™. 
456 APPENDIX—HYALINIA LUCIDA. 
Prof. A. E. Boycott has, however, demonstrated that certain variations 
observed in the number and character of the radular teeth in Myalinia 
ielvetica ave attributable to the size and age of the animal, and this ex- 
planation of the differences noted doubtless apphes to the genus generally. 
The Hyalinie are described by Prof. Westwood as the chief prey of the 
Glow-worm (Lampyris noctiluca 1a.), which im its larval and perfect 
stages is a very voracious enemy. 
A certain amount of variation in the character of the shell im this as in 
other genera is attributable to the special environment under which the 
animals live. In very dry or exposed situations the shell, as observed by 
Macgillivray, is thicker, firmer, and more opaque; while im damper and 
more shady situations the shells are thinner and more fragile. 
Hyalinia lucida (Drap.). 
Nomenclature. stated on p. 18, the name lucida was bestowed by 
Prof. Draparnaud on shi species in 1801, in his “Tableau Moll.,” but by 
error or design this name was in his posthumous “Histoire” app lied to 
the species now known as Zonitoides nitidus, and the name nitida is still 
affixed to the Draparnaudian type specimens of /7. /ucidw in the Imperial 
Museum of Vienna. 
Prof. Draparnaud’s figures and the original description of this species 
are here reproduced for convenience of reference. 
Fic. 523.—//yalinia lucida (Drap.), natural size (after Draparnaud). 
Helix nitida= Helix lucida Tableau des Moll., n. 46, p. 96. SHELL thin, flat, 
and transparent ; a little convex, and clear horn colour above ; milk-white, tinged 
with greenish, and more glossy beneath. The surface is smooth, very delicately 
striate, and often bearing very small seales or Jamellie, due to the nature of its 
cadueous epidermis. SPIRE composed of 5 whorls, of which the last is much larger 
proportionately, SUTURE well marked, often accompanied by a very slender and 
often brownish line. APERTURE large, semi-oval, and oblique, strongly encroached 
upon by the penultimate whorl, the upper margin extending beyond that of the 
columella, peristome simple and direct. UMBILICUS expanded.—DRAPARNAUD, 
Histoire des Moll., 1805, p. 117, pl. viii., ff. 2 
Geographical Distribution.—he records of the distribution have 
heen increased by its discovery in the Isle of Alderney and in the counties 
of Cardigan, Carnarvon, and Northampton. 
In Ireland it has been recorded from Hast Galway and Kerry. ‘The late 
Mr. W. Moss had specimens from Belfast, co. Down, their identification 
being verified anatomically; while Mr. A. W. Stelfox remarks that in 
many places in Munster and Leinster it is the most plentiful /Zyalinia, 
especially in the vicinity of dwelling-houses, and adds to its known range 
the counties of Meath, Kildare, Tipperary, Clare, Wexford, and W aterford. 
It has also been introduced into various hot-houses in Cork, Dublin, 
Antrim, Down, Fermanagh, etc., and appears to thrive under such con- 
ditions ; but the Antrim records are considered by some of the Irish 
couchologists to be really referable to the //. A‘bernica of Kennard, which 
is a sub-variety of Hyalinia cellaria. 
