The Echinoderm Fauna of South Africa. 229 



Cirri not so numerous, 12 30. 

 Cirrus segments few, 12 20. 



Mouth excentnc; basal pinnules of arms with terminal comb 



Comanthus wahlbergii. 

 Mouth central; no terminal combs on pinnules. 



Arms 10, more or less compressed; arm-segments beyond 



middle of arm, short, the distal portion more or less rough 



and projecting . . . Tropiometra carinata. 



Arms 10, or more in adults, not compressed ; arm-segments 



beyond middle of arm not short with the distal portion 



more or less rough and projecting Pachylometra sclateri. 



Cirrus segments numerous, 60 63 . Crotalometra magnicirra. 



Arms only five. . Pentametrocrinus varians. 



BOURGUETICRINIDAE. 

 BYTHOCRINUS CHUNI. 



Rhizocrinus chuni Doderlein, 1907, SIBOGA Stalked Crinoids, 



p. 14, fig. 6; pi. 1, fig. 5. 



Rhizocrinus (Bythocrinus) chuni Doderlein, 1912. VALDIVIA 

 Stalked Crinoids, p. 14, pi. 3. 



The specimens of Bythocrinus in the collection all lack the arms, 

 and only two have the calyx still intact. The best has the stalk 47 mm. 

 long and half a millimeter thick at the top; the calyx is 3 mm. 

 high and rather more than 1'5 mm. in diameter at the top. All 

 the specimens are white. They answer so well to Doderlein's descrip- 

 tion and figures of his specimens from off the Somaliland coast, that, 

 in spite of their imperfect condition, their identity seems sure. 



PIETER FAURE. 17350. Cape Point. N. 86 E., 43 miles. 9001000 

 fms. Gray mud. 4 specimens. 



MONACHOCRINUS COELUS, * Sp. nOV. 



Plate VIII. Fig. 1. 



Fragment of upper part of stem present, not quite 7 mm. long, 

 about -30 mm. in diameter at broken end, a very little thicker where 

 it joins calyx; it is made up of 29 segments of which the topmost 

 1'2 are very low and discoidal, the height about one-fifth or one-sixth 

 the diameter; the next six are discoidal but successively higher; the 

 nineteenth is nearly, and the twentieth quite, as high as thick, and 



* xol/loc; ^ hollowed, in reference to the slightly concave lines of basals and 

 radials. 



