[233] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 443 



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 nea»ly 50 diameters. 



Plate XXIII. 



Sistioteuthis Collinsii Verrill. Side view of the head and arms ; from the preserved 

 specimen ; £ natural size. Drawn by J. H. Emerton. 



Plate XXIV. 



Figure 1. — Desmoteuihis hyperhorea V. Ventral view of a female ; J uatural 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 2&. — The same. One of the larger suckers from the middle of third pair of 

 arms; frout view; enlarged 8 diameters. 



Figure 3. — Sistioteuthis Collinsii V. Original type. One of the tentacular arms ; 

 front view ; £ natural size. 



Figure 4. — Beak of the same specimen ; a, upper ; V, 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 ; o, side, and V, front view of a distal sucker; enlarged 

 2J diameters. 



Figure 6. — The same specimen. Teeth of the odontophore ; isolated and enlarged 25 

 diameters ; a, median ; h, inner lateral; c, and d, outer laterals ; e, marginal plate : 

 h, g, and/, 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 hypooorea Verrill. Female ; about •$ natural size. Specimen 

 opened on the ventral side. M, mantle ; F, caudal fin ; P, P', posterior part of pen ; 

 c, c, eyes; d, siphon; d o, aperture of same ; d", base and posterior entrance of same; 

 /', commissure attaching the siphon to the mantle laterally; g, g, gills; i, ink-sac ; 

 S', first stomach, or gizzard ; S, S, lobes of stomach ; S", ccecal lobe ; I, I, 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; ho, branchial 

 efferent vessels ; a, v, branchial auricles ; v c", posterior vena-cava ; r', renal or- 

 gans; ov, ovary ; ov 1 , some ovules larger than the rest ; op, op', right and left ovi- 

 ducts; x', nidamental glands of the oviducts; xx, xx', accessory nidamental glands. 

 From a somewhat mutilated specimen. 



Figure la. — The same. Pen ; ventral view ; ^ 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; t, ten- 

 tacular arms ; «, ventral olfactory crests around the ear ; e, eye ; p, aquiferous pore ; 

 s, siphon. 



Figure 2. — The same. Tentacular arm of a large male ; enlarged 1J diameters. 



Figures 3, 3a. — Front and side views of the hectocotylized left ventral arm of a male, 

 showing the sexual modifications )f the suckers and their peduncles, toward the- 

 tip ; enlarged 1£ diameters. 



