NATURAL SCIENCES OF PHILADELPHIA, 201 



Orhicula (s. g. Discina) norvegica^ Blainv. Diet. Sci. Nat. 



xxxii. p 304. 1824. Man. Mai. p. 515, pi. Iv. fig. 5. 1825. 

 Orbicula (s. g. Discina) ostreoides^ I^aiig? Man. Moll. p. 263. 



1829. 

 Orbicula osfreoides, Reeve, Conch. Icon. No. 7, pi. i. fig. T 



a-b. 1862. 

 Discina ostreoides, Lam. Hist. An. s, Yert. Ed. i. vi. p. 23T. 



1819. (Type ; no descr.) Ed. ii. vii. p. 297. 1836. Thos. 



Brown. Conch. Textb. Ed. v. p. 108, pi. xiv. fig. 8. 1839. 



Macgillivray, lb. Ed. ix. p. 124. 

 Not Discina ostreoides, Tnrton, Dith. Brit. p. 238. 1822. 



(= Crania anomala.) 

 Discina striata, Dall, Bull, Mas. Corap. Zool. iii. No. 1, p. 



39. 1871. Am. Journ. Conch, vii. p. 75. 1871. 



Northwest Coast of Africa- 



Subgenus Discinisca, Dall. 



Discinisca, Dall, Bull. Mus. Corap. Zool. 1. c. p. 37. May, 1871. 

 Am. Journ. Conch, vii. p. 74. 1871. 



1. Discinisca antillarum, D'Oi*bigny. 



Orbicula antillarum, D'Orb. Moll. Cuba, p. 368, pi. xxviii. 



figs. 34-36. 1853. Rve. Conch. Icon. pi. i. fig. 2. 1862. 

 Discinisca? antillarum, Dall, Bull. Mus. Comp. Zool.l. c. p. 



42. Am. Journ. Conch, vii. p. 77. 1871. 



Cuba, Ilartinique 



2. Discinisca (?) atlantica, Jeffreys MSS. 



Deep Water, N. E. Atlantic. 



3. Discinisca Cumingi, Broderip. 



Orbicula Cumingi, P. Z. S. p. 124. 1833. Reeve, Conch. 



Icon. pi. i. fig. 6. 

 Orbicula strigata, Brod. P. Z. S. 1833. 

 Discinisca Cumingi, Dall, Bull. 1. c. p. 42. Am. Journ. 



Conch, vii. p. 77. 1871. 



Gape St. Lucas to Panama. 



4. Discinisca l^vis, Sby. 



Orbicula Isevis, Sby. Trans. Lin. Soc. xiii. p. 468, pi. xxvi. 



f. 1 a-d. 1822. Rve. Conch. Icon. pi. i. fig. 4 a-b. 1862. 

 Discinisca laevis, Dall, Bull. 1. c. p. 42. Am. Journ. Conch. 



vii. p. 76. 1871. 



Coast of Peru and Chili. 

 14 



