390 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [180] 



be counted with the naked eye. The tips are very slender and covered 

 with very minute suckers. 



Color of body and head above, and of upper arms, deep brownish 

 purple; lower surfaces of body and head with siphon and ventral arms, 

 pale yellowish. 



A fine specimen of this interesting species was taken in Vineyard 

 Sound, Mass., by Mr. V. X. Edwards, in 1876. It was not known pre- 

 viously from the American coast, and has been regarded as peculiar to 

 the Mediterranean and West Indies. The total length of this specimen 

 is 203 millimeters ; of mantle, 51 millimeters ; circumference of body, 152 

 millimeters; length of dorsal arms, from eye, 137 millimeters; second 

 pair, 94 millimeters ; of third pair, 84 millimeters ; of fourth pair, 134.5 

 millimeters. 



The remarkable tubercles of the ventral surface mostly have five ridges 

 converging to each, rarely six. In all other respects it agrees with the 

 figures of Ferussac and D'Orbigny. According to Targioni-Tozzetti, P. 

 catenulata is distinct from P. tuberculata. If so, our species should bear 

 the former name. Steenstrup considers Octopus carena Ver., the male. 



Family ALLOPOSID^E Verrill. 



Trans. Conn. Acad., v, p. 365, 1881. 



Body thick, obtusely rounded ; arms extensively webbed ; mantle 

 united directly to the head, not only by a large dorsal commissure, 

 but also by a median-ventral and two lateral longitudinal commissures, 

 which run from its inner surface to the basal parts of the siphon. The 

 male hectocotylized right arm of the third pair is developed in a cavity 

 in front of the right eye, and when mature, protrudes from an opening 

 on the inner surface of the web, between the second and fourth pairs of 

 arms, and finally becomes detached. It is furnished with two rows of 

 large suckers, and with a fringe along the sides. The mode of attach- 

 ment of the mantle to the head is similar to that of Desmoteuthis, among 

 the ten-armed cephalopods. 



ALLOPOSUS Verrill. 



Alloposus Verrill, Ainer. Journ. Sei.,xx,p. 393, Nov., 1880; Proc. Nat. Mus., iii, p. 362, 

 Dec., 1880; Bulletin Mus. Comp.Zool., viii,p. 112, March, 1881; Trans. Conn. Acad., v, 

 p. 365. 



Allied in some respects to Philoncxis and Tremoctopus. Body thick 

 aud soft, smooth; arms (in the male only seven) united by a web ex- 

 tending nearly to the ends. Suckers sessile, simple, in two rows; mantle 

 united firmly to the head by a dorsal, ventral, and two lateral muscular 

 commissures, the former placed in the median line, at the base of the 

 siphon; free end of the siphon short, well forward. 



In the male, the hectocotylized right arm of the third pair is devel- 

 oped in a sac in front of the right eye (Plate XXXIX, figs. 1, la); as 

 found in the sac, it is curled up, and has two rows of suckers; the 



