UNIVALVES. — TROCHUS. 



lir 



Melanastomus — Black-throated. Purpurascens — Purple. 



*Striatu5 — Striated. 

 ♦Minutus — Crimson-tip. 

 Punctulatus — Rose-colour' d. 

 Conulus — Conical. 

 *Zizyphinus — Livid. 

 *PapilIosus — Granulated. 

 Undatus — Undulated. 

 Gran a turn — Tiger. 

 Virgineus — Ringed. 

 Diaphanus — Thin. 

 Selectus — Red- and-ivhite. 



Imbricatus — Imbricated. 

 Caelatus — Scaly. 

 Gibberosus — Olive-green. 

 Virgatus — Rose-striped. 

 Cookii — Cook's. 

 Iris — Iris. 

 Elegans — Elegant. 

 No tat us — Marked. 

 *Ziczac — Ziczag. 

 Obtusus — Blunt. 

 Crocatus — Saffron-colour' d. 



Hortensis — Garden. 



Family 2. — With the pillar toothed. 

 Labeo — Double -lipp'd. Turbinatus — Turbinated. 



Asper — Rugged. Argyrostomus — Silver-mouth' d, 



Quadricarinatus — Four-keeled. Merula — Chinese. 

 Tessellatus — Tessellated, *Cra3sus — Heavy. 



Amei-icanus — American. 



Family 3. — With the pillar twisted. 

 Mauritianus — Great-tooth' d. Pyramis — Obelisk. 

 Fenestratus — Small-tooth' d. Dentatus — Sugar-loaf. 



Family 4. — Shell convex, smooth, with a thick vitreous matter 



[which covers the centre of the base. 



Vestiarius — Flattened. 



Division III. — Shell tapering, with the pillar exsert- 



ED, and the shell FALLING TO ONE SIDE WHEN 

 PLACED UPON ITS BASE. 



Family 1. — With pillar twisted. 

 Telescopium — Telescope. Terebellus — Little-augur. 



Dolabratus — Zebra. 



Family 2. — Pillar straight. 

 Minute Shells. 



Punctatus — Dotted. 



Striatellus — Violet-lipp' d. 



