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



and twenty-eight respectively, while the shapes are clearly distinct (compare d'Orbigny, 

 C^ph. acet., pi. XX. figs. 1-5). 



It also resembles in its rounded fin Lolliguncula brevis (Blv.), but it difiers from it 

 in the greater slenderness of its body and correspondingly narrower fin, the teeth of the 

 suckers too are different both in number and form ; compare the figures here given with 

 those of d'Orbigny, Ceph. acdt., pi. xxiv. figs. 14-19. Very probably it should be placed 

 in the genus Lolliguncula, which is distinguished by the spermatophores being attached 

 to a spot over the left gill in the female. The Challenger specimen bore no spermato- 

 phores, so that it is impossible to be certain of its true position. The male o£ Lolliguncula 

 brevis has not yet been described. 



Division II. CEGOPSIDA, d'Orbigny. 

 Family X. Ommastrephini, Steenstrup. 



Subfamily, OMMASTREPHiDiE, Gill. 



Ommastrephes, d'Orbigny. 



Ommastrephes oualaniensis (Lesson), d'Orbigny. 



1830. Loligo oualaniengis, Less., Voy. " Coquille," Zool., p. 240, pi. i. fig. 2. 

 1832. „ vanicoriensis Q. et G., Voy. "Astrolabe," t. ii. p. 79, pi, v. figs. 1, 2. 

 1832. ,, hrevitentaculata, Q. et G., Ihid., p. 81. 



1839. Ommastrephes oualaniensis, d'Orb., Ceph. acet., p. 351; Calmars, pis. iii., xxi.; Ommast., 



pi. i. figs. 14, 15. 



1862. „ tryonii (.?), Gabb, Proc. Acad. Nat. Sci. Philad., p. 483, with plate. 



1863. „ ayresii {?), Gabb, Carpenter, Rep. W. C. Moll., p. 613. 

 1880. Ommatostrephes oualaniensis, Stp., Ommat. Blaekspr., pp. 76, 84, &c. 



Habitat. — Between Api, New Hebrides, and Cape York, August 22, 1874. From the 

 stomach of a specimen of Sula piscator which alighted on the ship. Eight specimens. 



Pacific Ocean, 2|° north of the Admiralty Island, March 13, 1875 ; surface. One 

 specimen. 



Oualan Island (Lesson) ; Island of Vanikoro (Q. and G.) ; Pacific Ocean, " dans toute 

 son etendue" (d'Orbigny); Indian Ocean, Cape of Good Hope (Tryon). 



This species is readily distinguished from aU others of the family in that the mantle 

 has developed on either side an adhesion to the base of the siphon. The specimens were 

 in bad condition and did not present any points worthy of special notice. 



A young Ommastrep)hes of undetermined species was captured in the surface-net on 

 April 29, 1876, which is interesting because, though only 5 mm. long, it showed the 

 peculiar form of mantle-connective characteristic of the genus. 



