302 
A. K. Verrill — North American Cephalopods. 
Leachia Lesueur, 1821* (= Perot his (Esch.) Katlike, 1835), was also 
based on an imperfect figure of a small Pacific Ocean squid, which 
had likewise lost its tentacular arms. The only generic character 
given was, as in Lamarck’s case, the presence of only eight arms, — a 
purely fictitious character. The type of this genus was Leachia 
cyclura Les. It has a more elongated body, slender posteriorly, 
with a more or less rounded caudal fin, the two sides of the fin com- 
pletely united together and to the posterior end of the body. The 
third pair of arms is much larger than the others. The anterior dor- 
sal edge of the mantle is represented as free, in all the figures, but, 
according to D’Orbigny, there is an internal, dorsal commissure, and 
also two lateral ones. The visceral anatomy of one species of this 
group (L. guttata Grant), which D’Orbigny refers, probably cor- 
rectly, f to the original L. cyclura , is pretty well known, and is widely 
different from that of Desmoteuthis (see PI. XXXIX, fig. 1), as well as 
from that of Taonius , so far as the latter is known. 
There can be no doubt whatever as to the generic distinctness of 
Leachia , if the anatomy be taken into account. (See the figures of 
Grant and D’Orbigny.) 
Taonius Steenstrup, 1861, (type T. pavo). This differs from the 
two preceding genera in its more elongated form, narrow caudal fin, 
etc. From Leachia and Desmoteuthis it differs in the form of its 
pen. The dorsal edge of the mantle is represented and described 
as free by D’Orbigny. The anatomical characters are not known. 
Desmoteuthis hyperborea Verrill. 
Leachia hyperborea Steenstrup, Kongelige Danske Vidensk. Selsk. Skrifter, 5 r., 
iv, p. 200, 1850 (sep. copies, p. 16). 
Taonius hyperboreus Steenst., Oversigt Kgl. Danske Vidensk. Selsk., Forhandlin- 
ger, 1861, p. 83. 
Verrill, Amer. Journ. Sci., xvii, p. 243, 1879; xix, p. 290, 1880. 
Loligopsis hyperboreus Tryon. op. cit., p. 162 (inaccurate translation, after Steen- 
strup). 
Plate XXVII, figures 1, 2. Plate XXXIX, figure 1 (anatomy). 
$ . Body very long, tapering gradually backward, and ending in 
a long, slender, acute tail ; mantle soft and flabby, with a capacious 
branchial cavity; anterior dorsal edge advancing somewhat in the 
* Journal Philad. Acad., ii, p. 89, pi. 2. 
f Tryon criticizes this determination, because Lesueur ‘‘describes and figures a 
smooth species,” while L. guttata has two rows of curious tubercles on the ventral side. 
But as Lesueur only described a figure of the. dorsal surface , his objection to this identi- 
fication is absurd. 
