Pisid grande Whitt. MSS. 1855. 

 Hob. N. Amer. 



— Veatleyii Petit Jl. Conch. 421, 1851, is Sphserium maculatum. 



Morel et. 



40. veiltricoSMin Pr. Bost. Proc. IV. 68, 1851.— loc. sup. cit. 



IV. 165, 1851.— Stimp. N. E. Moll. 16, 1851.— Jay Cat. 4 

 edit. 466, 1852.— Girard Biblio. Amer. 53, 1852.— Bgt. Amen 

 1, p. 53, 1853.— Lewis Bost. Proc. VL 2, 1856. 

 Hah. N. Amer. 



41. Virginicwm Bgt. Amen. 1, p. 53, 1853. 

 Tellina Virginica Gml. 3236, pi. CLIX. f. 15, 1788. 



