200 RECENT OPHIURANS. 



end more or less separates the oral shield from the first side arm-plates. Oral 

 plates larger than adorals; on the margin are 6 or 7 small, pointed oral papillae, 

 the most proximal largest and most distal smallest. Three or four broad, 

 bluntly pointed teeth are on the angle of the jaw, but no true tooth-papillae. 

 On one of the adoral plates is a small, fiat papilla guarding the very large oral 

 tentacle-pore; apparently there were two or three such papillae on each adoral 

 plate but they have been rubbed off. First under arm-plate fairly large, indis- 

 tinctly pentagonal, the distal side shortest; second plate much larger, pentagonal; 

 succeeding plates more or less hexagonal, nearly or quite in contact until far out 

 on arm, after the fourth or fifth becoming longer than wide and with a distinct 

 median notch on distal margin. Side arm-plates not conspicuous, meeting 

 above and below very narrowly and indefinitely; each plate bears 6 or 7 fragile, 

 slender, nearly smooth arm-spines of which the next to the uppermost is longest 

 and may equal two arm-joints. Tentacle-scales thin, flat, and pointed; there 

 are two at each pore on the basal arm-joints but only one, on the middle and 

 distal joints. Color, pale brown. 



HoLOTYPE (M. C. Z. 2042). Japan: Uraga Channel, about 200 fm's. 

 Owston collection. 



This specimen is not very near any species hitherto described except hirta 

 Liitk. & Mort. from the west coast of Mexico. Its affinities are clearly with 

 the West Indian species hirsuta Lyman and ensifera Verrill and it would thus 

 fall in Verrill's proposed genus Ophiopristis, a group which I am not yet prepared 

 to recognize. From hiria, it appears to differ in a number of details, the most 

 important of which are the form of the under arm-plates and the armature of 

 the jaws. 



245. O.XEVLSPINA Lyman, 1878. Bull. M. C. Z., 5, p. 147. 1882. Challenger Oph., pi. 25, f. 1-3. 



19 specimens. Japan: off Omai Saki Light, 624 fms.; Bungo Channel, 

 720 fms. ; off Kagoshima Gulf, 361 fms. Sea of Japan, 224-248 fms. Eastern 

 Sea, 440 fms. 



246. 0. MACROPLACA sp. nov. (^Mpis, long + ttXAJ, a plate). Plate 1, f. 6, 7. 



Disk 2 mm. in diameter; arms, 10-11 mm. long. Disk covered with minute 

 scales each of which bears a low, round granule; here and there one of these 

 granules is elongated into a pointed spinelet. Radial shields concealed or their 

 distal ends somewhat exposed. Upper arm-plates longer than wide (hence the 

 name) quadrilateral (or triangular with proximal angle more or less truncated), 

 much wider distally than proximallj% more or less in contact throughout; distal 



