CHARACTERISTIC DEEP-SEA TYPES. - - CORALS. 151 



mophyllum crista-yalli came up attached to the stem of a Prim- 



ig. 4f>9. Desmophyllum Riisei. \. Fig. 470. Desmophyllum solidum. f . 



(Pourtales.) (Pourtales.) 



noa. Rhizotroclms fracjilis (Fig. 471) was obtained in about 



Fig-. 471. Rhizotrochus fragilis. |. 

 (Pourtales.) 



Fig. 472. Lopholielia prolifera. 1. 

 (Pourtal^s.) 



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- 



