[233] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 
Figure 2d.—The same. One of the suckers from the middle of a lateral arm; front 
view ; much enlarged. 
Figure 2e.—The same. Three rows of teeth on the radula, in their natural posi- 
tions ; enlarged nearly 50 diameters. 5 
PLATE XXIII. 
Histioteuthis Collinsii Verrill. Side view of the head and arms; from the preserved 
specimen ; ? natural size. Drawn by J. H. Emerton. 
PLATE XXIV. 
Figure 1.—Desmoteuthis hyperborea V. Ventral view of a female; } natural size. 
Figure 2.—The same specimen. Dorsal view of the head and arms. Part of the arms 
are imperfect. 
Figure 2a.—The same. One of the arms, left of the third pair; natural size. 
Figure 2b.—The same. One of the larger suckers from the middle of third pair of 
arms; front view; enlarged 8 diameters. 
Figure 3.—Histioteuthis Collinsii V. Original type. One of the tentacular arms; 
front view; } natural size. 
Figure 4.—Beak of the same specimen; a, upper; b, lower mandible; natural size. 
Figure 5.—Suckers of the same specimen; a, side, and a’, front view of one of the 
larger suckers of lateral arm; 8, side, and b’, front view of a distal sucker; enlarged 
2}¢ diameters. 
Figure 6.—The same specimen. Teeth of the odontophore ; isolated and enlarged 25 
diameters; a, median; 5b, inner lateral; c, and d, outer laterals; e, marginal plate ; 
h, g, and f, other views of the lateral teeth. The teeth are not drawn in their natu- 
ral positions. 
Figure 7.—The same specimen. Teeth on the radula in their natural positions; en- 
larged 22 diameters. 
Figure 6 is from a camera-lucida drawing by the author. 
PLATE XXV. 
Figure 1.—Desmoteuthis hypoborea Verrill. Female; about 4 naturalsize. Specimen 
opened on the ventral side. M, mantle; F, caudal fin; P, P’, posterior part of pen ; 
c, ¢, eyes; d, siphon; do, aperture of same; ad’, base and posterior entrance of same ; 
f', commissure attaching the siphon to the mantle laterally; g, g, gills; 1, ink-sac ; 
S/, first stomach, or gizzard; S, S, lobes of stomach; 8’, cecal lobe; 1, 1, long, tu- 
bular intestine, plicated within, and with clusters of follicular glands externally 
along the sides; h, rectum; j, liver; H, systemic heart or ventricle; 60, branchial 
efferent vessels; a, u, branchial auricles; v c’’, posterior vena-cava; 7’, renal or- 
gans; ov, ovary; ov’, some ovules larger than the rest; op, op’, right and left ovi- 
ducts; «’, nidamental glands of the oviducts; x, xa’, accessory nidamental glands. 
From a somewhat mutilated specimen. 
Figure la.—The same. Pen; ventral view; 4 natural size. 
PLATE XXVI. 
Figure 1.—Loligo Pealei Lesueur. Female from Vineyard Sound. Ventral view; # 
natural size; 1, dorsal arms; 2, 3, 2d and 3d lateral arms; 4, ventral arms; ¢, ten- 
tacular arms; a, ventral olfactory crests around the ear; ¢, eye; p, aquiferous pore; 
8, siphon. 
Figure 2.—The same. Tentacular arm of a large male; enlarged 14 diameters. 
Figures 3, 3a.—Front and side views of the hectocotylized left ventral arm of a male, 
showing the sexual modifications of the suckers and their peduncles, toward the 
tip; enlarged 14 diameters. 
