CEPHALOPODS OF THE PHILTPPINE ISLANDS 121 



on the mantle, the anterior borders separated but united posteriorly. 

 On the average, the posterior median border slightly overreaches 

 the end of the mantle. In the smaller specimens they overreach the 

 mantle end by about a fourth of their length; in the largest ones the 

 mantle end and the posterior border of the fins are of equal length. 



The arms are long, somewhat subequal, II and III about equal in 

 length, I and IV shortest. Arms I and II are rounded aborally, 

 with a low keel on the distal third, III with a well-developed and 

 deep swimming membrane orginating a quarter of the length from 

 the base and extending as a high membrane to about the midpoint 

 of the arm where it becomes a low membrane and extends outward 

 as almost unnoticeable to the tip. All the arms are equipped with 

 dorsal and ventral protective membranes which however are very 

 undeveloped and inconspicuous. The suckers are in two rows, round, 

 laterally mserted on short delicate pedicels and with lateral openings. 

 The apertures of the large suckers, extending over more than two- 

 thirds of the length of the arms are completely smooth and round. 

 Distally the small terminal suckers have five to eight small blunt 

 teeth on the distal border. 



The tentacles are long, slender, strongly compressed, and bear 

 small, broadly expanded clubs which are attenuate on their distal 

 half. The club is bordered on either side by a protective membrane 

 originating at the carpus and extending distad to the tip. On the 

 aboral surface of the attentuated half is a low swimming membrane, 

 about half the length of the club. There is no cleft on the aboral 

 surface of the club. 



The carpal connectives orginate about a club length below the 

 carpus as a single sucker on the ventral side. Following this is a 

 single row of alternating pairs or single pads and suckers which cross 

 to the dorsal side and, with a break at the base of the club, extend 

 as a straight row of alternating pads and suckers along the dorsobasal 

 line of the club. 



The suckers of the hand portion of the club are in six to seven 

 longitudinal series distinctly larger than those of the attenuate half. 

 The suckers of the four median rows are larger than the margmals 

 but not so abruptly larger as in C. reversa Verrill. The large median 

 suckers bear 28 to 32 sharp pointed teeth on the horny ring. These 

 teeth are usually smaller and straight on the anterior half of the ring, 

 heavier, longer, and curved inward on the posterior half. The 

 suckers of the two ventral rows and a few of the proximal suckers of 

 the median rows have the papiUated collar surrounding the horny 

 ring curiously broadened and elongated on the ventral side, forming 

 a shelf or plate. In those of the ventral row the shelf may be broader 

 than the actual aperture of the sucker. 



