A. E. Verrill — North American Cephalopoda. 
251 
Sessile arms toith hooks only. 
Verania. — Tentacular-club with suckers only ; sessile arms with 
hooks only. 
Acanthoteuthis. — Tentacular and sessile arms with hooks (fossil). 
Ancistrocheirus. — Tentacular and sessile arms with hooks in two 
rows. Pen dilated at both ends. 
Enoploteuthis (typical). — Tentacular-club with two rows of hooks, 
and with a cluster of small suckers on the wrist. Sessile arms all 
with hooks in two rows, extending to the tips. 
It will be evident from these characters, that Mr. Dalbs species, 
having two rows of smooth slickers, at least on the basal portion of 
the ventral arms, can belong to none of these genera, except those in 
the first group and Lestoteuthis in the second. Of these, Goncitus 
would be excluded from consideration by its different pen and four 
rows of suckers; Onychia and typical Onychoteuthis by the form of 
the pen. After this elimination we still find three generic groups to 
either of which it might belong, so far as its armature is known, viz: 
Ancistroteuthis , Dosidicus , and Lestoteuthis. The first of these is, 
perhaps, nothing more than a sub-genus of Onychoteuthis , the princi- 
pal difference being in the pen, which is somewhat pennate and 
lanceolate in the typical species of the latter, but nearly linear with 
a solid cartilaginous terminal cone in the former. In this last char- 
acter, and in the general form of the pen, O. rohusta somewhat 
approaches A. Lichtensteinii. But Dosidicus and Lestoteuthis also 
have a solid cartilaginous cone, and the latter, especially, agrees 
most closely in the general form of the body and caudal fin ; and its 
pen has very nearly the form and structure seen in 0 . rohusta. 
So far as we can judge, therefore, with our present imperfect data, 
the relationship of 0 . rohusta appears to be rather with Lestoteuthis 
than with any other known group. It is possible, however, that its 
affinities may prove to be closer to Ancistroteuthis , when the arma- 
ture is discovered. 
J,estoteuthis , gen. nov. 
The characters of Lestoteuthis Kamschatica , which I propose to 
take as tlie type of this generic group, are not yet fully known. The 
peculiarities in the armature, both of the sessile and tentacular-arms, 
as given above (p. 250 ) are quite sufficient, however, to warrant its 
separation from all the other genera. Its pen, as figured, also differs 
from all others, hitherto described. It is narrowest anteriorly, 
gradually and slightly expanding backward to the one-sided conical 
