CHARACTERISTIC DEEP-SEA TYPES. CRINOIDS. 117 



Fig. 404. — Metacrinus angulatus. 



2' 



(Carpenter.) 



ferences existing between the liassic and 

 the modern Pentacrinidae led the Austins 

 to establish the oenus Extracrinus for a 

 fossil species which seems to have been 

 gregarious, and of which Queenstedt has 

 figured a magnificent slab, some of the 

 specimens with a stem nearly sixty feet 

 long. The stems were often twisted into 

 a solid, ropelike mass, and are so entan- 

 gled on the slab that it is difficult to 

 make out the individual stems. A sim- 

 ilar entangling also occurred among the 

 specimens dredged by the " Blake," and 

 it was often very difficult to separate speci- 



Fig. 4()(). — Pentacrimis 

 stage of Actinoinetra 

 meridionalis, niagiii- 

 tiefl. 



