The Conchologist: 



Jl journal of /Bbalacologg. 



Vol. II. MARCH 25th, 1S93. No. 5. 



DESCRIPTIONS OF NEW SPECIES OF HELIX, 

 RISSOINA AND ACT>EON. 



By EDGAR A. SMITH, F.Z.S., 

 Zoological Depart/noil, British Museum, London. 



Helix (Gonostoma) baudinensis. 



Testa discoidea, late perspective umbilicata, dilute fuscescens ; 

 anfractus 4 couvexiusculi, sutura profunda disereti, costis 

 numerosis crassiusculis obliquis leviter undulatis instructi, pritni 

 duo laves, uttimus versus aperturam scrobiculo hand profunda 

 elongato supra impressus, pone labrui/i constrictus, valde 

 descendens ; apcrtura contracta, auriformis ; perist. albidum, 

 leviter, expansum et reflexum, intiis tuberculo conspicuo alioque 

 minore basali coarctatum. Dia/n. tnaj. 6 millim., min. 5. 



Habitat : Baudin Island, N.W. Australia (J. J. Walker). 



The principal features of this little species are 

 its depressed and openly umbilicated form, the 

 strong costulations, and the contracted dentate 

 aperture. The shallow depression upon the upper 

 surface of the last whorl commences behind the peristome, and, 

 running parallel to but a little distance from the suture, extends 

 about half-way round. The upper margin of the peristome is 



Conchologist, vol. ii., pt. 5. 



