BY THE REV. J. E. TENISON-WOODS, 1007 



Helix it is no use to catalogue species without adopting sectional 

 divisions, which has been done in the present list. It must 

 be admitted that they are not easy to identify, as the features 

 are so feeble, and there is so little to go upon. Still the sections 

 may be of some assistance, and they are meant to have no higher 

 value in classification. 



With the genera it is different, and except in such a case as 

 Nanina the divisions are well marked, and can hardly be mistaken 

 one for another. In the smaller genera the features are very 

 pronounced, that is genera small in point of numbers, not of size. 

 J believe it may farther be said that all the species of the genera 

 Trochomorpha, Btdimus, Cydotus, Cyclophorus and Alycceus, 

 though perhaps not well distinguished from one another, are 

 referable to a type which has certain well-defined geographical 

 limits. With a little experience a species of Cyclophorus, for 

 instance from the Malayan Peninsula, could be easily recognized 

 as belonging to the region ; but it would require a prolonged 

 familiarity to distinguish between the characteristic types of the 

 various islands, as for instance Java and Sumatra. The Bornean 

 shells are easily recognized, though there are strong resemblances to 

 the types of the Philippine Islands. 



Amongst the shells enumerated there is no foreign element. No 

 molluscan animals, as far as it is known, have been introduced 

 from foreign regions, and become naturalized in the region now 

 described ; but the large introduction of European and Chinese 

 plants will alter this state of things before long, if it has not done 

 so already. 



The following list has been taken from various sources. No 

 special study has ever been made of the land moUusca of the 

 Malayan Archipelago. But owing to the labours of Pfeifier and 

 Albers, the task of compiling this list has been very much 

 facilitated. The whole references in the case of every species 

 have not been given. As far as possible the references are made 

 to three or four of the most easily accessible works, where more 

 than one author has given a description. The work of Pfeifier 

 G4 



