60 U.S. NATIONAL MUSEUM BULLETIN 234 



shielding the eyes. Ventrally, the margin is produced, nearly cover- 

 ing the funnel and is not, or is only slightly, sinuous. In the males, the 

 mantle is distinctly widest at the margin which flares outward bell- 

 like. In the females, the sides are straighter, the margin is not flared, 

 and there is a widening posteriorly. 



The flns are small, nearly circular, and strongly auriculate ante- 

 riorly, not at aU so posteriorly, with narrow bases. They originate 

 at about the midpoint of the mantle. 



The funnel is small, stout basally, with a slender anterior section 

 which is free for most of its length. In the female examined, the 

 funnel organ difi"ers somewhat from that of the male in that the dorsal 

 member is V-shaped in the female but U-shaped in the male, the 

 ventral pads broad in the female, rather narrow and compact in the 

 male. The mantle-funnel locking apparatus is somewhat peculiarly 

 formed. The funnel member is a short deep groove bluntly rounded 

 at each end. The mantle member is a long slender ridge, slightly 

 curved, and partially divided in the middle. The posterior half fits 

 within the funnel groove, whereas the anterior half projects forward 

 and appears to lie against the funnel adductor. 



The head is small and compact, almost as wide as the mantle. It 

 bears large eyes with small pupils and with small but distinct eyelids. 

 There is a small pore posterior to and ventral to the eye. The head 

 is flattened ventrally and shallowly excavated to include the funnel. 



The arms are in the general order 3 = 2.4.1 or 3=2.1.4. The arms 

 are rather long, rounded aborally and mth the exception of IV have 

 narrow but well-defined aboral keels extending over the greater length 

 of the arms. The suckers are biserial, on short pedicels, and are not 

 equipped with protective membranes. In the females there are about 

 18 pairs of round suckers on II and III. The suckers of the arms are 

 barrel-shaped, laterally inserted, with round apertures without teeth. 

 In the male the suckers are small and evenly distributed. Arm III 

 is slightly stouter than the others and curves slightly inward. 



In the males the suckers are in general all larger than in the female 

 but in addition on I, II, and III the suckers of the ventral row for most 

 of its length are greatly enlarged and about a half larger than those 

 of the dorsal row. On IV the suckers of both rows are somewhat 

 enlarged, the ventral ones a little larger than the dorsal ones. The 

 suckers of III are not so enlarged as on the other arms. In the males, 

 III is much stouter than the others and strongly turned inward. 



The left dorsal arm is hectocotylized in the males by a tremendous 

 broadening of the basal half of the arm containing a deep excavation, 

 the sides of the excavation inrolled along the edges. The dorsal 

 edge is entire but the ventral one is deeply cut in, the proximal and 

 distal sections forming lobes. The proximal edge terminates at the 



