396 REPOKT OF COMMISSIONER OF FISH AND FISHERIES. [186] 



The jaws (Plate XLII, fig. 3) b^ave rather blunt, slightly incurved 

 tips, with the angle at the bases of the cutting edges round and without 

 any distinct notch. The odontophore (Plate XLII, fig. 4) has a median 

 row of large, acute teeth with broad bases, without lateral denticles; 

 the inner lateral teeth are much smaller, with curved, acute-triangular 

 points; outer lateral teeth longer and more acute; marginal plates 

 large and distinct. 



Siphon large, tapering, capable of being bent in all directions, so as 

 to be used for swimming either forward, backward, or sideways, accord- 

 ing to its direction. 



Arms subequal, relatively short, stout, tapering to slender points, 

 connected for about one-third of their length by a web, which extends 

 as a narrow membrane along their margins to near the ends. Suckers 

 small, not crowded, alternating pretty regularly in the two rows : in 

 the original type-specimen, which was not full-grown, the arms of the 

 first pair each had about sixty-five suckers ; those of the fourth pair 

 about sixty. In a larger example ( 9 ) the dorsal arms have about 94 

 suckers; the third pair about 100; the ventral ones about 90. 



In the male, the right arm of the third pair has its terminal portion, 

 for about a third of its entire length, modified for reproductive purposes 

 into a large spoon-shaped organ (Plate XLI, fig. la), broadly elliptical 

 in outline, witli the sides incurved, and the end somewhat trilobed : inte- 

 rior deeply concave, with ten to twelve, and occasionally, in the largest 

 examples, thirteen elevated transverse folds; at the base, there is a fold 

 bent into an acute angle, the apex directed forward, leaving a deep V 

 shaped sinus behind it, which is a continuation of a shallow groove, 

 formed by a thickening of the web along the lower side of the arm. and 

 terminating midway between it and the fourth arm. At the end. the 

 arm terminates in a small conical tip, between the two broadly rounded 

 lobes of the spoon-shaped organ ; at the base of this organ there is a 

 slight constriction; the basal portion of the arm bears 30 to 37 suckers, 

 like those on the other arms. The modified portion of the arm is con- 

 siderably longer than the distance between the constriction at its base 

 and the interbrachial web, and about equal to one-half the total length 

 of the part which bears suckers. The corresponding arm on the left 

 side is of the ordinary form, and has, in medium-sized examples, about 

 51 suckers. 



The female differs but little from the male, externally, except in lack- 

 ing the modification of the third right arm. 



Some of the larger females were filled with mature eggs. These are 

 large and rather numerous, occupying a large part of the interior of the 

 body. They are enclosed in long-pyriform sacs, with the small end taper- 

 ing to a filiform point, by which they adhere. 



Length of the original male specimen, in alcohol, exclusive i 

 arms, 44 mm ; breadth of the body, 31 mm ; between eyes, 18 mm ; length 

 of arm, of the first pair, from mouth, 57 mm ; from mouth to edge of web, 





