72 



THREE CRUISES OF THE " BLAKE 



Dalli (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. 290. — Pecten phrygium. \ . 



Fig. 298. — Pecten (Amnsium) Dalli. 1. 



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

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



Fig. 300. 



Fiff. 301. 



Cetoconcha bulla. ^. 



Fig. 302. — Cetoconcha elon- 

 gata. \. 



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 eytherea. Ij^. 



Fig. 304. — Cardium peramabilis. ^. 



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



