86 NILS HJ. ODHNER, MOLLUSCA. 
the umbilicus. Behind the peristome a furrow-like contraction of the body whorl, 
and behind the furrow a crest-like swelling of a dark brown colour, crossing the 
whole whorl. Umbilicus narrow, deep. Apical whorl smooth. Dimensions: diameter 
10.5, height 7, aperture height 4.5 mm; whorls 4'!/2. Locality: Malanda (Febr. 1913), 
3 sps, thereof 2 small young ones. 
This shell is closely related to Chloritis inflecta HEDLEY (1912) from south-west 
of Cairns. It differs from the latter in having the apical whorls smooth, the shell 
perforate and of smaller size — Ch. iwnflecta is 15 mm when there are 4'/2 whorls — 
as well as in the dark-brown lip, while that of Ch. inflecta is buff. 
As external characteristics of the animal may be mentioned that the foot carries 
a dorsal longitudinal furrow and some oblique ones on its sides; there are no borders 
at the foot edges, and the sole is undivided. The foot has a uniform grayish brown 
colour, the mantle edge and the tentacles are blackish and the mantle part which 
covers the pulmonary sac is grayish, with small, regularly scattered, black dots. 
(0) 5 10 IS 25 32 
Fig. 42. Jaw of Chloritis Fig. 43. Teeth from the radula of Chloritis bilabiata n. sp. X 750. 
bilabiata n. sp. 
The jaw (fig. 42) carries 16 strong ribs. — Radula (fig. 43) with about 32 
teeth on each side of the median tooth. The latter is comparatively narrow, with a 
strong, simple cusp, equal in length to the basal plate. The 10 inner laterals with 
a similar cusp and without denticles; teeth 11—13 with a small denticle outside the 
cusp, and the sequent marginals with a bicuspid mesocone and a small ectocone; 
the two outermost ones with a single obtuse mesocone and two ectocones. 
Of the inner anatomy only so much could be observed on the badly preserved 
specimen that the penis is rather long, just as in Chloritis. Also in the structure 
of the jaw and the radula, the present species shows agreement with this genus, espec- 
ially with the group Austrochloritis PILsBRY, but it differs in the peculiar shell form 
with its constriction and sequent swelling behind the lip, as well as in the smooth 
apical whorls, which bear no hair-points. These features give the species a close 
resemblance to the group Cristigibba of Planispira, which is confined to New Guinea. 
Whether the present form presents a real link between the latter section and the 
Australian group of Chloritis is a question for which only an anatomical examination 
can give the necessary basis of judgement. 
