82 NILS HJ. ODHNER, MOLLUSCA. 
then strongly and uniformly curving into the columella; the latter perpendicular, its 
margin in a short upper portion reflected and partly covering the umbilicus. Maximal 
dimensions: diameter 15, height 11.5, height of aperture 7.3 mm. Localities: Malanda 
(March 1913); 5 sps, max. d. 15 mm; Cedar: Creek (April. 1913); 2. sps,; max. d. 14 
mm; Bellenden' Ker (May ”T9IS))5 Iöspördsös mm; Herpertons(AvoronsSr2tsps 
max. d. 13 mm. — A more depressed variety with light reddish colour and some- 
Fig. 35. Foot end of Microcystis fulva n. sp. (a) and Macro- 
chlamys suturalis n. sp. (b). 
what more pronounced striae (var. depressa) was found at Cairns (June 1913), 1 sp., 
diam. 13.g, h. 8, h. of aperture 5.6 mm., and another, empty, shell at Atherton (Jan. 
NENBYR Ch Na 0 NOR AA OR Hö da MIND 
I have included this new species in the genus Macrochlamys BENSON on account 
of the general pellucide appearance of the shell and the outer morphology of the 
animal, which has a large caudal horn (fig. 35 b) and two shell lobes, as well as the 
Fig. 36. Genital organs of Macrochlamys Fig. 37. Jaw of Macrochlamys 
suturalis n. sp., distal parts. d. dart sac; suturalis n. sp. 
ep. epiphallus; fl. flagellum ; p. penis; 
v. vagina. 
left cervical lobe, divided into two portions. The foot sole is divided all along. 
Of the shell lobes, the right one is tapering, the left tongue-like. Colour of the animal 
uniformly gray (even the sole); shell lobes light coloured, cervical lobes grayish; 
mantle blackish. 
The anatomy of the genital organs (fig. 36) corresponds entirely to that of 
Microcystis fulva (in simplicity and the absence of accessory coecal sacs). The 
penis has a long flagellum, and the vagina a lengthened dart sac with a chitinous 
cord-like dart. 
