230 BERMUDA. 



The genera are as follows : — 1. IVochusidee. The 

 species of this genus are the Trochus Zizyphinus, the 

 Trochus cinerarius, the Trochus maculata (spotted 

 Trochus), and the Trochus jujuhinus ; which last is 

 remarkable for its peculiar colouring; the upper 

 whorls being blackish, whilst the apex and two last 

 are red or flesh-coloured. Many species are very 

 iridescent at the mouth and under the epidermis. 



2. Genus Turbo. — The species of this genus are 

 the Turbo littoreus, or common periwinkle, which 

 is used as an article of food, and is found on the 

 shores in great numbers. The shells are often 

 highly iridescent; and the mouth, in some species, 

 as in the Turbo chrysostomus, is of a deep and beau- 

 tifal golden colour. The Turbo pica is a very hand- 

 some species. 



3. Genus Phasianella. — The shells of this genus 

 are smooth, shining, without an epidermis, and orna- 

 mented with agreeable colours. The Phasianella 

 rubeus is a beautifully coloured species. 



4. Genus Nerita. — The Neritce are all marine 

 shells, solid, thick, and agreeably coloured. They 

 are remarkable for their oblique columella, relative 

 to the axis of the shell, which gives the opening a 

 semicircular form. We have a familiar example of 

 the genus in the Nerita peloronta. It is called 



