EEPORT ON THE OPHIUROIDEA. 107 



are large and flaring, sometimes have their outer open angle closed by a veil of thin 

 ill-defined lime scales, which running up to the peristomial plate may be of one, two, 

 or three pieces. On their outer and inner faces, the arm bones do not much depart 

 from the type, but those near the edge of the disk have a forward projection on their 

 upper surface. 



See Plate XXXIX. figs. 7-9. 



Table of Species of Ophioconis. 



Seven slender cylindrical tapering nearly equal, arm spines, about as long as an 



arm joint. Disk -wholly granulated above and below, with about 14 grains J» Ophioconis forhesii. 

 in the length of a millimetre. One or two tentacle scales. 



Similar to preceding but only six arm spines, about half as long as a joint, Ophioconis hrevispina. 



Seven slender arm spines, the two uppermost longest. Disk wholly granulated \ 



except mouth shield -with about 6 grains in the length of a millimetre. > OpJiioconis antardica. 

 One large tentacle scale, . . . . . . . ) 



Seven to eight arm spines, the uppermost as long as three arm joints. Disk \ 



wholly granulated : about 13 grains in the length of a millimetre. Two > Ophioconis miliaria. 

 tentacle scales, . , . . , . , .' 



Similar to preceding, but eight to nine arm spines, some of which are flattened ) 



, 1 , , 1 , ( Ophioconis pulverulenta. 



and almost spatulate, . . . . . . . J -' -^ 



Ophioconis antarctica, Lym. (PI. XXIII. figs. 1-3). 



Opihioconis antarctica, Lym., Bull. Mus. Comp. Zool., vol. vi., part 2, p. 44, 1879, pi. xiv. figs. 

 380-382. 



Seven slender, cylindrical, tapering arm spines, the two upper ones longest. One 

 large tentacle scale. Disk closely granulated, except mouth shield ; 5 or 6 grains in the 

 length of 1 mm. 



(Type specimen from Station 150.) Diameter of disk 13 mm. Length of arm about 

 60 mm. Width of arm at base, without spines, 2 mm. There are to each angle of the 

 mouth twelve or fourteen })a23i]lse, of which the innermost are slender and pointed, while 

 tlie outer one on either side is broad and squarish ; at the apex there is a cluster of four 

 or five, which properly might be called tooth papillse. Five or six rather narrow, flat, 

 lilunt teeth, whereof the lowest is often split in two. Mouth shields l:)road triangular, 

 with a blunt angle inward and outer edge nearly straight ; they are more or less obscured 

 by granules, which completely hide the side mouth shields. These are small, longer than 

 wide, and broader without than within, where they nearly or quite meet. Under arm 

 plates much broader than long, pentagonal, with a blunt inner angle, outer edge slightly 

 curved, and laterals re-enteringly curved. Side arm plates somewhat projecting, nearly 



