168 PARTULA, MARQUESAS ISLANDS. 



Species of the MARQUESAS ISLANDS. 

 Section MARQUESANA n. sect. 



JEga HARTMAN, Catalogue of the Genus Partula, 1881, p. 

 11, type P. decussatula (not JEga Leach, 1815). Latia 

 Hartm., op. cit. p. 12, type P. ganymedes Pfr. (not Latia 

 Gray, 1849). 



Partulae having the embryonic shell coarsely pitted along, 

 the spirals; post-embryonic whorls with very well developed 

 spiral striation ; lip thin but often wide. Colors not bright ; 

 the cuticle thin, often deciduous; a subperipheral band fre- 

 quently present, but no others. Type P. ganymedes. 



Species of Partula are known from five of the nine high 

 islands of the Marquesan group, the others being unknown 

 eonchologically. They are distributed as follows: 



Nukuhiva: P. strigata varieties. 



Huapu: P. strigata (?), P. bellula. 



Hivaoa: P. inflata, P. ganymedes, P. bellula, P. decussatula. 



Tahuata: P. inflata. 



Fatuhiva: P. magdalinae. 



The predominance of species on Hivaoa may be due to its 

 being more fully explored. It is the largest island next to 

 Nukuhiva. The proportion of species recorded as common to 

 two islands is remarkable, if indeed it proves to be the fact. 

 It seems likely that further research would greatly augment 

 the brief list of Marquesan Partulas. 



P. spadicea Reeve, reported from the Marquesas, is a 

 Society Island form. 



Key to Marquesan Partulcz. 



Whorls over 5; peristome broad, white, strongly calloused 

 within ; shell opaque. 



a. Very obese, the diam. more than % the length ; last whorl 

 humped. P. inflata, no. 1. 



aa. Oblong-conic, the last whorl rounded. 



b. Surface partly nude, but having a band of cuticle; 

 length 20-23 mm. P. ganymedes, no. 2. 



