278 Mr. E. A. Smith on the Genus Splienia. 



Seventeen recent species have been described as belonging 

 to this genus, as follows : — 



1. Sphema Binghami, Turton. 1822. 



2. Swainsoni, Turton. 1822. 



3. decussata (Mont.), Turton. 1822. 



4. • californicaj Conrad. 1837. 



5. Cleryana^ d'Orbigny. 1846. 



6. ■ ornatissima, d'Orbigny. 1846. 



7. alternata, d'Orbigny. 1846, 



8. RUp'pelln, A. Adams. 1850. 



9. princeps^ A. Adams. 1850. 



10. eJlijMca^ A. Adams. 1850. 



11. decurtata, A. Adams. 1850. 



12. pkilippinarum, A. Adams. 1850. 



13. fragiiis, Carpenter. 1857. 



14. bilirata, Gabb. 1861. 



15. ovoidea, Carpenter. 1865. 



16. 2?eri;e?\sa, Blanford. 1867. 



17. paci/ica, Folin. 1867. 



Of the above, no. 2 has been shown to be the young of 

 3Jya truncafa, no. 3 equals Petricola Uthophaga^ nos. 5, 6, and 

 7 are species of Cusptdaria, nos. 4, 9, 10, 11, and 12 have 

 since been removed to Conrad's genus Cryptomya.^ and no. 14 

 appears to be a young Saxicava, as suggested by Carpenter*; 

 this, however, is uncertain until the type, if preserved, has 

 been reexamined. 



The following species — decussata^ Deshayes, semistri'ata, 

 Hanley, and mindorensis, Adams and Reeve — originally 

 described by their respective authors as Myce, were subse- 

 quently referred to Sphenia by A. Adams, but have since 

 been definitely located in Cryptomya. In the Paetel Cata- 

 logue, 1890, iii. pp. 20, 21, Rupicola distorta^ Montagu 

 { = concenirica, Fleur. de Bellev.), is erroneously classed with 

 Sphenia. The shells of nearly all the species are very similar 

 and liable to great variation in form, arising from the locality 

 in which they live. The following are the species which 

 belong to Sphenia as now understood. 



Genus Sphenia, Turton. 



1. Sphenia Binghami, Turton. (PI. XV. A, fig. 1.) B.M.f 



Sjiluma Binghami, Turton, Conch. Ins. Brit. p. 36 ; Fisclier, Man. 

 Conch, p. 1122, pi. xxxiii. fig. 4. 



* Moll. West. North America, 1872, p. 118. 



t Species marked B.]M. are in the British Museum. 



