GASTEROPODA PECTINIBRANCHIATA. 357 



with it, as fast as it increases in size, various foreign bodies, 

 such as little pebbles, fragments of other shells, 8cc.; it fre- 

 quently covers its umbilicus with a testaceous plate(l). 

 The margin of others, however, is rounded, such as 



TV. cinerarius, L. ; Chemn., V, clxxi, 1686. A small species, 

 and the most common on the coast of France; greenish, obliquely 

 streaked with violet. 

 Some umbilicated Trochi have a prominence near the bottom of 

 the columella(2), 



And, finally, there are others in which it is longitudinally cre- 

 nate(3). The 



Solarium, Lam. 



Is distinguished from all other Trochi by a verybroad conical spire, 

 at the base of which is an extremely wide umbilicus in which may 

 be seen the internal edges of all the whorls, marked by a crenated 



cord(4). 



EvoMPHALus, Sowerby. 



Fossil shells resembling a Solarium, but wanting the dentations on 

 the internal whorls of the umbilicus(5). The genus 



Turbo, Lin. (6) 



Comprehends all the species with a completely and regularly turbi- 

 nated shell, and a perfectly round aperture. Close observation has 

 caused them to be greatly subdivided. In the 



Turbo, Lam. 



The shell is round or oval, and thick; the aperture completed on 

 the side next to the spire, by the penultimate whorl. The animal 



(1) Add; Trochus indicus, Chemn., V, clxxii, 1697 — 98;— Tr. imperialis, 

 clxxiii, 1714, and clxxiv, 1715;— TV. Solaris, lb., 1701— 1702, and 1716— 1717; 

 —Tr. planus, lb., 1721, 1722. 



(2) Tr. virgatus, Chemn., V, clx, 1514 — 15; — Tr. niloticus, Chemn., V, clxvii, 

 1605 — 7, clxviii, 1614; — Tr. vermis. Id., clxix, 1625 — 26; — Tr. inxqualis, 

 clxx, 1636 — 37; — Tr. magnus, clxxi, 1656 — 57; — Tr. conspersus, Gualt., Ixx, 

 B.; — Tr. jujubinus, clxvii, 1612 — 13. 



(3) Tr. maculatus, clxviii, 1615 — 1616; — Tr. costatus, clxix, 1634; — Tr. viri- 

 dis, clxx, 1644; — Tr.radiatus, lb., 1640 — 42. 



(4) Tr. perspedivus, L. Chemn., V, clxxii, 1691 — 96; — Tr, stramineus, lb., 

 1699;— Tr. variegatus, lb., 1708— 1709;— Tr. infundibuUformis, lb., 1706—1707. 



(5) EvompJialus pentangulatus, Sowerb., Min. Conch., I, pi. xlv, f. 2; — Ev. no- 

 dosus. Id., xlvi, &c. 



(6) This great genus constitutes the family Cricostoma of Blainville. 



