1912.] NATURAL SCIENCES OF PHILADELPHIA. 407 



more. The distal half of the arm is sucker bearing, but on the 

 specimen in hand only the pedicels remain. The right dorsal arm 

 is essentially like that of the 9 except that the suckers along its 

 central portion are very much larger than the rest and hence fewer 

 in number. The same peculiarity is true of the outer row of suckers 

 on the second pair of arms of the cf and to a much less degree of 

 the ventral arms. The suckers of the third-arm pair are very minute 

 and relatively very widely spaced. 



Individual suckers of the sessile arms nearly spherical, with very 

 small apertures and smooth horny rings. They break off with such 

 ease that few of my specimens retain an average of more than two 

 or three on each arm. 



Tentacles slender, as long as the body, but when bent back not 

 extending beyond the fins; tentacular club but little thickened, 

 with a thin membrane along its inner margin, its inner surface 

 villous; a microscopic examination shows the velvety appearance 

 to be due to the exceeding minuteness of the suckers which clothe it; 

 the latter long pediceled and closely placed in about eight rows. 

 Individual suckers bell-shaped, the wide openings surrounded by a 

 papillary area, outside of which is a thin, broad, outwardly flaring, 

 striate membrane; horny rings well developed, seemingly armed 

 with twenty or more distinct acute teeth, but it is not outside the 

 range of possibility that the apparent teeth may be merely very 

 large papillae or chitinous projections from the papillary border. 



Beak and radula not examined. Gladius none. 



Color when living not observed; in alcohol a pale yellowish-brown, 

 the chromatophores appearing as bluish-black spots, quite small 

 and distinct on the mantle, larger and more run together on the head. 



Measurements . 



Cotypes. 



Sex. <? . c? % . 9 



Number in author's register [112] [111] [391] [392] 



Length total (excluding tentacles).... 40 32 35 31 



Lengt-h of mantle, dorsal....... 19 .16 17.5 15 



Width of body , 12 12 13 10.5 



Width of nuchal commissure 5.5 565 



Width across fins . 23 25 24 



Length of fin, extreme 10 9.5 9 



Length of fin at point of attachment. 6.5 5.5 6 5.5 



Length of dorsal arm (left side) 16 9 10.5 10 



Length of second arm 18 14 12 12 



Length of third arm 18 14 13 12 



Length of ventral arm 13 13.5 12 10 



Length of tentacle 27 23 26 20 



