NEW AND OLD LAND SHELLS FROM THE ISLAND OF 

 LUZON, PHILIPPINES 



By Paul Bartsch 



Curator of MoUusks and Cenozoic Invert e'brates, United States National Museum 



I 



Several small sendings of land moliusks from the island of Lnzon 

 transmitted to the United States National Museum for determina- 

 tion by the Philippine Bureau of Science, have necessitated a revision 

 of certain species of Cochlostyla, the results of which are given in 

 the following pages. There are also added descriptions of a new 

 species of Leptopo?na and a new subspecies of Obba and /Sulfurina^ 

 which were included in the same sending. 



The illustrations accompanying this paper are from photographs 

 made by the Division of Photography, United States National 

 Museum, and retouched by Mrs. Aime M. Awl. 



COCHLOSTYLA DUBIOSA Pfeiffer 



In the genus Cochlostyla, there is probably no species which 

 to-day presents a greater confusion of elements in collections than 

 exists in the complex which is usually designated under the fore- 

 going name. This has been largely caused by the fact that the 

 collectors of old were not cognizant of the important role of what 

 is to-day called Zoogeographic distribution. Then it was not known 

 that most species or their races have a rather limited locus. The 

 early collector therefore usually placed specimens of more or less 

 superficial resemblance together and a label " Philippine Islands," 

 seemed quite adequate to denote their country. Cuming, the most 

 prolific of the earl}^ Philippine collectors, did somewhat better, as a 

 rule, by citing the island from which his specimens came. 



The describers of species, working upon Cuming's collections, 

 cautiously gave a wide distribution to many of the forms described 

 by them. Many of the forms cited as coming from islands other 

 than those from which the type came, have since been recognized 

 as distinct species or subspecies by later writers. 



Pfeiffer in describing Helix dublosa in 1845 in the Proceedings of 

 the Zoological Society of London (pp. 125-6) says: "This is the 



No. 2848— Proceedings U. S. National Museum, Vol. 78, Art. 5 

 2608—30 1 1 



