CEPHALOPODS OF THE PHILIPPINE ISLANDS 117 



Distribution. — Worldwide in warm and temperate seas. 

 Philippines! 



Family Onychoteuthidae 



Onychoteuthis banksi (Leach, 1817) 



Figure 27,d 



Loligo hanhsii Leach, 1817, p. 141, 



Onychoteuthis hanksii, d'Orbigny, 1826, p. 161. — PfeflFer, 1912, p. 70. 



Material.— 1 9, ML 60.0 mm., from 6.4 mi. off Buka Buka Id., 

 Sta. D5611, Nov. 19, 1909. Gulf of Tomini, Celebes, at sm-face; 

 USNM 574889. 



Description. — A single juvenile female of this cosmopolitan species 

 was obtained by the Albatross in the Celebes. The description is 

 based entirely upon this individual. 



The mantle is tubular, flai'ed at the anterior margin, and from 

 thence nearly straight-sided to the origin of the fins where the mantle 

 becomes abruptly much narrower, tapering with concave sides to a 

 blunt point. A ridge or keel which is rather characteristic of the 

 genus is on the ventral surface of the point. The anterior mantle 

 margin is slightly dorsally produced in the midline but ventrahy is 

 strongly emarginated beneath the funnel with sharp lateral lappets. 

 The gladius is seen as a narrow dark line along the dorsal midline. 



The large fins in this specimen, amounting to about half the length 

 of the mantle, their width two-thhds of the mantle length, are partly 

 a juvenile character. The anterior lappet is free, the outer angle 

 sharp, the posterior borders forming about a 90° angle. 



The funnel is small and compact, deeply set into the ventral sur- 

 face of the head. The locking apparatus consists of a slightly sinuous 

 cartilaginous groove on the funnel and a very long, narrow ridge on 

 the mantle. The funnel organ is an inverted V with oval ventral pads. 



The head is compact, as wide as the mantle, with prominent eyes. 

 The eyelids are semicircular, round in front, truncate posteriorly, 

 with a deep sinus in the anteroventral margin. There are transparent, 

 unpigmented "windows" above and beneath the eyes. There are 11 

 nuchal folds on each side of the funnel of which the ventralmost 3 are 

 the largest, the one just posterior to the eyes the largest of all. 



The arms are long, in the order 2=4.3.1. I is keeled on its distal 

 half, II is without an aboral keel but has a well-developed membrane 

 along the ventral side. III is keeled along its entire length, the keel 

 broadest on the distal half. IV has a sharp angle ventrally and a 

 broad membrane on the dorsal edge. The suckers on all the arms are 

 biserial and are bordered on each side by a trabeculate protective 



