PLATE CLV. 



FIG. II. II. 

 TROCHUS CINEREUS. 



ASHEN TOP SHELL. 

 SPECIFIC CHARACTER. 



Shell pyramidal, umbilical, cinereous ; marked with narrow blackish 



lines. 



Trochus Cinereus : pyramidalis umbilicatus, cinereus, lineis 

 angustis nigrescentibus notatus. Da Costa. Brit. 

 Conch, p. 42. sp. 23. tab. 3. Jig. 9. 10. 



Trcchus pyram, parvus, ex viridi sive subcseruleo variegatus, in- 

 signiter umbilicatus. List. H, Conch, tab. 633. 

 J^-21. 



This shell is described and figured by Da Costa from the specimen 

 at present in our possession ; the only inducement we have for in- 

 serting it, for though this writer observes that it is a common shell 

 on several of our coasts, we must acknowledge it has never occurred 

 to us as a British shell. Exotic specimens we have, but these are 

 said to have been brought from the South Seas. Da Costa, we have 

 a strong suspicion was mistaken concerning this shell ; his reference 

 to Lister is correct ; the rest of his synonyms, namely, those of Dale, 

 Walk's, &c. are erroneous, since those writers meant a very different 

 shell. The following is the jninute description Da Costa gives of 

 this kind : 



" The shell is thick and strong, of the size of a cherry; shape 

 obtusely pyramidal, or not quite tapering to a point. 



