A. E. Yen-ill — North American CephaZopods. 
359 
fins ; outer part of fins translucent white ; anterior edge of mantle 
with a white border. 
Pen small and very thin, soft, and delicate. It is angularly- 
pointed or pen-shaped anteriorly, the shaft narrowing backward ; a 
thin lanceolate expansion, or margin, extends along nearly the 
posterior half (PI. XL VI, fig. 2b). 
Upper jaw with a sharp, strongly incurved beak, without a notch 
at its base. Lower jaw with the tip of the beak strongly incurved, 
and with a broad, but prominent, rounded lobe on the middle of its 
cutting edges (fig. 2c). 
Odontophore with simple, acute-triangular median teeth ; inner 
laterals simple, nearly of the same size and shape as the median, 
except at base ; outer laterals much longer, strongly curved forward 
(fig. 2d.) 
Length of body 25 to 40 mm . One of the larger males measures, in 
alcohol, from the posterior end of the body to the dorsal edge of the 
mantle, 21 mm ; to the free bases of the dorsal arms, 48 mm ; to the inter- 
val between bases of second and third pairs, 49 mra ; to bases of ventral 
arms, 46 ,nm ; to tip of dorsal arms, 48 nim ; of second pair, 51 mm ; of third 
pair, 49 mm ; of ventral arms, 46 mm ; diameter of largest suckers 
of lateral arms, 2 mra ; length of fin at base, ll mm ; extreme length of 
fin, 15'5 mm ; transverse breadth of fin (lower side), 10 mm ; diameter of 
eye, 9 mm ; breadth of body, below fin, l7 mm ; breadth of head, I7 mm . 
Twenty-seven specimens of this species were obtained by Mr. A. 
Agassiz, on the “ Blake,” in 1880, from six stations, ranging in depth 
from 71 to 233 fathoms. Later in the same season, over 200 specimens 
were secured by the writer and others of the dredging party on the 
United States I’ish Commission steamer “ Fish-Hawk.” It was par- 
ticularly abundant at stations 869, 870 and 871, in about 125 to 192 
fathoms, on the rapidly sloping outer bank, off the coast, under the 
inner edge of the Gulf Stream, where the bottom consists of fine com- 
pact sand, with mud and shells. Both sexes occurred in about equal 
numbers, and also the young, of various sizes. It was also taken in 
considerable numbers at stations 865 to 867, in 65 fathoms; 872 to 
880, in 85 to 252 fathoms. It was also dredged off the mouth of 
Chesapeake Bay, in November, by Lieut. Z. L. Tanner, on the “ Fish 
Hawk,” in 18 to 57 fathoms. 
It is easily distinguished from all the species of Jiossia by the larger 
size of the suckers along the middle of the lateral arms; by the 
inequality of the suckers on the tentacular clubs; and by the peculiar 
hectocotylized condition of the left dorsal arm of the male. The ex- 
