300 MELANIINiE. 



Sub-gen. megara, H. and A. Adams. 



Shell ovate, solid, whorls transversely sulcate ; aperture 

 ovate-oblong, sub-canaliculated anteriorly; outer lip thin, simple, 

 acute. 



alveare, Conr. lateralis. Lea. 



arctata, Lea. lima, Conr. 



auriculfeformis, Lea. oliva. Lea. 



basalis. Lea. olivula, Conr. 



brevis, Lea. ovalis, Lea. 



crebristriata. Lea. pumila. Lea. 



harpa, Lea. solida, Lea. 



Haysiana, Lea. torquata. Lea. 



Hoeydei, Lea. undulata. Say. 



impressa, Lea. Vanuxemiana, Lea. 



Genus TRICULA, Benson. 



Shell elongately oval ; spire produced, apex more or 

 less truncated, last whorl rounded, slightly umbilicated ; 

 aperture ovate, entire in front, peritreme continuous, 

 subreflexed. 



Ex. T. montana, Benson, pi. 32, fig. 5. Operculum, 

 T. montana, fig. 5, «, 5, h. 



The animal of Tricula has an elongated proboscis and 

 filiform tentacles with the eyes at their outer bases ; in its 

 thickened inner lip, the shell somewhat resembles Palu- 

 domus, but it is distinguished by its elongated spire and 

 truncated apex ; the only species known is an inhabitant 

 of the river Kamaan, in India. 



