T* 



The Nautilus. 



Vol. VI. NOVEMBER, 1892. No. 7 



CATALOGUE OF THE GENUS PAKTULA. 



UY \V. D. HARTMAN, M. D. 



In the following pages is offered an arrangement of the soecies of 

 the genus Partula into groups according to their natural affinities. 

 The number now known is nearly a hundred species. Specimens of 

 nearly all of which I have personally examined, either in my own 

 collection, in the magnificent collection of Harper Pease, or in the 

 museums of Paris, Geneva, etc. A description of the animal is also 

 given. 



In the next paper the geographical distribution of the leading 

 forms will be discussed. 



The animal is terrestrial and viviparous, the body covered by a 

 mantle as in Helix, blunt before, tail long and gradually tapering. 

 Tentacles four, retractile, the upper having the eyes at their tips, 

 collar and labial processes largely developed, no mucous pore, distinct 

 locomotive disc, or parallel furrows alongside of the foot ; anal and 

 respiratory orifices in the collar opening on the exterior angle of the 

 shell ; organs of generation united, the orifice behind and below the 

 right eye peduncle, matrix ample and occupying niucb space in the 

 body cavity, often containing several shells of two or three 

 whorls, beside eggs arranged in succession as developed. The embryo 

 shells exhibit spiral rows of fovea beginning at the apex, which after 

 extrusion are continued as spiral strise. The jaw is very transparent 

 and of a light horn color, slightly arcuate, and more or less atten- 

 uated at the ends ; the whole anterior surface of the jaw is furnished 



