532 bartsch: subspecies of leptopoma nitidum 



« 



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ZOOLOGY. — A key to the subspecies of Leptopoma nitidum 

 Sowerby of the Philippine Islands. Paul Bartsch/ U. S. 

 National Museum. 



In the preparation of the monograph on the Phihppine oper- 

 culate land shells, so many interesting and important facts are 

 presenting themselves that it is deemed wise to publish a syn- 

 opsis of the various groups and superspecies from time to time, 

 with the hope that these synopses and keys may stimulate 

 collectors to look for material in localities which so far have 

 remained unworked, in order that the final monograph may give 

 us a more complete resume of the members constituting the 

 Philippine Island faunas. It is for this purpose that the present 

 synopsis and key to the Philippine land shells of the Leptopoma 

 nitidum complex have been prepared. 



Leptopoma nitidum 



Shell polished, shining, white, excepting the tip, which, in some of 

 the subspecies, is dark. The earliest part of the nepionic turns are 

 smooth, while the succeeding portion is marked by slender, equal and 

 equally or sub-equally spaced spiral threads which vary in number 

 from five to eight in the different subspecies. These spiral lirations 

 terminate with the nepionic whorls in some of the subspecies, while in 

 others the}' extend for almost two turns beyond it. The nepionic 

 whorls are also marked by strong incremental lines which frequently 

 give the summit of the turns a slightly crenulated appearance. Post- 

 nepionic whorls strongly inflated, rounded, marked by incremental 

 lines and spiral striations which vary in strength and closeness of spac- 

 ing in the different subspecies. Suture strongly constricted. Periph- 



1 Published by permission of the Secretary of the Smithsonian Institution. 



