442 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [232] 



Figure 4. — The same. Side view of the hea<i 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; /, /, 

 one of the connective cartilages for attaching it to the mantle. 



Figure 4a. — The same. Lateral connective cartilage, n, on the inside of the mantle, 

 which fits closely into the cartilage pit (/) on the base of the siphon. 



Figures 5 and 5a.— The same. Side and front views of one of the larger suckers of 

 the lateral arms; enlarged 4 diameters. 



Figures 6 and 6a. — The same. Side and front views of a smaller distal sucker of the 

 lateral arms; enlarged 4 diameters. 



Figure 3 is from a camera-lucida drawing by the author. 



Plate XX. 



Figure 1. — Ommastreplies illecebrosus Verrill. Female; less than natural size. Letter- 

 ing as in Plate 19, figure 1, with the following additional letters: o", lower nuchal 

 facet, with the auditory pore ; u, urethreal openings in the peritoneal membrane, 

 communicating between the gill-cavity and the visceral cavity, containing the renal 

 organs, r, r ; v d, lateral pallia! veins, or vense-cavae; o v, ovary; o d,o d', right and 

 left oviducts ; o p, the anterior opening ; o x, x x, nidamental glands. 



Figure 2. — Loligo Pealei, var. pallida. Anatomy of the alimentary canal, &c. ; f nat- 

 ural size. The organs are shown nearly in a dorsal view, except the jaws, which 

 are viewed from the side and in section ; b m, buccal membrane ; s »i, section of supe- 

 rior mandible; i m, of inferior mandible; o d, of odontophore, with teeth ; o e, o e', 

 oesophagus; s g, salivary glands; s d, salivary duct; g I, subcesophageal ganglion; 

 I I, liver; ao, ao, anterior aorta, running parallel with the oesophagus along and 

 through the liver; S, first stomach ; S', second stomach or ccecal .appendage; S", third 

 stomach, strongly plicated within; h, intestine or rectum ; h', anal orifice and papil- 

 lae; i, ink-sac; i', orifice of its duct; H, ventricular heart; bo, cut end of one of 

 the branchio-cardiac vessels; g o, genital artery, going to testicle; so, so, branches 

 of gastric artery; t, testicle or spermary; v d, vas deferens; p r, prostate gland and 

 vesiculse seminales; s s, spermatophore-sac; p, 'penis' or efferent duct. 



Plate XXI. 



Figure 1. — Mastigoleuihis Agassizii Verrill. Dorsal view; slightly enlarged. 

 Figure lb. — The same. Pen ; ventral view ; enlarged 2 diameters. 

 Figure lc. — The same. Side view of the same pen. 



Plate XXII. 



Figure 1. — Callileuthis reversa Verrill. Ventral view; natural size. 



Figure la. — The same. Beak, buccal membranes and base of arms; front view ; nat- 

 ural size. 



Figure lb. — The same. One of the larger suckers from a lateral arm; much enlarged. 



Figure lc. — The same. Pen ; ventral view ; somewhat enlarged. 



Figure 2. — Mastigoteuthis Agassizii Verrill. Front view of the beak, buccal mem- 

 branes (b, d), and bases of the arms; enlarged 2 diameters. 



Figure 2a. — The same. Side view of head, siphon, and anterior part of mantle, 

 showing the cartilage (c), on the inner surface of the mantle, which interlocks with 

 d on the base of the siphon ; e, olfactory (?) papilla near the ear; p, an aquiferous 

 pore (?) ; s, siphon ; t a, base of tentacular arms; 1, 2, 3, 4, bases of corresponding 

 pairs of arms. 



Figure 2&. — The same. Portion from near the end of one of the tentacular arms ; en- 

 larged 16 diameters. 



Figure 2c. — The same. Suckers from the tentacular arm; much enlarged; a, side 

 view ; a' and a", front views. 





