A. M Verrill — North American Cephalopods. 441 



Plate XL. 



Figure I. — Loligo Pealei, var. pallida. Male. Ventral view, about |- 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; h, olfactory crests; c, eye; d, siphon, cut opeu ; 

 d'% cavity of siphon; e, valve of siphon; /, one of the coonective cartilap:es of 

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

 ridge, fitting into the siphonal cartilage ; g. gill ; /i, termination of the intestine, 

 or rectum; i, ink-Sric; V, duct of ink-sac; I, portion of liver, in position; ?«.', ?n'i 

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

 body; FT, systemic heart, or ventricle, crossed b^y the artery of the ink-sac; 

 a 0, 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, a m, branchial auricles ; 6 ?', afferent vessel 

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

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

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

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

 renal organs, or sacculated and glandular portions of the posterior venae-cavse, 

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

 culated divisions of the vente-cav^ ; v c", v c" two posterior venae-cavaj, returning 

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

 coecal appendao;e of tlie stomach ; fc, glandular, plicated division of the stomach ; t, 

 spermary or testicle ; p r, prostate gland, with the vesiculre-serainales and sperraa- 

 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 : v d, vas-deferens, closely folded upon itself ; s s, spermatophore- 

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

 intestine : j) f, part of peritoneal membrane. 



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

 dissected out. Ventral view, about ^ natural size ; v o, commencement of convo- 

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

 d\ glandular portion of oviduct, surrounded 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 tlie rim and marginal denticles of one of tlie large 

 median suckers of the tentacular club, much enlarged. 

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

 mens. 



Plate XLI. 



Figure 1. — Loligo Pealei, var. horealis. Female, in the breeding season. Ventral 

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

 fine and the peritoneal membrane partly removed. The lettering is the same as 



