On the Characters of Astele. 39 



Colour pale fawn, or issabella, clouded with faint transverse 

 waves of rufous. 



Margin of the body whorl, slightly carinated ; there is 

 a depression between the margin and the second elevated 

 strise on the upper surface, the first, or that next the margin, 

 being very slender. The strige beneath assume the appear- 

 ance of grooves, which are wider apart as they approach the 

 umbilicus; and the three more immediately adjoining are 

 crossed by transverse strise, which produces a granulated 

 appearance, somewhat similar to that of Solarium persjyec- 

 tivum. 



There are no longitudinal strise, however slight, on the 

 surface. The umbilicus is pure white, and the inner surface 

 of the aperture reflects the striae on the upper surface. 



Ohs. — The union of characters thus afforded between this 

 new form and Solarium induces me to think that the two 

 genera should follow each other without the intervention 

 of Monodonta and its subgenera, as Elenchus, &c. 



In the same collection with the above icteresting shell I 

 observed another of the same natural family, which, as I 

 have never met with it before, and as being in all probability 

 peculiar to this Island, I shall now describe ; — 



It belongs to a division of those Trochidious shells which, 

 as having a thick calcareous operculum, have long ago been 

 separated under the name oWanthorbis,^m contradistinction 

 to that of Trochus, where the operculum, or lid of the animal, 

 is invariably thin and horny. 



Carinidea Jimbriata. Plate VI., figs. 3 and 4. 

 The Fringed ridged Trochus. 

 Shell higher than broad, marked above with narrow uniform 

 longitudinal ribs, crossed by delicate imbricated strise; suture 



* Swainson's Shells and Shell Fish. Lardner's Cyclopedia, page 349. 



