72 



THREE CRUISES OE THE " BLAKE. 



Dallj (Fig. 298), of E. A. Smith, frequently dredged by the 

 " Blake," grows to a considerable size, but is as thin as mica 

 and nearly as transparent; P. phrygium Dall (Fig. 299) is re- 



Fig. 299. — Pecten phrygium. \. 



Fig. 298. — Pecten (Amusium) Dalli. {. 



lated to miocene species, and has a very complicated sculpture. 

 Cetoconcha bulla (Figs. 300, 301) and C. elongata Dall (Fig. 



Fig. 300. Fig. 301. 



Cetoconcha bulla. ?. 



Fig. 302. — Cetoconcha elon- 

 gata. 1 . 



302), two species of a singular new genus, are almost as unsta- 

 ble in their framework as a drop of water. Nuculse are abun- 



Fig. 303. — Tindaria cytherea. 1 ^'. 



Fig. 304. — Cardium peramabilis. ^. 



dant. One of them, Tindaria cytherea (Fig. 303), the finest 



