12 THREE CRUISES OF THE “BLAKE.” 
Dalli (Vig. 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. 1. 
Fig. 208. — Pecten (Amusium) Dalli. 1. 
lated to miocene species, and has a very complicated sculpture. 
Cetoconcha bulla (Figs. 300, 301) and C. elongata Dall (Fig. 
Fig. 302. — Cetoconcha elon- 
gata. 1. 
Fig. 300. Fig. 301. 
Cetoconcha bulla. 2, 
302), two species of a singular new genus, are almost as unsta- 
ble in their framework as a drop of water. Nucule are abun- 
Fig. 303. — Tindaria cytherea. 1,5, 
Fig. 304. — Cardium peramabilis. 4. 
dant. One of them, Tindaria cytherea (Fig. 303), the finest 
