356 Bvlletin Vanderbilt Marine Museum, Vol. VII 



Africa (Joubin) ; Mauritius (Robson) ; Persian Gulf (Massy) ; 

 Ceylon, Pondicherry (Robson) ; Malaysia (Brock) ; Aru Islands 

 (Wulker) ; Gulf of Siam (Massy) ; Penang, China, also Chusan 

 Archipelago (Robson) ; Japan (Joubin, Ortmann, Robson) ; Mar- 

 shall Islands, western Pacific (Hoyle, Robson, Boone). 



Material examined : One specimen, taken at Jebwar, Jaluit 

 Island, Marshall Islands, December 30, 1928, by the "Ara." 



Technical description : Reference is made to the excellent 

 description of this species by Robson (1929, p. 104, figs. 27-30) 

 in his classical "Monograph of the Recent Cephalopoda, based on 

 the collections in the British Museum of Natural History." Mr. 

 Robson has probably had access to the most comprehensive series 

 of specimens reported. 



The present specimen, a male, is especially interesting, as it 

 establishes another record for the species from the Marshall 

 Islands, from which locality it was first recorded by Dr. Hoyle 

 (1907), with some uncertainty, since his specimen was juvenile, 

 of not quite 10 centimeters total length ; a second record of a male 

 from the Marshall Islands was reported by Mr. Robson. 



The "Ara" specimen, a male, has a total length of 20 centi- 

 meters. The mantle is of the characteristic slender, ovoidal shape, 

 with the head smallish, of diameter somewhat less than that of 

 the body. The arms decrease in the order 1, 2, 3, 4, being from 

 80 to 85 percentum of the total length, the first pair of arms being 

 longer and somewhat thicker than the others ; the hectocotylized 

 arm is definitely shorter than its companion. The suckers are ar- 

 ranged in regularly spaced, alternate dual series, each sucker hav- 

 ing a diameter slightly more than one-half of the width of the arm 

 at the point where the sucker occurs. The mantle cavity is quite 

 wide, extending to a point on either side just posterior to the orbit. 

 The web is distinctly characteristic, attaining a depth of from 15 

 to 20 percentum of the related arm length, the greatest depths of 

 web occurring between the arms of pair I and pairs I and II, be- 

 coming gradually shallower between pairs II and III, again de- 

 creasing between pairs III and IV and of least depth between the 

 arms of pair IV. The arm membranes are not much developed. 

 The funnel is prominent, obconic, free for about the distal half. 

 The locking ridge is strong, but incised by a deep infundibular 

 notch. The funnel organ is W-shaped. There are twelve filaments 

 in each half. The beak has been figured by Naef (1923, pi. 18, 



