soweeby: on new species op mollusca. 19 



This species is allied to P. tmiens, Gmel. (the type of the genus), 

 which is also West African. It is distinguished by its obliquely 

 trigonal form, being much higher in proportion from the umbones to 

 the ventral margin. 



EXPLANATION OF PLATE L 



Fig. 1. Vrosalpinx Walheri, n.sp. 



,, 2. Liotia Walkeri, n.sp. 



,, 3. Natica Bougei, n.sp. 



,, 4. Turbo granoliratus, n.s^. 



,, 5. Sistrum chrysalis, n.sp. 



,, 6. Chlamys Smithi, n.sp. (right valve). 

 ,,7. ,, ,, (left valve). 



,, 8. Pitaria elata, n.sp. 



,, 9. Amalthea Coxi, n.sp. (type). 

 ,, 10. ,, „ var. 



,, 11. ,, ,, var. 



