72 THE VOYAGE OF H.M.S. CHALLENGER. 



spiral of one and a half turns (PL XIII. fig. 8). The thread was removed from its sac 

 and was then seen to present the form depicted in fig. 9. It is about 12 mm. in length, 

 and there is a swelling near one end of it (fig. 9, a) which is evidently the rudiment of 

 the " pyriform portion " or capsule figured by Steenstrup in Tremoctopus quoyanus, and 

 by Verany in several Mediterranean species ;^ while the more slender continuation of the 

 arm is evidently the filament of other forms. One side of it bears two series of minute 

 suckers, as for as the swelling above mentioned. There is nothing to indicate that the 

 adult hectocotylus would differ materially from that of other species, but in the other 

 young forms which I have seen, it has been developed in a small globular swelling, and 

 not laid out flat under the skin. 



As regards other specific characters, the dorsal arms are about twice the length of the 

 mantle and a little longer than the second pair ; the ventral arms are about as long as 

 the mantle and nearly twice as long as the third pair. There is a pair of aquiferous 

 pores on the top of the head, and another pair situated one on either side of the siphon ; 

 the eyes are large and spheroidal, but do not present the pedunculate apjjearance seen in 

 Eydoux and Souleyet's figure. 



Family V. Alloposid^, Verrill. 



Alloposus, Verrill. 



HalipJiron {?), Steenstrup. 



Alloposus mollis, Verrill. 



1861. Haliphrun atlanticus {?), Stp., Vid. Mecldel. nat. Eoren. Kj0benhavri, Aar 1860, p. 333. 



1880. Alloposus mollis, VIL, Amer. Journ. Sci. and Arts, vol. xx. p. 394. 



1881. „ „ VIL, Ceph. N. E. Amer., pp. 366, 420, pis. L, li. figs. 3, 4. 

 1884. „ „ VIL, Second CataL, p. 247. 



Habitat. — North Atlantic. Two fragments of a dead specimen. 

 , Off Newport, Ehode Island, 238 to 506 fathoms ; off Chesapeake Bay, 300 fathoms ; 

 off Delaware Bay, 197 fathoms; off Martha's Vineyard, 310 to 715 fathoms; south of 

 Nantucket Island, U.S.A., 1346, 1735 and 1731 fathoms (Verrill). 



A bottle labelled " Part of a mutilated cuttle-fish picked up at sea. North Atlantic," 

 came into my hands among the collection : it contained part of the interbrachial web 

 near the mouth and a portion of an arm. 



The web measures about 16 cm. in its greatest diameter, and contains portions of 



1 HectocotyL, p. 208, pL ii. fig. 8a ; Ceph. medit., pi. xli. I may liere correct a mistake in Mr. Dallas' rendering of 

 Steenstrup's paper (4k?i. and Mag. Nat. Hist, ser. 2, vol xx., 1857) ; on p. 104, line 33, for "althougli tMs" read "and 

 it." The mistake may have arisen through the English version having been taken from a German one and not directly 

 from the Danish. 



