122 AGRIOLIMAX LAEVIS. 
Description.—ANIMAL rather slender, glossy, and smooth, and of a peculiar 
semi-gelatinous consistency, usually of a reddish-brown or chocolate colour, and 
when contracted bearing a great resemblance to a short plump worm ; BODY rounded, 
with some distinct and rather prominent tubercles ; TAIL keeled ; SHIELD large, 
rounded in front and behind, and somewhat paler in colour than the body, strongly 
concentrically ridged around a sub-central and laterally-placed nucleus ; NECK very 
long, making the shield seem to be nearly centrally placed ; TENTACLES black and 
very thick, with large black bulbs ; Foor longitudinally tripartite, light brown, with 
median area more transparent and apparently darker. The body MUCUs is abundant, 
clear and watery, but after continued irritation tends to become milky and turbid 
with minute particles of lime; the locomotory mucus is more viscid and tenacious. 
SHELL oblong-oval in shape, and showing an indistinct oblique ridge from the 
apex to the anterior right side of the shell, corres- 
ponding somewhat to the gonial ridge! of the 
Peleeypoda ; white and glistening, convex above, 
and correspondingly concave beneath ; NUCLEUS 
distinct, and placed towards the left posterior angle 
of the shell; concentric lines of growth arcuate, 
numerous, and distinct; margins not broadly membranaceous. Length, 3 mill. ; 
breadth, 13 mill. 
INTERNALLY, the body is darkly pigmented ; the KIDNEY, HEART, and LUNG- 
CAVITY resemble those of A. agrestis; the AORTA runs a considerable distance before 
Fic. 129, — Internal 
shell of A. leurs, x 4. 
(Steeton, Yorks., Mr. 
F. Rhodes). 
dividing into the cephalic and visceral branches ; the 
lateral sinuses, especially that of the left side, are 7 ae 
favourable for observation ; they can be seen through gtr 
the transparent skin to remain almost uniformly 
open without in the least answering to the pulsa- 
tions of the heart, and are thus strictly venous ; the 
supra-pedal gland extends quite the length of the Fic si dee I 
body. The organ of Semper is composed of several — GSoPnageal ganglia of al. davis, 
5 . showing the otocysts, x 20. 
oblong lobules, easily detachable on account of the (Chistenorch sant Soy. 
tenderness of the skin; the OSPHRADIUM is indis- 
tinctly developed, but it can be traced to the middle of the lung chamber. 
Fic. 130.—Underside of the sub- 
Fic. 131. 
y 
Fic. 132.—Penis laid 
open to show the excita- 
tory organ, X 9 (after 
Simroth). 
Fic. 133. Fic. 134. 
Fic. 131.—Sexual organs of A. dev/s, greatly enlarged (after Simroth). aéé.g. albumen gland; 
ot. ovotestis ; ev. oviduct; sf.d. sperm duct ; sf. spermatheca ; 7. retractor; #.s. penis sheath. 
Fic. 183.—Alimentary canal of A. devis, showing the adherent salivary glands, Xx 3 (after Simroth). 
Fic. 134.—Cephalic retractors of A. devis, x 12. (Armley, Leeds). 
The REPRODUCTIVE ORGANS are very gelatinous and deeply pigmented; the 
OVOTESTIS is dark chestnut-brown, and acinose; its duct scarcely sinuous, mostly 
dark, with a pale VESICULA SEMINALIS; ALBUMEN GLAND deep yellow ; OVISPER- 
MATODUCT firmly united, whitish above, chestnut-brown beneath; FREE OVIDUCT 
short and glandular; VAS DEFERENS short, entering the penis-sheath nearly termin- 
ally ; SPERMATHECA elongately oval, flesh-coloured, and attached to ovispermatoduct 
by a distinct apical muscle; PENIS-SHEATH of a peculiar hammer-like form and 
darkly pigmented, but occasionally in Europe, and invariably in America, is simply 
elongate; the sub-basal lateral protuberance contains the SARCOBELUM, or excita- 
1 Monog. i., p. 45, f. 109. 
