262 ox SOME LAND SHELLS roLLKCTED IN QUKENSLAND, 



Microcystis responsivus, sp.nov. 

 (Plate vii., figs.36, 37, 38.) 



Shell small, thin, smooth, glossy, siibdiscoidal, spire slightly 

 elevated, periphery rounded, base flattened, narrowly umbilicate. 

 Whorls four, gradually increasing, flattened and margined at the 

 suture. Colour amber, paler on the base, a dark line along the 

 suture. Sculpture : on the smooth surface, growth-lines appear 

 at in-egular intervals: and faint, close, spiral lines are detected 

 with difficulty. Aperture oblique, ovate-lunate: a thin callus 

 unites the margins. Columella angled and thickened. From the 

 angle, a keel winds into the umbilicus, which is narrow, largely 

 obstructed by the penultimate wliorl, and spirally grooved. 

 Height 3: maj. diam., 6; min. diara., 5 mm. 



Compared with M. rustica Pfeiffer, the new shell is smaller and 

 proportionately flatter. In a good light and under high magnifi- 

 cation, fine, spiral, engraved lines appear on M. re.sp07i,sivtis, but 

 not on M. rustica. 



Try on has reported Nanina marmorata Cox, from Port Curtis, * 

 but, as that species does not range so far north, 1 suppose that 

 he mistook M. responsivus for it. Microcystis marmorata Cox, 

 has, indeed, a general resemblance to M. responsivus, but differs 

 by being larger, paler in colour, having a more elevated spire, and 

 especially by having the periphery keeled. 



flab. — Mr. Jackson found a few specimens, under fallen leaves, 

 un the ground, in the Bottle Tree Scrub, west of Gladstone, Port 

 Curtis, in August, 1 908 (type-locality). He found another speci- 

 men under leaves, on the ground, at the Coolabunia Pine Scrub? 

 in June. Dr. T. L. Bancroft has sent me a specimen from 

 Eidsvold. It was collected, many years ago, at Gayndah, by Mr. 

 C. Masters. 



Microcystis inscj;nsa, sp.nov. 

 (Plate vii., figs.39, 40; Plate viii., fig.41.) 

 Animal yellowish cream-colour(S.W.J.). 



Shell globose-turbinate, perforate, thin, glossy, translucent, 

 spire elevate, periphery rounded, base ventricose. Colour olive- 



* Tryoii, Man. Couch., ii., 1886, p. 105. 



