A MONOGRAPH OP 



the dense fern-tree scrubs, it reaches fvlly double that size, probably 

 owing to the moisture being more favourable to its life and development 

 than the dryer localit}'- where the typical specimens were got. I col- 

 lected it under logs and on the ground in the decaying moist vegetable 

 debris in company with H. lamiwci and Vitrina fumosa. For some time 

 I thought it the long lost H. bisidcata, or that that shell was a mal- 

 formed specimen ; but careful comparison with drawings taken from the 

 Oonc. Icon., kindly sent me by Mr. Legrand, has convinced me that the 

 two are very distinct. The present species is so totally different from 

 described forms that it cannot well be mistaken for any other. The 

 nearest to it in general appearance is H. lampra and H. ruga, from both 

 of which it differs in being bluntly angular at the periphery and also in 

 general colouration. The large specimens mentioned have somewhat the 

 appearance of H. bisidcata, which still seems to be intermediate in form 

 between it and H. Launcestonensis. 



Legrand gives North- West Bay as a habitat, but I feel confident that 



it is an error, for so far as my observations have gone it is a peculiarly 



North- Western species, and is in fact restricted to the localities given 



above. Measurement of largest specimen in my collection is as follows : 



Diameter, greatest 29, least 25 ; height, 17 mil. 



4. — Helix ( ) lampra — Pfr. 



Pfr., Reeve, Cone. Icon, sp. 1295. 

 Pro. Zool. Soc, 1854, p. 53. 

 Cox, Mon. 1868, p. 28, pi. x, fig. 9. 

 Legrand, Col. for Mon., species 6. 



Shell umbilicated, convexly-depressed, thin, horny, translucent, 

 very glossy, with fine arcuate rib-like strise, from dark green to deep 

 greenish chestnut ; spire small, convex, obtuse ; whorls 4, quickly in- 

 creasing, last depressed, expanded outwardly, not descending in front ; 

 base smoother, bright greenish-yellow ; umbilicus about l-5th of the 

 diameter ; aperture Innately oval, nearly diagonal ; peristome simple, 

 thin, straight ; margins converging ; columellar margin very slightly re- 

 flected above. 



Variety a. — Pale gi'eenish-yellow colour throughout. 



Variety b. — Flatter than the ordinary form, with the sj)ire scarcely 

 produced. 



Diameter, greatest 0-90, least 0*70 ; height 0*30 of an inch. 



Habita.t. — Upper St. Patrick's River, Ringarooma, Blue Tier, Duck 

 Kiver, Ben Lomond, Launceston; in short, the whole 

 extent of the Northern Coast, where there is a dense 

 vegetation and a moist soil. 



