298 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 
In this species the following characters may be also noted: (1) the 
absence of the amatorial organ; (2) the simple form of the penis, with 
no kalk-sac or ceecum at the retractor muscle; (3) the very small 
number of teeth in each row of the radula, that is to say, the 
radula is very narrow as compared with those of some species of 
Helicarion. Thus far it agrees with Helicarion permolle, Stoliczka, 
from Penang, and as regards characters 1 and 2 with H. Aukenthale 
and H. Halmaherica, Kobelt, from the Celebes, but in these two last 
the type of radula is quite different; they have 320 and 602 teeth 
respectively in each row, as against only 95 in H. Willeyana, It does 
not agree with Lamprocystis, as typified by LZ. succinea, for in this 
genus Pfeffer places several ovoviviparous species, and we find this 
last character common to Microcystis and Fretum, Sykes (= urypus, 
Semper). It finds no place in Semper’s group with chitinous papillate 
structure in the penis, his ‘ Reizepapillen’ (= Pseudhelicarion of Yon 
Mollendorff; type Helix ceratodes, Pfr.). 
It is interesting to note that in the simple form of the penis, 
combined with the absence of the amatorial organ, this species agrees 
exactly with Videna, Discus, ete. (vide Wiegmann), Dendrotrochus 
conicordes, Trochomorpha timorensis, 7’. planorbis, and 7. lardea (see also _ 
Proc. Malac. Soc., vol. i, pl. xix, fig. 3, Discus bicolor). Although 
these species have no shell-lobes, while their shells are discoidal, 
sharply keeled and altogether so very different to the globose shells 
of Dr. Willey’s collecting, may not their relationship le in the above- 
named direction rather than with chlamydate molluscs inhabiting the 
same region, but having a distinct origination. 
2. Hexicarion (?) Woopwarpl, n.sp. 
Hab.—Lifu and Island of Pines, Loyalty Islands (Dr. A. Willey). 
Shell (Fig. 2g) imperforate, very globose, shiny ; sculpture consisting 
of beautiful, tine, regular, somewhat wavy, longitudinal striation, 
broken up by very fine transverse grooves into minute dots; the colour 
in one example is of a pinkish tint, in two others it is paler and 
greyer; spire depressed, suture very shallow, apex flatly convex; 
whorls 4, regularly increasing; aperture broadly lunate, oblique ; 
peristome thin, slightly reflected near the umbilicus. Major diameter 
7°25 mm., and of a specimen from the Island of Pines, 7°75 mm. 
Animal (Figs. 2, 2a, 2b) pale-coloured, with a broadish dark band on 
either side of the neck, separated by a pale dorsal space, and having two 
very distinct parallel grooves on the central line broken up by cross 
grooves into oblong spaces. The foot has a short horn above the 
mucous gland, and the peripodial margin is distinctly fringed; the 
foot beneath is divided. ‘lhe right shell-lobe is broad, and narrows 
rapidly. The left shell-lobe (Figs. 2, 2a, 26) is broad and well developed, 
larger decidedly than the right. The dorsal wall of the branchial 
sac is black, mottled, and streaked with white. 
Genitalia (Figs. 2c, 2d).—The retractor muscle of the penis is 
attached to a short straight caecum, at the base of which the vas 
deferens enters; this last, slightly convoluted, lies close against the 
lower thick body of the male organ up to its basal end. Under 
