Mr. F. P. Marrat on a new Species 0/ Trivia. 215 



9, Oliva shnilis, Marrat. 



Shell ovate-cylindrical, inflated ; spire small, canaliculate, 

 apex dark ; colour from light drab to dark yellowish brown, 

 with light-brown or purplish wavy lines, and sometimes dark 

 angular spots forming two interrupted bands ; suture edged 

 with fine purple pencilled lines ; interior purplish brown ; co- 

 lumellar plaits numerous. 



10. Oliva pallida, Marrat. 



Shell cylindrically fusiform ; spire short, conical ; colour 

 white or very pale, with faint flexuous lines and two pale brown 

 bands ; interior either white or light pink. 



Eastern Seas. 



Obs. In collections this shell is not uncommon, named O, 

 literata, O. scripta, or 0. reticularis. It differs from all in 

 having a short spire and pale interior. 



11. Oliva ohlonga, Marrat. 

 (Duclos, plate 9. figs. 3 & 4, reticularis, var.) 



Shell oblong-fusiform, very thick ; spire conical, elongate, 

 canaliculate ; colour yellowish white sufi"used with ash-grey, 

 with brown wavy markings, generally crowded so as to form 

 two indistinct bands; interior cream-coloured; plaits almost 

 obsolete. 



Central America. 



Obs. Most conchologists, when examining this shell, pro- 

 nounce it distinct. 



12. Oliva truncata, Marrat. 



Shell cylindrically ovate ; spire rather shortly conical, apex 

 papillose; colour greyish, with zigzag dotted brown mark- 

 ings ; suture canaliculate, edged with pencilled brown lines ; 

 aperture very pale purple, almost white. 



Cape of Good Hope. 



Obs. Shell much narrower than 0. palpasta, without the dark- 

 brown spots, and from a very different habitat. 



On a new Trivia. 

 Trivia affinis, Marrat. 



Shell oblong-ovate, transversely coarsely ribbed ; beaks pro- 

 jecting, broad; teeth acute, dorsal groove obsolete; very pale, 

 but indications of colour in one of the specimens. 



Obtained from a dealer's stock among West-Indian species. 



Obs. Resembles a large T. insecta, Mighels, but may at once 

 be known by its coarse ribs and obsolete dorsal groove. 



