[101] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 311 



total length of the body and head being but 19 inches. Body relatively 

 short and thick. The caudal fin is remarkably' large and broad; it is 

 more than twice as broad as long, and the length is about half that of 

 the body. Its form is nearly rhombic, with the lateral angles produced 

 and rounded and the posterior angle very obtuse, the posterior edge, 

 as preserved, being slightly concave. 



The ventral anterior edge of the mantle is concave centrally, with a 

 slight angle on either side, about .75 inch from the center. From these 

 angles it is again concave to the sides. On the dorsal side the edge ad- 

 vances farther forward than beneath, terminating in a slightly promi- 

 nent obtuse angle in the middle of the dorsal edge. The nuchal crests 

 around the ear consist of a slightly elevated transverse ridge, with three 

 thicker and much more elevated lamina?, which extend forward, on the 

 head, one in the median line of the eye, with one above and one below 

 it, the lower one longest and least elevated, curving downward beneath 

 the head. The two upper ones are broadly rounded at top. Behind 

 the transverse fold there is a deep, irregularly crescent-shaped fosse. 

 The eye-sockets are large, oblong, and furnished with distinct lid-like 

 margins. The eyes are large, prominent, oblong, and naked ; the an- 

 terior portion is swollen laterally on both sides. The short arms are 

 trapezoidal, the dorsal ones somewhat (about 1.25 inches) shorter, and 

 smaller than the others, which are nearly equal in length, the second 

 pair being stouter than the rest and a little longer. The dorsal arms 

 have a slightly prominent membrane along the outer angles ; the sub- 

 dorsal or upper lateral arms are narrowed to an acute edge or crest on 

 the outer angle, but on the inner angle have a broad, thin, marginal 

 membrane outside the suckers. The lower lateral arms are similar in 

 size and form, and also have a very broad, lateral, marginal membrane 

 next to the suckers, on the lower side. The ventral arms are more 

 slender and a trifle longer, and have narrower marginal membranes. 

 The tentacular arms are slender, elongated, txpanded toward the tip, 

 and have suckers arranged much as in the gigantic species, even to the 

 smooth-edged suckers and opposing tubercles proximal to the large 

 suckers, as I have described them in Architeuthis Harveyi. The sucker- 

 bearing portion is margined by a scalloped membrane on each side. 



The small proximal suckers of the tentacular arms occupy about 44.5 m " 

 (1.75 inches) at the commencement of the terminal club j they are about 

 1.5 mm in diameter, circular, regularly cup-shaped, with a nearly even, 

 smooth rim; they are raised on slender pedicels. Alternating with 

 these are smooth, rounded tubercles, which are also on pedicels and 

 slightly larger than the intervening suckers. There are four suckers 

 and four tubercles in the row along the inner margin ; along the outer 

 margin there are fewer, smaller suckers, but without horny rings ; if 

 they originally had such rings they were probably smaller than the 

 others. The large suckers (Plate XVI, fig. 9) forming the two central 

 rows on the terminal club are furnished with a somewhat oblique dark 



