AiVHIAUAV LAM) SHELLS. 4o 



114. Helix carcharias. Pfr. 



Pfr., Pro. Zool. Soc., 1863, p. 528. 



(Shell with a nearly covered umbilicus, conoidly-globose, slightly solid, 

 uuder the leus very minutely granulated, flesh coloured ; spire 

 conical, apex smooth and rather obtuse ; whorls 5, rather convex, 

 the upper ones irregularly tuberculately-plicate, last ventricose, 

 above more lightly plicate, below radiately striated, white, in front 

 greatly deflected; aperture diagonal, sub-circular; peristome simple, 

 thin, narrowly expanded, margins approximated, columellar margin 

 widely reflected in a vaulted manner over the umbilicus. 



Diameter, greatest - 77 ; least - 63 ; height - 55 of an inch. 



Habitat. Shark Bay, Western Australia. 



The preceding description has been entirely taken from the source 

 above quoted, as I have never seen a specimen. 



115 Helix perinflata. Pfr. 



Pfr., Pro. Zool. Soc., 1803, p. 528. 



Shell umbiiicated, globose, solid, shewing wrinkled lines of growth, 

 decussated by impressed lines descending forwards, pinkish-white ; 

 spire convexly-conoid, apex obtuse; whorls 41, last large, ventricose, 

 below very much inflated, obsoletely marked with spiral stria?, de- 

 flexed in front ; aperture diagonal, lunately-rounded ; peristome 

 briefly expanded, columellar margin dilated, and reflected over the 

 narrow umbilicus. 



Diameter, greatest 093 ; least - 79 ; height 0*79 of an inch. 



Habitat. MacDonnell iianges, central Australia. Waterhouse. 



Allied to H. pomum. The description is that of Pfeiffer. 



116. Helix Blackmani. Cox. Plate XL Fig. 7, 7 a. Aus- 

 tralian Museum. 



Shell umbiiicated, globosely-turbinate, thin, not shining, eveiwwhere 

 obscurely radiately striated, and, under the lens, minutely granu- 

 lated, yellowish-horny ; spire conical, apex obtuse, suture rather 

 deep ; whorls 5, convex, quickly increasing, last very large, inflated, 

 regularly rounded throughout, strongly constricted behind the 

 mouth ; aperture diagonal, lunately-roundly-oval ; peristome simple, 

 straight, thin, much expanded, white, margins very slightly con- 

 verging, joined by a very thin callus, collumellar margin expanded 

 above, and I concealing; the moderatelv sized umbiHcus. 



Diameter, greatest 0'65 ; least 0'55 ; height 0'45 of an inch. 



Habitat. Warroo, Port Curtis, Queensland.. Blackman. 



The only two specimens T have seen, are in the collection of the Aus- 

 tralian Museum, and have a striking resemblance in form to 

 Dermatocera vitrea. It may also in some manner be looked upon as 

 connecting such shells as H. pachystyloides and DT. aridorum. 



117. Helix Macieayi. Cox. Plate VIII. Fig. 3. M.C. 



Cox, Pro. Zool. Soc, 1861. 

 Shell imperforate, depressly-globose, rather thin, smooth, shining, 



finely radiately striated, pale yellowish-brown, with a single narrow 



