THE 



JOURNAL OF MALACOLOGY. 



No. 3. September 29th, 1902. Vol. IX. 



ON THE NON-OPERCULATE LAND AND FRESH- 

 WATER MOLLUSCS 



collected by the Members of the "Skeat Expedition" in the Malay 

 Peninsula, 1899-1900. 



By WALTER E. COLLINGE, B.Sc , 



The University, Binningh;ini. 



(Plates iv-vi.) 



Introduction. 



Of the collection of Land and Freshwater Molluscs obtained by the 

 members of the " Skeat Expedition " in the Malay Peninsula, Dr. 

 Harmer has invited me to furnish a report upon the non-operculate 

 species. 



The collection is not a large one, comprising representatives of 

 only 29 species, which are contained in 22 genera; of these 11 species 

 and 3 genera are new. 



The most interesting species are those belonging to the genus 

 Atopos, Simr., which has not hitherto been recorded from the Malay 

 Peninsula ; unfortunately the new species are nearly all represented 

 by single examples. Parajiarniafion, Apoparinarion, and Cryptosemelus 

 are new and interesting genera, placed at present in the family 

 Girasiidae. 



A number of specimens of the animals of Hemiplecta JiumpTirey- 

 siana, Lea, were collected, which has enabled me to give some details 

 of the anatomy. I am also able to make a further contribution to our 

 knowledge of the internal structure of the genus Ampiliidromus, Albers, 

 by a description of various internal parts of A. pervers%is, L. 



Of the shells, the most interesting are the two new species of 

 Sfrepfariif, and the very small new species of Hyp^elostoma. 



Previous collections from these regions have been described by 



JoUKN. OK Malac, 1902, vol. ix. No. 3. 



