80 LIMAX FLAVUS. 
DUCT or PROSTATE is thick and yellow, with an immense number of minute, white, 
‘aleareous rods within its walls; the OvipUCT is yellowish, gut-like, and thick- 
walled, but after separating from the prostate it narrows down and has thin walls, 
differing in structure from the upper albumen-secreting section; as it approaches the 
atrium it swells out, becomes thick-walled, and exhibits internally a succession of 
close-set glandular ridges and bright purple-red epithelium above; the fusiform 
SPERMATHECA which opens into the FREE-OVIDUCT in this region often contains a 
reddish substance, probably derived from the oviducal glands, and intended to aid in 
the preservation and vitality of the spermatozoids ; the 
PENIS-SHEATH is long and cylindrical with a pronounced 
double flexure, connected by tissue which sometimes also 
involves the VAS DEFERENS ard RETRACTOR; the latter is 
terminal, very long and ribbon-like, and fixed to the dor- 
sum between the heart and the kidney; the penis-sheath 
has no interior crest, but in the lower half there are two 
projecting, longitudinal muscular rolls, while the walls 
above are thinner with many fine transverse plications. 
The CEPHALIC RETRACTOR arises usually in two or 
more roots beneath the hind margin of shield, and sooner 
or later unite into a short and stont band; about two- 
fifths of the total length of the retractor from the base, it 
divides as usual into the PHARYNGEAL and TENTACULAR 
branches; the pharyngeal bifureates and fixes by the bifid 
end beneath the buceal bulb; the retractors to the omma- 
tophores expand and become very bulky, but the subsidiary 
muscles to the anterior tentacles are comparatively slender, while the slip to the lips 
is quite short and insignificant. 
The ALIMENTARY CANAL has the five intestinal coils and a stomach tract all 
without twist, and visible above the visceral mass when 
the body is opened, as in the typical Limaces ; the intes- 
tinal coils are also held in position anteriorly, as in L. 
maximus,' by looping the aorta and the cephalic retractor, 
but differ in the presence of the rectatheca or caecum, 
which is, however, only slightly attached to the rectum, 
and extends in the median-line of the body nearly to the 
tail-end. Simroth suggests that this appendage may act 
as an absorbent and imbibe the chyme from the intestinal 
sanal by an antiperistaltic motion. The SALIVARY 
GLANDS are white and woolly, with a rather long duct 
to each ; GSOPHAGUS short and pinkish-brown in colour, 
widening almost immediately after passing the nerve-ring 
into the Crop, which is brownish in colour with white 
veins and irregularly furrowed longitudinally and trans- 
versely ; the LIVER or DIGESTIVE GLAND is usually of a 
yellowish grey, and consists of two main lobes connected 
each by a single duct to the digestive tube ; the KIDNEY Fic. 102.— Alimentary canal 
is brownish or in part crocus-yellow, and opens near the of set ep se” P ptale See 
termination of the rectum infront of and at the upper  ?stetorly directed appendix. 
part of the pulmonary aperture. 
Fic. 101.—Cephalic retrac- 
tors of Limax flavus, X 2. 
A 
Cua 
\ / 
SILC Pal 
C / 
{Vv 
The MANDIBLE? or jaw is of a deep brown colour, strongly areuate from front to 
back, smooth, with a blunt but prominent median rostrum or beak, which projects 
boldly in front and beneath, ends convexly rounded, and the upper part imbedded 
in the flesh well marked. 
The LINGUAL MEMBRANE of a Cambridgeshire specimen, for which [ am indebted 
to the Rev. Prof. Gwatkin, shows an obscurely tridentate median tooth, the meso- 
cone large and well developed, but the ectocones not well marked and without 
noticeable cutting points ; the laterals display the same characters, the mesocone 
65 o 
so o 
Q \ so a fa 4 7 a . ; is ia 30 ye @ 
Fic. 103.—Representative denticles from a transverse row of the lingual teeth of Z. favus L, x 120. 
The animal collected in Cambridgeshire, and the palate prepared by the Rey. Prof. Gwatkin. 
1 Monog., i., p. 285, ff. 570, 571. 2 Monog.,, i., p. 259, f. 511, 
