TESTACELLA SCUTULUM. 1195) 
Description. ANIMAL tawny-yellow, more or less freely speckled with brown, 
especially on the back ; Sole and FOOT-FRINGE orange-yellow, most vivid near the 
tail; LATERAL GROOVES distinet and originating in a common depression in advance 
of, but connected with, the peripallial furrow ; the mid-dorsal sculpture so distinet 
in 7. manugei is only very faintly indicated. When contracted it usually assumes : 
semi-globose form somewhat dissimilar to the lenticular shape of hadiotidea or the 
short, cylindrical aspect of mauget. 
SHELL narrowly auriform, UPPER SIDE flat or even actually coneave, LINES OF 
GROWTH comparatively fine, PERIOSTRACUM rusty-brown, and more persistent than 
in maugei or haliotidea, the colour showing internally through the thin outer margin 
of shell ; NUCLEUS nearly central, placed at an angle of 60 to 70 deg. to the vertical 
line of the shell ; COLUMELLA glossy-white, broad and angularly concave, terminat- 
ing abruptly at the anterior margin of the shell. Length, 7 mill.; the greatest 
width, about 4 mill., being about the middle of the shell ; alt., 15 mill. 
INTERNALLY, the ALIMENTARY SYSTEM displays a short GiSOPHAGUS, which 
opens into a somewhat brownish Crop, 12 or 14 mill. long, which shows longitudinal 
whitish stripes, due to longitudinal plaits within ; the paired white SALIVARY GLANDS 
are 5 or 6 mill. long, attached to its sides, and do not blend together ; the VESTIGIAL 
STOMACH is of a purplish colour, about 3 mill. in diam., and is placed at first bend 
of eut, just before receiving the stout and white bile ducts ; the GUT, which is very 
thick and firm, traverses the digestive gland, afterwards narrowing into a slender 
rectum, which opens as usual on the right side beneath the shell. 
The REPRODUCTIVE ORGANS simple; OVOTESTIS flesh-coloured with long acini 
and imbedded within digestive gland ; pucT whitish, convoluted throughout, and 
entering the albumen gland about the middle, 
from whence to outlet it is fused to gland ; 
ALBUMEN GLAND large and broad, ochreous 
or reddish amber; OVISPERMATODUCT wide 
and compressed, the two channels well united ; 
OVIDUCT in many broad, close-set plaits ; 
SPERM-DUCT broad throughout and of a buff 
colour; VAGINA very long, slender below, 
much dilated above and abruptly doubly- 
flexed ; SPERMATHECA clobular, reddish- 
brown, with dull white mottlings when 
mature, closely attached to the middle of 
ovispermatoduct ; stem of spermatheca com- 
paratively short and bent, slender above and 
gradually enlarging to base ; Wess) D2 Fic. 21.—Sexual organs of 7. seutulum Xx 1%. 
long and simple, entering the penis sheath at (Chiswick. /MrS: G. Cockers © 
its apex close to the retractor ; PENIS SHEATH Ale. Gilson Aleudis Gh Gueiesies er 
long and opaque-white, narrow at base, but — oviduct ; f.s. penis sheath ; 7.72. retractor 
increasing in diameter as it passes upwards, — Muscle ; sf. spermatheca ; sf.@. sperm duct ; 
the upper half broad and rigidly doubly — 7“ ¥#s deferens. 
flexed; RETRACTOR very long and ribbon-like. passing freely over the dorsal surface 
of visceral mass and affixed near shell at caudal end of body ; ATRIUM very short. 
The RETRACTORS of the tentacles are shorter than those of 7. haliotidea or T. 
mougei, and more exactly symmetrically in their points of attachment to the inteen- 
ment close to the junction of the sole 
with the sides of the body; they run 
free, as usual, alone each side of the 
lingual sheath, dividing into the usual 
two branches for upper and lower ten- 
tacles before reaching brain ring ; the 
bands are ribbon-like and of nearly 
uniform width throughout, but spread- 
ing at the roots for firmer hold. 
The LINGUAL SHEATH is enor S ; 
iene aire t | a siete Fic. 22.—Lingual sheath of 7. scutu/um x 14, 
orming a jirm, tough, pearly body, Hornsey, collected by Mr. H. Wallis Kew, illustrat- 
anteriorly nearly eylindrieal, but taper- ing the retractor muscles of the tentacles and 
ing off behind into a very powerful — lingual sheath. 
muscle, composed of two, three, or four partially independent muscles, as in 7. 
mneuger, and having in addition its hinder half attached laterally to the skin of the left 
side by a series of five to ten pairs of conspicuous muscular bands running parallel 
to each other and fixed at independent points, 
