A. E. Ye’reill — North American Cephalopods. 
423 
tentacular arms are also injured and most of the large suckers of the 
clubs are destroyed ; the caudal fin was not only torn by handling, 
but one-half of it had, apparently, been destroyed and the wound 
healed before the death of the creature,* so that its true form cannot 
be determined ; the eye-balls were burst ; and most of the pen was 
gone. 
The head, eye-lids, siphon, and front edge of the mantle are, how- 
ever, in fair condition, and as these parts have not been well preserved 
in any of the previous examples, some new and valuable facts were 
learned in regard to the structure of those parts. Many of the fol- 
lowing characters are of generic value. 
The eye-lids were large, not much thickened, and only slightly 
angulated, and with a shallow sinus ; diameter of opening 120 mm 
(4-5 to 5 inches). The transverse nuchal crests, behind the eyes, are 
distinct, but only slightly elevated ; of the longitudinal ones only 
one, on each side, is distinct but is short and not very high, the others 
(unless they had been rubbed off) are rudimentary. The siphon is 
large and broad; aperture 102 mm (4 inches) broad, slightly bilabiate, 
with a broad valve within ; dorsal bridles moderately developed. 
Siphon-pit shallow, smooth. Connective cartilages on base of the 
siphon simple, long-ovate, slightly oblique, and only a little concave. 
Connective cartilages on the sides of the mantle, short and close to 
the front edge, very simple, consisting of a simple, slightly raised, 
longitudinal ridge. The dorsal angle of the mantle-edge extends 
considerably forward, as an obtuse angle ; the lateral angles are also 
distinct. The body is large and broad in the middle and anteriorly, 
but tapers very rapidly to the base of the caudal fin, which is rela- 
tively small. 
This specimen, when examined by me, measured as follows: length 
of mantle to lateral angles of the front edge, 4T6 feet; from edge 
of mantle to anterior base of ventral arms, 1*25 feet; circumference 
of body, 4 feet ; length of caudal fin, tip to end of lobe, 1 -75 ; breadth 
of one-half, measured from median line, 8 inches ; length of tentacu- 
lar arms, 15 feet; of the club, 2 feet; from first of the large suckers 
to tip, T67 feet; length of ventral arms (minus tips), 4'06 feet; their 
circumference at base, 8*5 inches; length of the dorsal arms (minus 
tips), 4-5 feet; their circumference at base, 75 inches; circumference 
of 2d pair of arms, at base, 7 - 5 inches; of 3d pair, 8‘5 inches; diame- 
* Owing to this fact, which was not understood by those who saw and figured it, 
at first, some of the cuts that have been printed give the tail very peculiar and 
remarkable forms. 
