80 PROCEEDINGS OF THE ACADEMY OF [Feb., 



outwards, the plates are longer than wide, hexagonal, with very 

 short proximal and proximo-lateral sides, concave lateral margins 

 and a very convex distal side. Arm spines seven or eight, including 

 the tentacle scales, on the free basal joints, fine, conical, short; 

 middle ones longer than upper and lower ones, and about half as 

 long as corresponding arm joint; diminishing in number outwards; 

 the lower spines are much finer and serve as tentacle scales. Second 

 oral tentacle pore, very large, opening outside oral slit, bounded by 

 three or four scales on each side. Tentacle pores large, guarded 

 on basal joints by one to three aboral scales, besides the lower arm 

 spines on the adoral side. Color in alcohol: pale gray. 



Numerous specimens ; Sagami Sea. Numerous specimens; Sagami 

 Sea, 75 and 100 fathoms. 



This species is viviparous. I once dissected out twenty-four 

 embryos of various sizes from a single adult. 



OPHIUROLEPIS gen. nov. 



Disk covered with larger rounded plates and smaller scales, the 

 former surrounded by belts of the latter. Radial shields moderately 

 large, rounded, separated from each other. Adoral shields oval, 

 with rounded inner border and obtusely pointed outer end. One 

 to three supplementary plates are present in each space between the 

 adoral shields and oral plates. Teeth and oral papillse present, the 

 latter very close set. Arm combs, as well as genital papillse, absent. 

 Arms long, stout, very gradually tapered. Dorsal arm plates very 

 well developed, widely in contact with each other. Lateral arm 

 plates low. Ventral arm plates triangular, nearly or scarcely in 

 contact with each other. Second oral tentacle pores open entirely 

 outside oral slits, long, slit-like, closed by tentacle scales, which 

 are modified so as to appear like supplementary plates. A single 

 arm spine and three tentacle scales, both being minute and peg-like. 



This new genus contains a single species, Ophiolepis carinata 

 Studer, 1876 ( = Ophioglypha deshayesi Lyman). 



Ophiurolepis is very peculiar in every feature, as it is certainly 

 not referable to Ophiura, even in a wide sense. The disk squamation 

 reminds us of that of Ophiolepis. 



OPHIURA Lamarck, 1816; Forbes, 1839 (restr.). 



Synonyms: Ophioglypha Lyman, 1860; Ophioylyphina Ludwig, 1886. 



Disk low, flat, covered with plates and scales, among which the 

 primaries are usually very prominent. Radial shields usually 



