A. IE. Verrlll — North American Cepkalopods. 441 



Plate XL. 

 Figure 1. — Loligo Pealei, var. j>ollida. Male. Ventral view, about f natural size. 

 The mantle has been cut open, a little to one side of the median line ; most of the 

 peritoneal membrane has been removed. C, lower side of head ; M, mantle ; F, 

 caudal fin ; a, lachrymal pore ; &, olfactory crests ; c, eye ; d, siphon, cut open ; 

 d", cavity of siphon; e, valve of siphon ; f, one of the connective cartilages of 

 the siphon ; /' one of the connective cartilages of the mantle, in the form of a 

 ridge, fitting into the siphonal cartilage ; </, gill ; h, termination of the intestine, 

 or rectum; i, ink-snc; i', duct of inU-sac; /, portion of liver, in position; m', m'l 

 muscular columns connecting the head and siphon with dorsal portion of the 

 body; H, systemic heart, or ventricle, crossed by the artery of the ink-sac; 

 ao, bulbous base of anterior aorta ; o, ventral pallial artery, or median branch of 

 the posterior aorta, supplying the ventral parts of the mantle ; o\ one of the 

 caudal arteries or lateral branches of the posterior aorta going to the caudal fin 

 and posterior parts of the mantle ; au.au, branchial auricles ; h v, afferent vessel 

 going to the gills; bo, efferent branchial vessels, returning the blood to the ven- 

 tricle, their swollen basal portions acting as auricles ; v c, anterior vena-cava ; r, r, 

 ventral renal organs, two ventral sacculated branches of the vena-cava (on the 

 leftside, the vein from the ink-sac and rectum is shown); r', r'- two pyriform 

 renal organs, or sacculated and glandular portions of the posterior vense-cavae, 

 directly connected with r, r; r, v c\ lateral pallial veins, going to the dorsal sac- 

 culated divisions of the veuse-cavse ; v c", v c" two posterior vense-cava;, returning 

 from the caudal fin and mantle ; S, first stomach, or gizzard ; S', large, saccular 

 ccecal appendage of the stomach ; ^, glandular, plicated division of the stomach ; <, 

 spermary or testicle ; ip r, prostate gland, with the vesiculas-seminales and sperma- 

 tophore-sac; p, efferent sperm-duct or 'penis'; P, posterior portion of the pen. 



Figure 2. — The same. Dorsal view of the reproductive organs, part of the renal 

 organs, heart, etc., dissected out. The lettering is as in figure 1, with the follow- 

 ing additions: vd, vas-deferens, closely folded upon itself ; ss, spermatophore- 

 sac ; p 0, genital artery ; g o, spermatic artery and vein ; S", commencement of 

 intestine : p t, part of peritoneal membrane. 



Figure 3. — Loligo Pealei. Female in the breeding season. Oviduct, filled with ova, 

 dissected out. Ventral view, about i natural size; vo, commencement of convo- 

 luted, thin membranous portion of oviduct ; o d, entrance to glandular portion ; 

 d', glandular portion of oviduct, surroimded by the large, laminated gland, x', 

 the arterial vessels of which have been injected ; op, orifice of the oviduct. 



Figure 3a. — The same specimen, seen from the dorsal side. 



Figures 4a, 46. — Loligo Pealei. Male. Side and front views of horny rim of one of 

 the marginal suckers of the tentacular club, enlarged 10 diameters. 



Figure 5. — The same. Portion of the rim and marginal denticles of one of the large 

 median suckers of the tentacular club, much enlarged. 

 Figures 3, 3a are by the author ; the others by J. H. Emerton, from alcoholic speci- 

 mens. 



Plate XLI. 



Figure I.— Loligo Pealei, var. borealis. Female, in the breeding season. Ventral 

 view, about | natural size. The mantle has been ctit open nearly in the median 

 line and the peritoneal membrane partly removed. The lettering is the Same as 



