18 DR. J. C. COX ON NEW LAND-SHELLS. [Jail. 2, 



oesophageal muscular sheath is quite as red and comparatively as 

 thick as in Ruminantia, and even more completely composed through- 

 out its length to its cardiac end of transversely striated muscular fibre 

 than in this order. 



5. Descriptions of new Land- Shells from Australia and the 

 South-Sea Islands. By James C. Cox, M.D., of Sydney, 

 New South Wales. 



[Received December 4, 1871.] 

 (Plate IV.) 



1. Helix (Helicostyla) croftoni, sp. now (Plate IV. 

 fig. 1.) 



Shell imperforate, rather solid, conoid-glohose, obliquely trans- 

 versely striated, yellow, ornamented with dark chestnut or blackish 

 zones and lines of various widths, one, in particular, always beneath 

 the suture, and another at the base round the umbilical region, the 

 intervening space between these two lines being more or less oc- 

 cupied with narrow lines; spire raised, conoidly rounded, suture 

 impressed, margined with a white thread ; whorls 7, convex, last 

 whorl descending in front ; aperture lunar-oval, pale violet within ; 

 peristome straight, whitish, expanded and moderately reflexed 

 throughout, margins joined by a rather thick glossy callus ; colu- 

 mella solid, slightly curved, dilated and impressed, strongly ad- 

 herent to the body-whorl, occluding the umbilicus. 



Diam., greatest 1*65, least T34 ; height 1*60 inch. 



Hab. Hydrometer River, west of Port MacKay, Queensland, Aus- 

 tralia ; found inside the hollow trunks of quangdong trees. 



This species appears to be very local in habitat ; its characters 

 participate in those of Helix blomfieldi, Cox, and Helix coxi, 

 Crosse. 



km. 2. Helix (Hadra) parsoni, sp. nov. (Plate IV. fig. 2.) 



Shell with a large deep open umbilicus, transversely finely striated, 

 globosely conical, dark purple-black, much lighter towards the apex, 

 where it is indistinctly ornamented with fine spiral lines ; spire 

 raised, obtusely conical, suture distinctly margined with a narrow 

 white line ; whorls 7h, convex, gradually increasing in size, last 

 produced and deflected in front, base flattened ; aperture diagonal, 

 ovately lunar, livid within ; peristome of a purplish white colour, 

 very slightly thickened, expanded and reflexed throughout ; margins 

 approximating, joined by a thin glossy callus, columellar margin 

 triangularly dilated, overhanging the large umbilicus. 



Diam., greatest 1*42, least 1 -09 ; height 153 inch. 



Hab. Gayndah, Queensland, Australia. 



This species, in general aspect, is very like some of the smaller 



