1873.] AUSTRALIA AND THE SOLOMON ISLANDS. 149 



fringe ; aperture obliquely roundly lunate, angled at the periphery ; 

 margins simple, thin, inserted at the carinated periphery, columellar 

 margin triangularly dilated at its insertion, half covering the um- 

 bilicus. 



Diam., greatest 1-17, least 1*08 ; height 0*80 of an inch. 



Hab. On a mountain, Lord Howe's Island. 



In my own collection. 



Helix yatalaensis, sp. nov. (Plate XVI. figs. 3 a, 3b.) 



Shell with a moderately large open umbilicus, depressedly orbicular, 

 rather solid, obsoletely striated, coarsely granular above, pale chestnut 

 below, ornamented around the umbilicus with a broad chestnut ring ; 

 spire slightly raised ; whorls 5| to 6, convex, gradually increasing in 

 size, rounded at the periphery, obsoletely carinated ; aperture lunately 

 ovate, oblique ; peristome pink, narrow, slightly thickened, ex- 

 panded, and very slightly reflected in front at the insertion ; colu- 

 mellar margin triangularly dilated, overhanging the umbilicus. 



Diam., greatest 0'30, least 020 ; height - 18 of an inch. 



Hab. Yatala, Albert river, Queensland. 



In my own collection. 



Helix serena, sp. nov. 



Shell rather largely and deeply umbilicated, obliquely coarsely 

 striated above, smoother below, pale horny yellow-brown ; spire 

 broadly depressed, conical ; whorls 7, rounded, very slowly in- 

 creasing in size, last rather sharply carinated at the periphery ; base 

 very convex ; aperture broadly irregularly trapeziform ; lip simple 

 above, thickened and everted below ; columella triangularly dilated ; 

 margins of aperture joined by a thin callus. 



Diam., greatest TOO, least - 80 ; height - 64 of an inch. 



Hab. Solomon Islands. 



In Mr. Hargraves's collection. 



Helix fatigata, sp. nov. (Plate XVI. figs. 4 a, 4 b.) 



Shell with a large deep open umbilicus, lenticular, flatly conoidly 

 depressed, obliquely, coarsely striated above, much finer below, of a 

 light yellow-brown colour, lighter at the base ; apex bluntly rounded ; 

 whorls 6, flatly obliquely margined and pinched at the suture, last 

 whorl sharply and flatly keeled at the periphery ; base shining, 

 excavated round the umbilicus ; aperture broadly angularly lunar ; 

 lip simple ; margins slightly approximating, lower margin somewhat 

 thickened, columellar margin not dilated, inserted at the margin of 

 the umbilicus. 



Diam., greatest - "2, least 0'61 ; height 035 of an inch. 



Hab. Solomon Islands. 



In my own collection. 



Helix (Geotrochtjs) gelata, sp. nov. (Plate XVI. figs. 5 a, 

 5 b.) 



Shell conoidly depressed, rather narrowly umbilicated, of a dark 



