290 DISCOVERY REPORTS 



I may take the opportunity of pointing out here that one more species has erroneously 

 been referred to the genus Ophioceramis, viz. O. aJbida of Ljungman. This was origin- 

 ally described by Ljungman as an Amphipholis, but by Lyman transferred to Ophio- 

 ceramis, which is accepted by H. L. Clark. There can in my opinion be no doubt that 

 this species does not belong to any of these genera, but to the genus Amphioplus. The 

 teeth in particular are very different from those of the typical Ophioceramis — few, simply 

 tongue-shaped in O. albida, very numerous and excavated in Ophioceramis; also the 

 dorsal arm-plates are quite different — simple in O. albida, more or less irregularly 

 divided longitudinally in Ophioceramis. 



Amphiodia acutispina, Koehler 



Atnphiodia acutispina, Koehler, 1914. Meeresfauna Westafrikas. Echinoderma, p. 195, 

 pi. vii, figs. 11-14. 



St. 279. 10. viii. 27. Off Cape Lopez, French Congo, 58-67 m. i specimen. 



The single specimen, like those described by Koehler, has lost the disk and the 

 greater part of the arms. But there can be no doubt of its identity with this character- 

 istic species. 



Amphiodia ascia,i n.sp. 

 (Plate VII, fig. II) 

 St. 272. 30. vii. 27. Off Elephant Bay, Angola, 73-97 m. 2 specimens. 



Diameter of disk 5 mm., arms apparently about six to seven times that length. 

 Interradial edges of disk slightly concave. 



Disk scales small, imbricating; there is no trace of primary plates, at most a small 

 central plate discernible. Radial shields rather large, about as long as half the disk 

 radius ; they are separated in one of the specimens by only a single, narrow wedge of 

 scales, in the other by several more scales. Ventral interradii almost totally naked, only 

 with some few small, widely scattered scales. Buccal shields almost circular, only at 

 the distal edge narrowing so as to form a broad, rounded lobe (Fig. 24 a) ; in the 

 second specimen this outer lobe is a little more distinct. Adoral plates not quite 

 joining within; they have a broad outer lobe, separating the first lateral plate from the 

 buccal shield. Mouth papillae very characteristic : a very small, scale-like one outermost, 

 and then a long, spine-like papilla. Infradental papillae, as well as the papilla of the 

 first mouth tentacle, of the usual shape, but the jaws are unusually high. First ventral 

 plate broad and square. Those following about as broad as long, broadly contiguous in 

 the proximal part, the sides and the distal edge with a slight re-entrant curve; the 

 proximal three to four plates have a rather distinct keel on each side. The dorsal arm- 

 plates are about twice as broad as long, with a rounded inner angle and a convex distal 

 edge. Arm spines six or seven, the lowermost slightly the longest, about the length of 

 an arm-joint, the following gradually smaller, the uppermost one being the smallest. 



1 Ascia = a hatchet. 



