™ 
68 HYALINIA NITIDULA. 
Original Description. — “‘H. nitidula, H. testd depressA, pellucida, nitida, 
cornea, supra lutescente, subttis albida ;anf. quatuor.”—J. P. R. DRAPARNAUD, 
Hist. Nat. Moll. France, 1805, p. 117. 
Description.—The ANIMAL has an elongate body, blunt in front and attenuate 
behind, of a pale blackish-grey colour varying to a glossy black, and covered with 
irregularly-shaped tubercles which are minutely speckled on the summits with a 
darker shade and arranged in four somewhat indefinite longitudinal lines, but 
sharply separated at the level of the ommatophores from the paler slaty-grey 
area of the sides, where the rows of tubercles have an obliquely descending direc- 
tion ; DORSAL and LATERAL GROOVES indistinet and not observed ; MAN'TLE grey ; 
FOOT-SOLE tripartite, yellowish, narrowly margined with grey ; OMMATOPHORES 
finely granulated, moderately long and thickish, especially at the base, slightly 
bulbous at the end, with scarcely perceptible EYE-SPOTS ; the RETRACTORS show 
black through the skin and also appear as two broad distinct black stripes on each 
side of the back ; LOWER TENTACLES about one-fourth the length of the upper pair 
and translucent at the tip ; MUCUS watery and abundant. 
The SHELL is depressly convex above, slightly more convex beneath ; of a dull 
brownish-horn colour above, with an opaque whitish area around the umbilicus, the 
transverse striation somewhat distinct and regular, 
and the spiral strive also more regular and distinct 
than in H. cellaria; but the embryonal whorls are 
simply shagreened ; epidermis thickish and giving the 
colour to the shell ; whorls 44-5, convex and rounded, 
the last expanded laterally as it approaches the = 
mouth ; spire slightly raised; suture well marked ; Fic. 103.—Section through the 
mouth rounded-oval except where interrupted by the shell of Ayadinia nitidula to 
preceding whorl ; umbilicus wide, even in the young, Show the shape and character of 
but becoming very openly umbilicated as the shell the whorls and umbilical cavity, 
5 D ? x 3 (from a preparation by Mr. 
approaches maturity. F. Rhodes). 
Diam., 8 mill. ; alt., 4 mill. 
INTERNALLY, the HEART is white in colour, and the VENTRICLE much larger and 
more voluminous than the AURICLE, while the KIDNEY or renal organ is of a clear 
buff, overspread with vein-like markings springing from the cardiac side. 
The REPRODUCTIVE ORGANS show the OVOTESTIS elongate with compact acini ; 
the HERMAPHRODITE DUCT is not convolute, and is thickest as it approaches the 
long and slightly twisted VESICULA SEMINALIS ; ALBUMEN GLAND yellow, large, 
Fic. 104. Fic. 105. Fic. 106. 
Fic. 104.—Alimentary canal of Hyalinia nitidula sub-var. helmii x 4, showing the salivary 
glands and the terminal flexure. 
Fic. 105.—Pharyngeal and tentacular retractors of Wyalinia nitidula var. nitens, enlarged (after 
Simroth). 
Fic. 106.—Sexual organs of Tyalinia nitidula (Drap.) X 4. 
a.g. albumen gland ; ef. ovotestis ; ov. oviduct; Z.s. penis sheath; sf. spermatheca ; sf.@. sperm 
duct; v.d. vas deferens. 
and linguiform; the OvipUCT is greyish-white and distinctly sacculated ; the 
SPERM DUCT distinet and broad; the VAS DEFERENS is short and without a trace 
of the medial enlargement so characteristic of the Huhyaliniw ; PENIS-“SHEATH very 
