CHARACTERISTIC DEEP-SEA TYPES. — CORALS. 151 
mophyllum crista-galli came up attached to the stem of a Prim- 
TEN 
Fig. 469. — Desmophyllum Riisei. +. Fig. 470. — Desmophyllum solidum. — 2. 
(Pourtales.) (Pourtalés.) 
noa. JAhizotrochus fragilis (Fig. 471) was obtained in about 
Fig. 471. — Rhizotrochus fragilis. 2. Fig. 472. — Lophohelia prolifera. 4. 
(Pourtales. ) (Pourtalds.) 
forty different casts along the Florida Reef, in depths varying 
from 49 to 324 fathoms. It was most abundant between 100 
and 200 fathoms. The color of the polyp is greenish or pale 
brick-red. Lophohelia prolifera (Fig. 472) has a very exten- 
