1915.] NATURAL SCIENCES OF PHILADELPHIA. 85 



brevispina Ludwig. Ophiochceta contains only 0. hirsuta Liitken. 

 Genuine Ophioconis much resembles Cryptopelta, but has, however, 

 hyaline arm spines. Genuine Ophiochceta appears to be very near 

 Pectinura, but is, however, covered with fine spines, instead of granules, 

 on the disk. " Ophioconis^ ^ indica Koehler, which I do not dare to 

 name generically, as I have not myself examined it, appears to 

 resemble Pectinura, except for the hyaline arm spines and the presence 

 of a single tentacle scale on most of the tentacle pores, instead of two. 



OPHIUROCONIS gen. nov. 



Disk and oral angles, including oral shields, closely covered with 

 fine granules. Six or seven oral papillae on either side of each jaw; 

 outermost one pointed inwards, stretching above next papilla, which 

 is the largest. Teeth triangular and obtusely pointed. Arms not 

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

 very slender tip, where the vertebrae are imperfectly divided into 

 halves by a longitudinal series of pores. Ventral arm plates wider 

 than long, not in contact with each other, except on the most proxi- 

 mal joints. Arm spines six or more, more or less long, flattened, 

 hyaline and not appressed. One or two tentacle scales to each pore. 



Ophiuroconis monolepis sp. nov. 



This species is at once distinguished from both 0. pulverulenta 

 and miliaria by fewer oral papillae, by fewer and shorter arm spines 

 and by the presence of a single tentacle scale, instead of two, to each 

 pore. Oral papillae, six or seven in number on either side of each 

 jaw, close-set and acute. Each lateral arm plate bears six or seven 

 arm spines, which are rather spiniform, acute, slightly flattened 

 and hyaline; uppermost one or two spines nearly twice as long as, 

 and lowest one slightly shorter than, corresponding arm joint. A 

 single small, leaf-like, but acutely pointed, tentacle scale at each 

 pore. Dorsal arm plates, rather small, fan-shaped, not in contact 

 with each other, wider than long, convex along median line, so that 

 the arm is keeled dorsallj^ as a whole. Ventral arm plates, very 

 small, much wider than long, much shorter than corresponding arm 

 joint. All the dorsal, lateral and ventral arm plates are concen- 

 trically striated. 



The type specimen is 5 mm. across disk, 25 mm. in arm length and 

 1 mm. in arm width at base. Color in alcohol : light yellow. 



Six specimens; Sagami Sea, 85 fathoms. Two specimens; Sagami 

 Sea, 300 fathoms. 



