A. E.Verrill — North American Cephalopods. 439 



Figure 5a. — Posterior end of the same pen. 



Figure 6. — The same specimen. Connective cartilage from base of the siphon, natural 



size. 

 Figure 7. — The same specimen. Transverse sections of arms; a, of dorsal; 6, of 2d 



pair ; c, of third pair, natural size. Tlie suckers are omitted. 

 Figure 8. — The same specimen. Rims of suckers of sessile arms, enlarged \\ diameter ; 



a, a', side and front views of the 15th and 13th sucker of a ventral arm; &, 6', 



side and front view of one of the largest suckers of a lateral arm ; c, c/. a dorsal 



sucker of a dorsal arm. 

 Figure 9. — Part of border of one of the larger suckers (12th) of the second pair of 



arms, more enlarged, showing part of the dentate edge of the horny rim, with 



a portion of the circle of small plates, attaclied to the membranous border. 

 Figxire 10. — Octopus Bairdii V. Spermatophores. A, one with the inner sac [S) 



partly extruded ; i, the point from which the extension commences, natural size • 



B, another spermatophore in its original condition; re, filament at large end; 6, 



filament at small end. 



Plate XXX Y II. 

 Figure 1. — Loligo Pealei Les. Female specimen from Vineyard Sound. Pen. natural 



size and represented as flattened to show the full width of the thin portion. 

 Figure 2. — Loligo Pealei, var. lorealis. Female specimen, from Annisquam, Mass. 



Pen, natural size, represented in the same manner. 

 Figure 3. — Loligo Pealei. Pen of a young specimen from Vineyard Sound, natural 



size. Represented in the same way. 

 Figure b.—Histioteuthis Collinsii V. Teeth of the odontophore, isolated and enlarged 



25 diameters ; a, median ; &, 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 natural positions. 

 Figure 6. — Loligo ■pallida V. Part of teeth of the odontophore, enlarged 50 diameters ; 



a, median tooth, front view ; c, next to outer lateral teeth : d, outer lateral teeth ; 



e, marginal plates ; all are in their natural positions, except a. 

 Figure 7. — Sthenoteuthis pteropus V., from Bermuda. Isolated teeth from odontophore, 



enlarged 25 diameters; a. median teeth, front view; &, inner lateral ; c, middle 



lateral; rf, outer lateral tooth. 

 Figure 8. — Ommastrephes illecebrosus Les., from Eastport, Me., part of the teeth of the 



odontophore in their natural positions, enlarged 25 diameters; a. median teeth; 



h and 6', inner lateral teeth; c, middle lateral teeth ; c?, outer lateral teeth. 

 Figure 9. — Loligo Pealei, var. pallida V. Female, from Ansonia, N. Y. Tenth 



sucker of the third pair of arms ; a, lateral, and &, front view, enlarged 2 



diameters. 

 Figure 10. — The same. Male, from Ansonia. Suckers enlarged 2 diameters; a, front 



view of tenth, from third arm : h, side view of same ; c, side view of horny rim 



of fifth large sucker of tentacular club; d, front view of the same. 

 Figure 11. — Loligo Pealei, var. pallida. Female. (Same specimen as figure 9.) 



Fifth large sucker of tentacular arm ; e, side, and /, front view. Enlarged 2 



diameters. 

 Figures 5-8 are from camera-lucida drawings by the author ; the others are by J. 

 H. Emerton. 



