No. 5. — Reports on the Results of Dredging, under the Supervision 

 of Alexander Agassiz, in the Gulf of Mexico and in the Carib- 

 bean Sea (1878-79), by the U. S. Coast Survey Steamer "Blake," 

 LiEUT.-CoMMANDER C. D. SiGSBEE, U. S. N., and Commander J. E. 

 Bartlett, U. S. N., Commanding. 



(Published by permission of Carlile P. Patterson and J. E. Hilgard, Super- 

 intendents of the U. S. Coast and Geodetic Survey.) 



XXV. 



Supplementar?/ Report on the Blake Cephalopods. By A. E. ^errill. 



The following paper includes the results of an examination of a small 

 collection of Cephalopods received after my former report had been 

 printed. The specimens are not numerous, but among them there are 

 two very remarkable new genera, of unusual interest. 



All the specimens in this lot were taken in the West Indian region, 

 and mostly in rather deep water. 



Abralia megalops Verrill. 



Amer. Jour. Sci., Vol. XXIV. p. 364, 1882. 



Plate III. Fig. 4. 



A small immature specimen occurred at Station 294, in 137 fathoms off 

 Barbados, 1878-79. 



The body is moderately long, pointed posteriorly, with the anterior mantle- 

 edge prolonged into a broad, blunt median angle. Caudal fins large, the base 

 rather large, occupying nearly one third the length of the mantle. Taken 

 together the outHne is broad-rhomboidal, and slightly sagittate ; the outer angle 

 of the fin is obtusely pointed ; the anterior margin is broadly convexly cui-ved, 

 projecting forward somewhat beyond the base. Head rather large. Eyes very 

 large. Arms slender, the dorsal ones shorter than the others, which are sub- 

 equal. Tentacular arms long, very slender, more than twice as long as the 

 sessile ones. The connective cartilage at the base of the siphon is large, broad- 

 est posteriorly, tapering to a blunt point anteriorly, with a central longitudinal 

 furrow, having thickened margins. 



VOL. XI. — NO. 5. 



