be 
bo 
TESTACELLA MAUGEI. 
Description. —ANIMAL elongate, attenuate anteriorly and very tumid towards 
the rear; 60-100 mill. in length when fully extended, but very short and cylindrical 
when contracted ; GROUND-COLOUR greyish-white to black, but usually of an earthy- 
brown, paler laterally and besprinkled with deep-brown specks, which are most 
plentiful on the back; the longitudinal dorsal furrows are well defined and enclose 
a double row of conspicuous tubereles ; LATERAL FURROWS deeply incised and much 
wider apart at their origin at the peripallial furrow than in the allied species; 
MANTLE sparingly maculate, and sometimes partially enveloping the shell; soLE 
similarly but more brightly colored than the body, whitish, yellow, pink, or even 
black, FOOT-FRINGE sometimes marked with perpendicular lineoles, as in Arion ; 
SLIME colorless and not very tenacious. 
SHELL subquadrately oblong, very convex, compressed or slightly sinuate at front 
margin, and about one-sixth of the total length of the animal when extended, whitish 
with a brown periostracum which becomes abraded from all the more exposed parts 
of the shell ; spree produced and terminal, consisting of about 14 whorls; LINES OF 
GROWTH variable but often strong and irregular; APERTURE oblong, very large, 
outer margins slightly expanded, interior slightly nacreous; COLUMELLA narrow, 
convex, and regularly arched. Length, 15 mill. ; breadth, 7 mill. ; alt., 4 mill. 
INTERNALLY, the REPRODUCTIVE SYSTEM is simple 
in its organs and their arrangement, and characterized 
by a short PENIS-SHEATH, very narrow below, but 
albq 
abruptly swollen above, without a FLAGELLUM, but 
with a strong terminal RETRACTOR, which is attached 
dorsally to the outer integument towards the rear of 
the body ; the VAGINA is much shorter than in 7. seutu- 
Zum, and considerably less dilated above; OVOTESTIS 
ereyish or yellowish-white, composed of loose oblong 
follicles imbedded within the digestive gland and dith- 
eult to isolate; HERMAPHRODITE DUCT very tortuous 
and entering the albumen gland very high up; ALBU- 
MEN GLAND enormous, linguiform, of a yellowish or 
ochreous tint; OvIDUCT clear bluish-white, with broad 
ample folds; SPERM-DUCT opaque, buff or cream- 
coloured; VAS DEFERENS stiflly convoluted at its origin 
from sperm-duct, and entering the penis-sheath at the Wig 33) Seruaivereane ae 
free end, close to the retractor muscle ; SPERMATHECA Testacella maugei X1}. 
globular or roundly-oval, clear grey, marked superfici- (Bristol, Mr. J.W. Cundall). 
ally with white vein-like markings, and imbedded in alb.g. albumen gland ; of. ovo- 
. : Site = z testis; ov. oviduct; /.s. penis 
the base of the albumen gland, to which it has muscular — sheath: ».. retractor muscle ; 
attachment ; SPERMATHECA DUCT long, about three — sf. spermatheca; sf.d. sperm 
times the diameter of vesicle, thickened at base and duct ; v.d. vas deferens. 
longitudinally striped, the upper half adherent to oviduct, the lower half sometimes 
attached to vagina by a stout muscle ; ATRIUM short. 
GSE 
ov 
The ALIMENTARY CANAL with short G:SOPHAGUS, opening out mto a broadly 
oval or pyriform crop, which is whitish when empty, and has thick walls especially 
towards the pyloric end, with the whole surface corrugated with longitudinal and 
transverse wrinkles, and attached to left side of body by a sheet of muscles; the 
vestigial STOMACH, a small, white, rounded protuberance, is at first bend of gut, 
at the point where the intestine enters the digestive gland and receives the thick 
white bile ducts; the DIGESTIVE GLAND is brownish buff, speckled or reticulated 
with white ; INTESTINE very stout in its early course. 
The TENTACULAR RETRACTORS of 7. inaugei ave especially remarkable for their 
curious asymmetry and inequality ; the left retractor is affixed to the body-wall of 
the left side, close to the margin of the 
foot-sole, while the noticeably longer right 
tentacular muscle is attached to the sole also 
quite to the left of the median line of the body. 
The LINGUAL SHEATH presents the same 
pearly-white glistening appearance which 
characterizes that of the preceding species, but Fic. 33.—Lingual sheath of Testacella 
it is comparatively smaller and its retractors — #awgeé, illustrating the retractor muscles of 
more simple, consisting of two to five pairs of | '* ee 
partially-independent and powerful terminal muscles, any one of which exceeds in 
mass the cephalic retractor of Arion ater or Limax maximus, all with common point 
of fixation to the integument on the left side of the body beneath the shell. The 
lateral muscles so conspicuous in 7. haliotidea and T. scutulum are quite absent. 
