410 
A. E. Yerrill — North American Cephalopods. 
more slender and acute. The margins of the suckers are surrounded 
with small, elongated scales. (PI. LYI, figs. Id, \e.) 
The buccal membrane is thin and much produced, with the angles 
little prominent ; it is attached to the arms by eight thin, but wide, 
bridles, the two superior ones united together near their origin. 
The web between the arms is rudimentary but distinct. The pen (fig. 
la) is very unlike that of C. Yeranyi , as figured and described by 
D’Orbigny. It has a long, narrow shaft of nearly uniform width, and 
a long posterior portion, a little wider than the shaft, corresponding in 
length to that of the caudal fin ; at the commencement, this portion 
expands into narrrow, free, incurved margins, but these unite quickly 
so as to form a long, narrow, angular, tubular portion, tapering to a 
very slender tip ; this portion (la") has a dorsal keel, with a groove 
each side of it, two dorsal angles and a ventral angle along each side ; 
the narrow shaft has a dorsal keel, with the sides bent down abruptly, 
nearly at right-angles, and a little incurved, so as to produce a 
squarish keel above, with a deep angular groove below, while the very 
narrow margins bend outward abruptly (la') ; the shaft increases very 
slightly in width, to near the subacute anterior end, but preserves the 
same form, and there is no distinct dilation of the margin anteriorly, 
such as D’Orbigny figures in the pen of C. Yeranyi, nor does the 
posterior portion resemble his figure, though if split open and flat- 
tened out, it would resemble it more nearly. 
This specimen is an adult male, in the breeding condition, for its 
spermatophore-sac is much distended with spermatophores. The 
color is much like that of C. Yeranyi. It is everywhere thickly 
specked with small, purplish brown chromatophores, except on the 
buccal membrane and the bases of the tentacular arms, where there 
are but few ; the head around the eyes and the end of the siphon are 
darker; a row of very distinct, rather large, round, dark purple spots 
runs along the inner surface of the ventral arms, just outside of, and 
alternating with, the upper row of suckers, which they about equal 
in size. 
Total length, to end of ventral arms, 383 mra ; to end of third pair, 
366 mm ; to end of dorsal arms, 298 m, “; tail to dorsal mantle edge, 
125mm; to t> ase of dorsal arms, 178 mm ; length of dorsal arms, 120 ram ; 
of second pair, 150 mm ; of third pair, 188 mm ; of ventral, 205 mm ; length 
of caudal fin, oO ,nm ; its greatest breadth, 41 mm ; breadth of head at 
eyes, 20 mm ; of dorsal arms, 7 m,u ; of third pair, 10 ram ; of ventral arms, 
13 mm ; of bases of tentacular arms, 3 ,u, “; diameter of largest suckers 
of lateral arms. 2 , 25'“ m . 
