A. E. Verrill — Earth American Cephalopoda. 
437 
Plate XXVIII. 
Figure 1. — Ommastrephes illecebrosvs V. Youug male from Provincetown, Mass. 
General figure of ventral side, f natural size ; la, club of the right tentacular 
arm, front view, enlarged If. 
Figure 2. — The same. Club and part of tentacular arm, of a larger ? specimen, 
enlarged If diameters. 
Figure 3, 3a. — The same. Hectocotylized right ventral arm of a large male specimen, 
from Eastport, Me., showing the sexual modification of the suckers and their 
peduncles toward the end of the arm : 3 a transverse section of the modified por- 
tion of the same. 
Figure 4. — The same. Pen of a young specimen ; f natural size. 
Figures 5 and 5a.— The same. Side and front views of a large sucker of the lateral 
arms, enlarged 3f diameters. 
Figure 6 and 6a. — Side and front views of a smaller, distal sucker of the lateral arms. 
Figure 7. — The same. 2 Side view of the horny ring of one of the largest suckers 
of the club, enlarged 3f diameters. 
Plate XXIX. 
Figure 1. — Loligo Pealei Lesueur. Female from Vineyard Sound. Ventral view, f 
natural size; 1, dorsal arms; 2.3. 2d and 3d. lateral arms ; 4, ventral arms ; t, 
tentacular arms; a, nuchal olfactory crests, about the ear; e. eye: p, aquiferous 
pore ; s, siphon. 
Figure 2. — The same. Tentacular arm of a large male, enlarged If diameters. 
Figure 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 If diameters. 
Figure 4. — The same. Female. Fronc view of the beak and buccal membraues, 
natural size : m, mandibles ; f inner fold ; /. second fold of the buccal membrane ; 
a, dorsal ; b, c, lateral : d. ventral angles of the outer buccal membrane, with 
their small suckers ; s. peculiar horse-shoe shaped tubercle, or sucker, for the 
attachment of the spermatophores. during copulation. 
Figure 5. — Ommastrephes itlecebrosus. Side view of the head and siphon, after 
removal of part of the mantle, f natural size ; 1. 2, 3, 4. bases of 1st to 4th pairs 
of sessile arms; t a, base of tentacular arm; m , mantle; b, b'. olfactory crests 
around the ear ; d , siphon ; f f, the connective cartilages for attaching it to the 
mantle. 
Figure 5a. — The same. Lateral connective cartilage, or ‘button’ on the inside of the 
mantle, which fits closely into the cartilage pit (/) on the base of the siphon. 
Plate XXX. 
Figure 1. — Rossia Hyatti Verrill. Female. Ventral view of the head and arms, en- 
larged 3 diameters. 
Figure 2. — Rossia sublevis VerrilL Female. Ventral view of the head and arms, 
enlarged 3 diameters. 
Plate XXXI. 
Figure 1. — Rossia Hyatti. Dorsal view, enlarged If diameters. 
Figure 2. — The same. A young specimen, enlarged If diameters. 
