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GASTEROPODA. 61 
Approaches H. Cressida, but is much thinner, nearly transparent, of 
a much smoother texture at surface, more accurately pyramidal, more 
flat at base, and the colouring seems to be very uniform. The colour 
of the animal is also different. In shape it is almost precisely like H. 
elegans, though much larger. It is also like H. planorbordes, Lesson 
(H. solarium, Quoy), which is very much smaller, and destitute of 
fillets. The shell figured by Philippi (Abbild. tab. 4, f. 9), as H. 
marginata, Miill., but which, from the umbilicus, and from a specimen 
in my collection, seems to be a variety of H. trochiformis, Fer., bears 
a very great resemblance to this species, except in its umbilicus. 
Figure 57, the upper, 57 a, the lower, and 57 4, the lateral view of 
the shell. 
Hetix TrocuirorMis (Ferus.) Pfeiffer. 
“ Testa umbilicata, solida, trochiformis, apice obtusa, basi plana, acute 
carinata, oblique rugosa, saturate rufa vel fusco-lutea ; anfractibus 
sex, supra carinam prominentem stramineam convexis ; umbilico an- 
gusto, pervio: apertura irregulariter rhombea ; peristomate subreflexo, 
margine columellari recté descendente, versus umbilicum expanso.” 
(Pfeiffer, 
Helicella trochiformis, Fexussac ; Prodromus, 301. 
Helix trochiformis, PFEIFFER; Symbole, ii. 40; Monog. Helic. Viv., 
i. 206; Puitipp1; Abbild. p. 79, tab. 4, f. 9. 
ANIMAL covered with lines of elongated, subrectangular papille, 
the margin of the foot radiated. Colour pale leaf-green, violaceous on 
the back of the neck and halfway up the tentacles, the tips of which 
are chlorine green, as is also the mantle; marginal limbus rather bright 
green. Another specimen has a dark lateral line, with a bright oliva- 
ceous body and chlorine margin; and with a dark stripe down the 
tentacle and along the back of the neck. Sometimes the general 
colour of the body is purplish. 
The shell is very much like H. Eurydice, but is uniformly distin- 
guished from it by its smaller umbilicus, its larger, more elevated 
16 
