A. E. Verrill — North American CephalopocJs. 229 



lateral insertions, 5''" (2 inches); breadth of body, 11-9""; circum- 

 ference of body, 29'2'^"' (11-5 inclies). 



The body is stout, acuminate posteriorly ; the anterior border of the 

 mantle, beneath, is even, and not distinctly emarginate in the middle. 



The caudal fin is large, broad, transversely rhomboidal, but neither 

 so broad uor so large pi'oportionally as in S. megciptera. The siphon 

 is very large and broad, (63""" long by 50 broad), with a large aper- 

 tui-e, 25'"'" wide. The eye-balls are very large, elongated, measuring, 

 although somewhat collapsed, about 42'"'" long by 31'""' broad. The 

 eye-openings, as distended, are large, oblong, elliptical, with a broad 

 sinus, and slightly thickened edges. 



The ai-ms are stout and rather long, the third and ventral pairs 

 being nearly equal in length ; those of the second pair are about 

 12'o'""' shorter than those of the third; the dorsal ones about 63"'"' 

 shorter than those of the second. The dorsal arms are 18*4''"' long, 

 trapezoidal in form, the outer face convex and about r9"" broad ; 

 the lateral and inner faces, 1-2'^'"; along the inner angles there is a 

 narrow membrane, outside the suckers. Those of the second pair are 

 24-7'^'" in length ; their transverse breadth is about 2'^'" ; from inner 

 face to outer angle, 1'9'"' ; along the outer angle, in these, is a thick 

 acute-edged crest, widest in the middle of the arm ; along the lower 

 inner angle, outside the suckers, there is a broad and very thin mem- 

 brane, 2*5'^^'" or more in width ; along the upper inner angle, is a 

 similar membrane, about •6'^^'" wide. 



The arms of the third pair are 26''" long, (31'^'" from center of eye 

 to tip of arms) ; they are compressed, 2*25"" broad at base; on the 

 outer angle, along the middle, there is a very prominent crest, so 

 that, in this part, the distance from inner face to outer angle, is 4'"' ; 

 along the lower-inner angle there is a very broad, thin, delicate web, 

 where widest at least 5 to 7"" (2 to 2*75 inches) wide, (it is consider- 

 ably torn and may have been still wider) ; it is widest beyond the 

 middle of the arm ; on the upper-inner angle the corresponding mem- 

 brane is about O-e'^'" wide. Transverse, thick, fleshy ridges run out 

 from between the suckers a short distance on these membranes, and 

 then fade out. The ventral arms are 2-25'^™ broad at base, and trape- 

 zoidal ; they have a smaller crest along the outer angle, and a narrow 

 membrane along each inner angle. 



All the sessile arms bear similar suckers, all of which are provided 

 with 7 to 13 large, very acute, incurved teeth on the outer margin of 

 the very oblique, horny rings, and with much smaller, sometimes 

 rudimentary ones on the inner margin, much as in S. megaptera. 



