[ 101 ] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 
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 laminae, 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 turns 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, expanded 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 membraue 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; they are about 
1.5 mm in diameter, circidar, 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 
