312 



THE VOYAGE OF H.M.S. CHALLENGER. 



the radiate of other Crinoids, while the other five, alternating with them, are partly 

 separated from the centro-dorsal by the basate, the ends of which appear externally 

 beneath the middle lines of these additional radiate. The upper faces of the radiate are 



Fig. 123.— Prmnachocrinus kergwlensis, P. H. Carpenter. 

 The calyx. A, from the side ; B, from above. 



all alike, however ; and they form an elegant decagonal funnel which supports the centre 

 of the disk (fig. 123 b). Except in the presence of five additional radiate, Promachocrinm 

 does not differ in any essential characters from Antedon. 



Fro. VH.—Thaumaioerinus renomiut, V. II. Carpenter. 



A, The calyx, anal side. B, The disk from above, an, anal appendage ; an, anambiilacral plates ; at, anal tube ; 

 b, basal ; h„, second brachial j cd, centro-dorsal ; /, interradial ; o, oral ; /■, radial 



"Together with Promachocrinus abyssorum there wafs omul, at Station 158, another 

 Comatula of a very singular type, for which the generic name T/iaumatocrinus ' has been 

 proposed (fig. 124 a, b). 



1 Hx'uuu, wonder. 



