106 U.S. NATIONAL MUSEUM BULLETIN 234 



Posteriorly the sides commence converging at the anterior margin'^of 

 the fins demarcated by a distinct angle, and thence the mantle tapers 

 cone-shaped to a blunt point which is partly free from the fins. The 

 anterior margin is only slightly produced in the dorsomedian line but 

 is emarginate below the funnel. 



The fins are short (49.0-39.6) and fairly narrow, their anterior 

 margins convex with anterior lobes free, the posterior margin slightly 

 concave. Posteriorly they unite to form a narrow drawn-out point. 



The funnel is strong, compact, and deeply set into the ventral surface 

 of the head. The mantle locking apparatus is straight and simple. 

 The funnel member is narrow anteriorly, expanding posteriorly, and 

 terminates in a rounded tip. The ventral margin of the groove is 

 straight, the dorsal edge slightly bowed, the groove deeper in the 

 midportion. The mantle member is straight and narrow. The 

 funnel organ is an inverted V with broad lateral members: the 

 ventral pads are elongate-oval and angled. The funnel valve is large 

 and strong. 



The head is wider than the mantle, with small eyes which project 

 slightly. The eyelids are very narrow, transversely open with a 

 small but distinct anterior sinus. It is interesting to note that in 

 this specimen the dorsal windows over the eyes are very distinct and 

 nearly round. There are four nuchal folds on either side of the 

 funnel, widely spaced, with the ventral fold immediately adjacent to 

 the funnel. No olfactory crest is observable. The buccal membrane 

 is eight-lobed and has eight supports. 



The arms are long and comparatively slender, in the order 3.4.2.1, 

 4.3.2.1, or 2=4.1.3. The dorsal arms are shortest, smooth at their 

 bases but keeled for about two-thirds of their length by a low sharp 

 ridge. The right arm bears eight pairs of hooks, the left arm nine, 

 arranged in two rows terminating distally in two rows of about six 

 pairs of small suckers, beyond which the tip bears four rows of 

 minute suckers. The hooks and suckers are bordered on each side 

 by a protective membrane, the ventral one the deepest, and the 

 supports alternate with the hooks. 



The dorsolateral arms bear a ridge on the distal half of the arm 

 and each bears nine pairs of hooks followed by about five pairs of 

 suckers terminating in four rows of minute suckers on the distal 

 tip. A protective membrane borders the hooks and suckers, the 

 larger on the ventral side. 



The ventrolateral arms are connected with the dorsolateral arms 

 by a vestigial external web at their bases and with the ventrals by 

 the normal thin membrane which aids in sheathing the tentacular 

 stalk. A broad swimming membrane originates at the base of the 

 arms and extends to the distal tip. Both arms bear nine pairs of 



1 

 I 



