HYALINIA ALLIARIA. oo 
widely separated, and from them fall to the lateral grooves a series of zebra-like 
markings, faintly perceptible by transmitted light, and between which are flat and 
irregularly shaped RUGOSITIES ; below the lateral grooves the TUBERCLES are 
rounded and few in number, and the colouring is a translucent grey, paling as it 
approaches the foot margin and the junction with the MANTLE ; OMMATOPHORES 
almost black, rather short and thick, slightly more slender before bulbous apical 
enlargement ; RETRACTORS show as a dark line down the ommatophores and along 
the back; the SOLE is trifasciate, the side areas are separated from the median 
area by distinct longitudinal grooves, and partake of the general dark pigmentation 
of the body. 
SHELL depressly convex above, but more compressed below than in //yalinia 
helvetica; WHORLS 4-44, semi-transparent, glossy and smooth, with faint but regular 
striation in the line of growth, most pronounced at the 
sutures; of an amber or horn colour above, passing 
imperceptibly into a whitish basal opacity ; umbilicus 
about a mill. in diameter, distinetly showing the pen- 
ultimate whorl, and comparatively much wider than 
in H. helvetica; whorls regularly increasing in size ; 
spire somewhat elevated ; suture distinet but not deep ; Frc. 89,—Section through the 
aperture erescentic and somewhat oblique, with a thin © shell of //, aédiaria to show 
and sharp peristome. the shape and character of the 
5 3 4 s E r whorls and umbilical cavity x 4 
Diam., maj. 6 mill., min. 5 mill. Alt., 25 mill. (from a preparation by Mr. F. 
Average weight of adult shells about ‘rd of a grain. Rhodes). 
When retracted within the shell, the upper side appears of a dark dusky-brown, 
with a slender slightly blackish line at the margin of the collar ; the under-side is 
yellowish-brown up to the yellowish renal organ, beyond which to the aperture the 
colouring is blackish. 
pp 
Ges y _ a 
2 (fant 
& ey * 
Fic. 90. Fic. 91. Fia. 92. Fic. 93. 
Anatomical details of Hyalinia alliaria (Miller), from specimens collected at Redcar by Mr. B. Hudson. 
Fic. 90.—Nerve ring of Hyalinia alliaria (Miller), as viewed from the rear, showing otocysts, x 20. 
Fic. 91.—Nerve ring of H. helvetica (Miller), as viewed from the right-side, showing otocysts, x 20. 
Fic. 92.—Pedal ganglia of Hyadlinia alliavia (Miller), highly magnified, showing the otocysts. 
ot. otocyst 3 cc. cerebro-pedal connective. 
Fic. 93.—Otoconia of Hyalinia alliaria (Miller), highly magnified. 
The ALIMENTARY CANAL is of the usual triodromous type, not differing essen- 
tially from that of the congeneric species; the white and compact SALIVARY 
GLANDS are attached to and surround the Jong and slender GiSOPHAGUS ;_ the CROP 
is scarcely distinct from the stomach, with which externally it apparently gradu- 
ally blends, and the LIVER or digestive gland is more compactly lobed than in 
Hyalinia cellaria. 
The REPRODUCTIVE ORGANS show a whitish OVOTESTIS, composed of a few 
scattered clusters of follicles ; HERMAPHRODITE DUCT long, slender, and not con- 
volute; ALBUMEN GLAND broadly linguiform ; ovipucT light grey, with ample 
folds; SPERM-DUCT narrow above, much wider below ; VAS DEFERENS showing the 
usual enlargement in the latter half of its course, and entering the somewhat 
areuately fusiform EPIPHALLUS near the centre ; the PENIS-SHEATH is separated 
from the epiphallus by a distinet constriction, and gradually increases in calibre, 
culminating in a broad and protruding ANNULUS to which the vas deferens is bound 
by muscular tissue, afterwards contracting to open into the short ATRIUM; the 
retractor muscle of the epiphallus is terminal, rather long, and attached to the 
oviduct ; the free-oviduct increases in size as it approaches the sexual orifice ; 
the SPERMATHECA is very broadly oval or almost spherical, with reddish-brown 
core, its duct is very slender above, but thickens below, its junction with the 
oviduct being hidden beneath the largely developed VAGINAL GLAND, by which 
the oviduct is enveloped. 
