106 AGRIOLIMAX AGRESTIS. 
The REPRODUCTIVE ORGANS have their orifice about two mill. behind the right 
onynatophore ; the OVOTESTIS is comparatively enormous, and laid upon the upper 
surface of the digestive gland, 
the acini being light-brown, with 
darker connective tissue ; DUCT 
short and inflated, buff to creamy 
white, with a slender VESICULA Den 
SEMINALIS ; ALBUMEN GLAND 4 
with few lobes, and of a light- 
brown or slate colour ; OVISPER- 
MATODUCT broad above, narrow 
below; OvipUCT with ample 
folds, free oviduct short, with 
a yellowish glandular invest- 
ment; SPERM DUCT slender 
above, more compact and broad 
below; VAS DEFERENS short, and 
entering penis-sheath laterally 
near the free-end ; PENIS-SHEATH 
a broad, irregular, and medially 
constricted sac, with narrow out- Fic. 123. Fic. 124. Fic. 125, 
let, distal-end with a claw-like 
General and detailed illustrations of the reproductive 
digitate gland, which varies organs of Agriolimax agrestis. 
greatly In size and complexity, Fic. 123.—Flagellate penial gland, showing two of the many 
each segment or digit having on variations to which it is liable, x 6. 
its concave side a row of pa- Fic. 124.—Reproductive organs, x 2. a/é.¢. albumen gland ; 
pillie. The lower half of the at. atrium, with protractor muscles ; 7. flagellate gland; 
sheath contains a conical and s le ae ap lena ses ae 7. penis retractor ; 
. AS a Ca; sf.d. sper >t. 
fleshy SARCOBELUM or excita- 4 i x shee : . 
tory orean, which is often pig- Fic. RRR sede [pres laid ened, sHOWine a of entry ns 
d Saw aaa 2 : 5 the vas deferens and the internal structure of the organ, X 4, 
mented at the tip ; the RETRAC- sé. the sarcobelum or excitatory organ (after Simroth). 
TOR is a short, broad band, 
arising from the lung floor, to the right of the mid-dorsal line, anterior to both 
kidney and pericardium, and is attached, not to the apex, but to the middle of the 
penis-sheath at the same side as the point of entry of the vas deferens ; SPERMA- 
THECA fusiform or claviform, attached closely to the base of the oviduet, stem 
slender, and opening into the narrow and thick-walled ATRIUM, at the junction of 
the oviduct and penis-sheath. 
The MANDIBLE or jaw is ecrescentic in shape, with 
well and bluntly-rounded ends; it is a millimetre or 
more in width, moderately arcuate, of a yellowish- 
brown colour, and smooth in texture, but showing 
several distinct darker lines parallel with the upper 
and lower margins; median beak or rostrum not Ly ee, : i 
prominent, but somewhat acute, its vertical carina —, ae ee 
not well marked. S., Mr. A. Somerville). : 
S 
The LINGUAL MEMBRANE of a Perthshire specimen is 4 mill. long. and 14 mill. 
wide ; the denticles diminishing in size rn the outer margins; median teeth 
with a narrow, posteriorly-expanded base of attachment, the reflection narrow and 
distinetly tricuspid, the mesocone slender and projecting beyond the basal plate, 
the ectocones well developed with distinct entting points ; the asymmetrical laterals 
each have a moderately slender mesocone, the ectocone is also strongly and acutely 
developed, but the endocone is more or less obsolete, though becoming stronger 
towards the margin, the seventeenth tooth being distinctly tricuspidate ; the mar- 
ginals are distinctly aculeate, with an incipient ectocone on some of the teeth. 
The formula is 16 + mea hy doy +5 x 118=8,378. 
A 
Fic. 126.—Representative denticles from a transverse row of the lingual teeth of A. agrestis, X 160. 
The animal collected by Mr. A. Somerville, at Callander, Perth S., and the lingual membrane prepared 
by Mr. J. W. Neville. 
