REPORT ON THE LAM ELLIBRANCHIATA. 285 



This species, which was originally described from Braziliuu specimens, will, I believe, 

 include several others from the Caribljean Sea, namely, Avicula Jlahellum, Eeeve, 

 Avicula chamoides, of the same author, and apparently the young of the preceding, 

 Avicula hovrida of Dunker, Avicida cda-perdicis of Eeeve, and possibly one or two 

 more. 



Avicula [Meleagrina) smaragdina, Eeeve. 



Avicula smaragih'na, Reeve, Concli. Icon., vol. x. pi. xii. fig. 4.5. 

 Avicula smaragdina, Smith, Eeport "Alert" Coll., p. 113. 



Habitat. — Off Cape York, in 3 to 12 fathoms. 



This species w^as collected by Dr. Coppinger of H.M.S. "Alert" on the coast of North- 

 east Queensland, and was presumed by Eeeve to have come from the Moluccas. 



Perna, Bruguiere. 

 Perna samoensis, Baird. 



Pcrna (Isof/iwmon) samoeiii<ii<, LairJ, in Urenchley's Cruise of the "Curajoa," p. 454, pi. xlii. fig. 8. 



Habitat. — On the reefs at Samboangan, Philippine Islands, in 10 fathoms; also on the 

 reefs at Honolulu, Sandwich Islands. 



This species was descriljed from specimens collected ai Tutuila, one of the Samoa 

 Islands, and other examples of it from the Keeling Islands in the Indian Ocean are in the 

 collection of the British Museum. It is readily recognised by the radiating brown lines 

 which run l^etu-ecn and not upon the slightly raised ridges as stated by Baird. These 

 lines, which cannot be called purple, exist only on the convex valve. The form of this 

 shell is very variable, some of the Keeling specimens being extraordinaril}- produced into 

 a wing-like projection behind. 



Perna vitrea, Eeeve. 



Perna vitrea, Reeve, Conch. Icon., vol. xi. pi. ii. fig. 10. 



Habitat. — Hilo, Sandwich Islands. 



Eeeve gives the Eed Sea as the locality of this species, but I should state that the 

 specimens in Cuming's collection are marked with the locality " Sandwich Islands.'"' The 

 description of the colour of this shell in the Conchologia Iconica {" of a shining, dark, 

 chestnut-red colour") does not well apply either to the types or the Challenger specimens. 

 The figure, however, is more correct in this respect, the pale zones being, however, a little 

 exaggerated. At a more mature age than the shell depicted, the posterior end becomes 

 somewhat wini:red. 



