CEPHALOPODS OF THE PHILIPPINE ISLANDS 159 



Family Octopodidae 



Octopus membranaceus Quoy and Gaimard, 1832 



Figure 36 

 Octopus membranaceus Quoy and Gaimard, 1832, p. 89. 



Material.— 1 9, ML 20.0 mm., from Sta. D5360, off Corregidor 

 Light, Manila in 22 m., Feb. 7, 1909. 



Description. — This small specimen is probably immature. The 

 mantle is squat and globular, nearly as wide as long, bluntly rounded 

 posteriorly, and with a constriction between the mantle and the 

 rather small head. The funnel is long and tubular and the funnel 

 organ is conspicuous, located mostly on the dorsal side, and forming 

 a W with slender limbs. The head is small, compact, with only 

 slightly projecting eyes. There are two ocular cirri above the eye, 

 a large warty posterior one and a small inconspicuous anterior one. 



The arms are long and slender, attenuate distally. The suckers 

 are biserial and rather widely spaced. The arm formula is 3.4.2. L 

 The web is only moderately deep with the formula C.D.B.E.A., with 

 a low thin extension along the ventral side of each arm. 



The gills are large and short, rather low in number, with seven 

 or eight lamellae per demibranch. 



The oviduct is rather large and very long, the oviducal gland 

 small, very posterior, and striated. 



The sculpture consists of closely set small papillae, there are a few 

 scattered larger papillae on the dorsum of the head and mantle, and 

 numerous, moderately large papillae scattered on the aboral surface 

 of the arms. The two supraocular cirri are located as described 

 above. 



The color is grayish or brownish with dark-pm-plish bands on the 

 head, mantle, and arms. A single large brownish ocellus is on each 

 side of the head about midway between the eyes and the edge of 

 the web. The ocellus is solid with no indication of a ring or center. 

 On the mantle there are four broad bands, the lateral ones crossing 

 the eyes. The middle two converge in the middle of the head. Each 

 arm is bordered dorsally by a narrow distinct, nearly black line from 

 the base to near the tip. The dorsal arms may also have a less 

 distinct band ventrally. At least in the dorsal arms the aboral 

 surface is crossed by a few widely spaced dark bars. 



