132 PEECY SLA DEN TRUST EXPEDITION. 



443. Crista pectinata (L.). 

 Loc. Seychelles ; Praslin I. 



Cliagos Archipelago : Diego Garcia, Barachois Maurice. 



444. Crista gihhia (Lam.). 



Loc. Chagos Arcliipelago : Diego Garcia, Barachois Maurice. 



445. Lioconchu picta (Lam.). 



Loc. Cargarlos Carajos : Station B 9, 30 fathoms, broken shell, with coral-lumps. 

 Seychelles : Station P 2, 31 fatlioms, on coral, sand, and Lithothamnia-vuhhle. 



446. Callista amirantium, sp, nov. (Plate 4. fig. 12.) 



C. testa oonvexa, lajvi, tenui, nitida, asquivalvi, insequilaterali, hie illic pallide et 

 leniter bi- vel tri-rufo-radiata, aliter unicolore, undique concentrice arete costulata ; 

 umbonil)ns prominnlis, contiguis ; lunula parva ; margine dorsali posticc leniter 

 declivi, ventrali fere rotundato, antice brevi ; pagina interna albo-straminea, laevi, 

 margine laevigata ; cardine normali. 

 Loc. Amirantes : Station E 9, 34 fathoms, among Polyzoa and shell-rubble. 

 Alt. IS, lat. 21, diam. 12 mm. 



Several examples of a moderate-sized, convex, light Callista, smoothish, fairly 

 shining, evenly concentrically closely ribbed, the ribs narrow and close, the surface jialest 

 yellow, ornamented obscurely with faint reddish rays, which become obsolete in the 

 centre of the shell. The umboes are contiguous and prominent, the lunule small, hinge 

 that of a normal Callista, while within the surface is whitish straw-colour and very 

 smooth. 



447. Callista costata (Chemn.). 

 Loc. Cargados Carajos : 30 fathoms. 



448. Caryatis Iceta (Chemn.). 



Loc. Amirantes : Station E 16, 30 fathoms, Lithothamnia-vahyAQ. 

 Not quite typical in form, but probably refei-alile to this species. 



449. Venus (Chione) lamarckii, Gray. 



Loc. Cargados Carajos : Stations B 7, B 8, B 9, 30 fathoms, weed, broken shell, 

 and coral bottom ; B 15, 30-33 fatlioms, sandy ; B 17, 30 fathoms, shell- 

 rubble. 

 Amirantes : Station E 8, 33 fathoms, hard sand. 



450. Venus [Chione) marica, L. 



Loc. Providence I. : Station D 1, 39 fathoms, dead and encrusted coral bottom. 



