140 "U.S. NATIONAL MUSEUM BULLETIN 23 4 



(Sasaki, Nishikawa, Albatross), Sumatra (Chun), Bay of Bengal, 

 Gulf of Oman, and the Arabian Sea (Massy). It is now first recorded 

 from the Philippine Islands! 



Subfamily Mastigoteuthinae 



Mastigoteuthis cordtformis Chun, 1908 



Figure SO,b-h 



Mastigotenthis cordiformis Chun 1908, p. 88; 1910, p. 222.— Pfeffer, 1912, p. 613.— 

 Sasaki, 1920, p. 200; 1929, p. 310.— Adam, 1954, p. 159. 



Material. — 1 9, ML 92.0 mm., Sta. D5114 off Sombrero Id., 

 Balayan Bay, Luzon, in 623 m., Jan. 20, 1908; USNM 574891. 

 1 9, ML 72.0 mm., Sta. D5378 off Mompog Id., in 720 m.. Mar. 4, 

 1909; USNM 574895. 1 cT, ML 60.0 mm., indet. sex, ML 36.0 mm., 

 from Sta. D5283, off Malavatuan Id. off southern Luzon, 513 m., July 

 18, 1908; USNM 574892. 1 (?), ML 41.0 mm., Sta. D5296, Matacot 

 Point, southern Luzon, in 384 m., July 23, 1908; USNM 574894. 

 1 9, ML 48 mm., Sta. D5122 off Malabrigo Light, east coast of 

 Mindoro, in 404 m., Feb. 2, 1908; USNM 574893. 



Description. — The mantle is soft and flabby as is characteristic of 

 most deepwater cephalopods. The mantle is broad near the anterior 

 end, convex anteriorly, but tapers quicldy with concave sides to a 

 narrow slender extremity. The dorsal margin is slightly produced in 

 the midline but excavated beneath the funnel. In most of the speci- 

 mens the skin is closely set, especially in the mouth, head, and bases 

 of the arms, with small round tubercles as shown in the figure. 



The fins are large, 70 to 80 percent of the mantle in length and 

 65 to 85 percent in width. They are slightly transversely oval in the 

 midportion, with convex anterior and posterior borders, but near the 

 posterior end the fins narrow and become drawn out in a sharp point. 



The funnel is large, free for about half of its length, and bears a 

 small subterminal valve. The dorsal member of the funnel organ is 

 inverted V-shaped, with rounded arms and a prominent papilla 

 anteriorly. The ventral members are stout, oval, with semitruncate 

 anterior ends. The locking organ is ear-shaped and oval on the fun- 

 nel, with a prominent ventral flap. The mantle member is a deep 

 raised ridge resembling, as Sasaki stated, a human nose. 



The head is large, its width 25 to 35 percent of the mantle length 

 and slightly greater than the mantle width. In general appearance it 

 is round, slightly flattened dorso-ventrally, and sharply demarcated 

 by a narrow neck region. A small but distinct stalked olfactory papil- 

 la is located below and posterior to each eye. The eyes are relatively 



