™ 
lh GENUS HYALINTA. 
The ANIMAL is of an elongate form, with a narrow Foot, distinctly 
tripartite SOLE, and well-marked PEDAL GROOVES; the TAIL bears behind a 
small longitudinal slit, which is the opening of the CAUDAL GLAND, and the 
MANTLE does not extend beyond or only slightly overfolds the margin of 
the shell when the animal is extended. 
INTERNALLY, the asymmetry of the ganglia of the VISCERAL CHAIN 1s 
very striking in the largest species, the large size of the right PALLIAL 
GANGLION being in correlation with the dextral organization of the animal, 
and in striking contrast to the organization in P/anorbis, where an opposite 
condition prevails ; the orocysts occupy a less inferior 
position than is usual in Heliv, and contain innumer- 
able otoconia; the ALIMENTARY CANAL is of the triodrom- 
ous type, but with a very short and limited intermediate — 4. 9g One of the 
tract, held in position, as is usual, by the bending Otoconia of Hyatinia, 
; highly magnified 
forward of the anterior AORTA. Soh aEVee os Gus 
The CEPHALIC RETRACTORS arise from the strong columellar muscle ; the 
PHARYNGEAL and TENTACULAR retractors usually originating independently 
therefrom, the left tentacular muscle being often most distant in position 
from the pharyngeal. 
‘he REPRODUCTIVE ORGANS differ from those of Helix in their greater 
simplicity and absence of accessory parts and by opening exteriorly much 
more to the rear. ‘They present generally little specialization ; the VAGINAL 
GLANDS may, however, be well developed, and the PENIS-SHEATH is in some 
of the larger forms surmounted by an EPIPHALLUS, in which the spermato- 
phore is probably really secreted, although the median expansion of the 
VAS DEFERENS, which is sometimes called the epiphallus, is thought by 
some to be the more probable place of its formation. 
The RADULA is characterized by the comparatively few and_ loosely- 
ranked teeth, which are predominantly aculeate and of the carnivorous 
type, differing thus from Helix, in which aculeate marginals are not 
generally present. 
The MANDIBLE or jaw is oxygnathous,' variable in substance and strength, 
with usually a faintly-marked median beak or rostrum, differing thus from 
Helix in which the jaw is ribbed or odontognathous. 
Food and Habits.—The Hyaliniv, though according to Lindinger 
capable of spinning mucus threads, are strictly geophilous, and partial to 
shade and moisture, their prevalent colouring being procryptic and such 
as favours their concealment amongst stones or w ood : ; they are nocturnal 
in habit, hiding during the day beneath stones and rubbish, and usually 
venturing forth by day only during wet and showery weather. 
The species are all more or less inclined to a carnivorous or predacious 
life, though feeding readily upon vegetation. A means of defence other 
than that afforded by their procryptic colouring and retiring habits is 
believed to be the somewhat nauseous odour of garlic emanating from 
many of the species. 
A further surmised protection is said to be afforded by the rapid and 
forcible expulsion from the dorsal integument of numerous bodies, which 
in certain features resemble the urticating Nematocysts, and are known as 
Phylacites. 
Monog. i., p. 25a, f. S11, 
