FEB., igio. Two NEW PULMONATE MOLLUSKS BALL. 221 



usually lighter against a darker ground because a trace of the paler 

 periostracum remains in them, and the rotundity of the upper part 

 of the whorls which is reflected in the evenly arcuate upper part of the 

 outer lip. The specimens vary more or less in size as the measure- 

 ments indicate, but the number of the whorls remains constant. 



The name of this species is derived from the Greek Kdiiapa, an 

 arch; not the Latin camera, a chamber. 



Besides the above Mr. Dorsey obtained from Lake Lanao, Min- 

 danao, Philippine Islands, collected near Camp Kerthley by Mrs. 

 Mary Strong Clemens, the following forms of Vivipara for which that 

 lake is noted, and which have been recently described by Dr. Paul 

 Bartsch in the Proceedings of the National Museum from other 

 collections. 



Vivipara partelloi Bartsch. 



Vivipara mearnsii Bartsch. 



Vivipara pagodula Bartsch. 



Vivipara lanaoensis Bartsch. 



Vivipara lanaoensis var. kappa Bartsch. 



Vivipara lanaoensis var. gamma Bartsch. 



Vivipara lanaoensis var. eta Bartsch. 



Vivipara clemensa; Bartsch. 



