REPORT ON THE LAMELLIBRANCHIATA. 171 



gigas) has never been satis&ctorily sliowu. In tliose large shells the lamellae become 

 worn down and much incrusted with coralline growth, so that it is impossible to know 

 what has been the style of ornamentation when young. I should not l)e surprised 

 if Tridacna squamosa or Tridacna rudis should prove to be the eaxdy stages of this 

 colossal form. 



Family C H A M i D ^. 



Chama, Linne. 

 Chama gryphoides, Linne. 



Chama gryphoides, Linn., part. Syst. Nat., ed. 12, p. 11.39. 



Chama gryphoides, Poli, Test., vol. ii. p. 172 ; Atlas, pi. xxiii. figs. 3, 4, 20. 



Chama gryphoides, PhOippi, Ennm., vol. i. p. 68. 



Chama gryphoides, Weinkauff, Concli. Mittelin., vol. ii. p. 150. 



Habitat. — Off Tenerife, Canary Islands, in 70 fathoms ; and Station 75, off Fayal, 

 Azores, at a depth of 450 fathoms. 



This species is found in several parts of the Mediterranean, and probably ranges even 

 farther south than the Canary Islands; indeed Krauss (Siidafrik. Moll., p. 19) has 

 already recorded specimens collected on the coast of Natal which he con.sidered belonged 

 to this species. It has also been found fossil in several places {vide Weinkauff, op. 

 cit., supra). 



Chama hrassica, Reeve. 



Chama hrassica, Reove, Conch. Icon., vol. iv. pi. vi. fig. .31. 

 Habitat. — Reefs off Tongatabu (Challenger); Philippine Islands (Cuming). 



The upper of the brown rays represented in the above figure occupies a distinct 

 depression. The interior of this species is for the most part white, tinged and spotted 

 more or less with purple-pink upon the margin, which is smooth and not crenulated as in 

 many other species. 



Chama sidphurea, Reeve. 



Chama sidphurea. Reeve, Conch. Icon., vol. iv. pi. iii. fig. 14. 



Habitat. — Station 187, near Cape York, North Australia, in G fathoms (Challenger); 

 Island of Mindoro, Philippines (Cuming). 



