312 ABT. 2. — H. MATSUMOTO : 



the hyaline arm spines. There is some possibihty that, Ophioconis 

 and Cryptopelta are congeneric and that " Ophioconis " iîidica is an 

 extreme form of Pectinura. 



Ophiuroconis Matsumoto, 1915. 



Disk and oral angles, including the oral shields, closely 

 covered with fine grannies. Six or seven oral papillae on either 

 side of a jaw ; the outermost one is pointed inwards and projects 

 above the next papilla, which is the largest. Teeth triangular 

 and obtusely pointed. Dental papillae absent. Arms not very 

 long, cylindrical, widest at the base, tapering outwards to a very 

 slender tip, where the vertebrae are imperfectly divided into halves 

 by a series of pores. Ventral arm plates wider than long, not in 

 contact with one another except in the very basal joints. Six or 

 more arm spines, long, flattened, hyaline, laterally flared. One or 

 two tentacle scales to each pore. 



This genus includes Ophioconis puherulenta IjYMan, 1879, 

 and 0. miliaria Lyman, 1878, besides the genotype, Ophiuroconis 

 monolepis Matsumoto, 1915. 



OpJiiiirocoiiis inonolepis Matsumoto. 



OpMuroconis monolepis : Matsumoto, Proc. Acad. Nat. Sei. Philadelphia, 

 1915, p. 85. 



Six specimens ; Sengendzuka-Aoyamadashi, Sagami Sea ; 85 

 fathoms. Two specimens ; Mera-out-Oisegaké, Sagami Sea ; 300 

 fathoms. 



Diameter of disk 5 mm. Length of arms 25 mm. Width of 

 arms at base 1 mm. 



Disk nearly circular, slightly puffed interbrachially, very soft, 



