CEPHALOPODS OF THE PHILIPPINE ISLANDS 75 



length, thence tapering into a blunt point posteriorly. The anterior 

 margin is produced into a narrow rounded lobe in the dorsomedian 

 region. Ventrally, it is shallowly excavated beneath the funnel. 

 There is a longitudinal ridge on the ventral surface of the male. 



The fins are rhombic in outHne, widest at the midpoint and united 

 by a ridge around the end of the body. Both the anterior and 

 posterior margins are nearly straight, the angle rounded. There is a 

 very small, anterior free lobe. 



The funnel is stout and broad, reaching beyond the eyes. The 

 locking mechanism is straight and simple. The funnel organ consists 

 of a V-shaped dorsal member and long oval ventral pads. The valve 

 is large and conspicuous, filHng the end of the funnel. 



The head is small and compact with large eyes. It is shghtly 

 flattened and excavated ventrally for the funnel. There is a large 

 olfactory crest below and posterior to the eye and a large pore between 

 the eyes and the base of the arms. 



The arms are moderately long, in the order 3.4.2.1. All the arms 

 are distinctly keeled for their entire length and are strongly com- 

 pressed, especially I and III. The keel on III is broad and forms 

 a swimming membrane; IV has both a dorsal and ventral keel, of 

 which the ventral is more conspicuous in the males. 



The suckers are biserial, bordered on each side by a trabeculate 

 protective membrane. The suckers have wide apertures, the horny 

 ring smooth on the proximal half and toothed on the distal half, the 

 ring surrounded by a papillated band. The teeth on the distal half 

 are 7 to 11 in number, long, broad, and flat with square ends. On the 

 proximal half of the sucker ring is a series of rudimentary teeth. 



The left ventral arm is hectocotylized in the male. More than half 

 of the basal section of the arm has normal suckers; a little past the 

 middle of the arm two or three of the suckers are greatly reduced in 

 size. Immediately thereafter the pedicels of both rows become very 

 elongate, large, and fleshy. The first few terminate in small suckers 

 without horny rings but distally even these are lost. There is a low 

 ridge medially between the rows of suckers. 



The tentacles are compressed, keeled aboraUy, the keel expanded 

 on the hand and extending to the tip of the club. The oral surface 

 is rounded, but midway from the base to the club it becomes flattened, 

 the flat portion roughened and terminating proximally in a slender 

 point. This flattened portion is broad in the carpal region and its 

 borders extend around the club as wide trabeculate protective mem- 

 branes. The suckers are quadriserial. On the hand the suckers 

 of the inner rows are about twice as large as those of the marginal 

 rows; distaUy the suckers become uniformly smaU in the attenuate 

 portion of the club. The large suckers of the hand have about 15 



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