98 smith: descriptions of new species of helix, etc. 



indented above the conspicuous tubercle, and, between it and the 

 suture, is arched, but very little expanded. On the contrary, both 

 in front and at the base, it is more dilated and reflexed. 



Helix (Gonostoma) collingii. 



Testa orbicularis, depressa, late umbilicata, superne Juseescens, 

 infra pallida, epidermide brevi-pilosa induta ; anfractus .1-5 

 sublente accrcscentes, convexiusculi, sutura profunda sefu/icti, 

 /iiwis incrementi tenuibus punctisque minutis undique sculfiti, 

 ultimas ad peripheriam rotundatus, antice vix descendens, 

 superne pone labrui/i kviter impressus; apertura fere horizontalis, 

 rotunde triangularis ; perisl. superne anguste expansum, margine 

 columellari latins rcfiexo, basali intus subdentato. Diam. maj. 

 10 m ill i m., mill. 8.', alt. 4. 



Habitat: Baudin Island, \.\V. Australia (J. J. Walker). 



Shell flatly discoidal, with the spire only very 

 .^ "\ little raised above the body-whorl, rather openly 



umbilicated, light brown above and pale beneath. 



When in fresh condition the surface is covered with 

 a thin shortly pilose epidermis. Worn shells exhibit innumerable 

 minute punctures showing where the short delicate setae have 

 been. Whorls 4. 1 ,, regularly and rather slowly increasing, 

 moderately convex, and separated by a deep sutural line, besides the 

 punctures, exhibiting fine lines of growth ; last whorl rounded at the 

 periphery, only very feebly deflexed close to the aperture, and 

 exhibiting a slight depression above about the middle of the upper 

 margin of the peristome. Aperture somewhat triangular in outline 

 but with rounded angles, almost horizontal in position ; peristome 

 narrowly reflected above, more broadly expanded along the basal 

 margin, especially over the umbilicus. A conspicuous tubercle or 

 prominence occurs on the inner edge of the basal margin and a less 

 pronounced one within the upper margin corresponding to the 

 slight depression upon the outer surface of the whorl. 



I have much pleasure in naming this very interesting species 

 after Mr. W. E. Collinge, the energetic editor of this Journal. 



Rissoina walkeri. 



Testa fusiform i-ovata, crassa, lurrita, alba; aufractus 8,primt 

 quinque conum obtusum formantes, plant, hand turriti, longitudin- 

 alitcr confertim costulati. spiralitcr striati, ires ultimi conspicue 

 tabulati et angulati, costis crassiusculis superne ad angulum 

 intcrruptis instructi, striisque confertis tenuibus spiralibus inter 



