56 CLASS GASTEROPODA. 
SOLARIUM, Lam., 
Is distinguished from all other trochi by a very broad conical 
spire, at the base of which is an extremely wide umbilicus, in 
which may be seen the external edges of all whorls, marked 
by a crenated cord. (Tr. perspectivus, I..) 
EVOMPHALUS, Sowerby. 
Fossil shells, resembling a solarium, but wanting the denta- 
tions on the internal whorls of the umbilicus. (Hvomphalus 
pentangulatus, Sowerb.) The genus 
TuRBO, Lin., 
Comprehends all the species with a completely and regularly 
turbinated shell, and a perfectly round aperture. Close obser- 
vation has caused them to be greatly subdivided. 
TURBO (proper), Lam. 
The shell is round or oval, and thick ; the aperture is com- 
pleted on the side next to the spire by the penultimate whorl. 
The animal has two long tentacula, and the eyes placed on 
pedicles at their external base ; the sides of the foot are pro- 
vided with membranous wings, sometimes simple, at others 
fringed, and occasionally furnished with one or two filaments. 
To some of these belong those petrous and thick opercula 
which we see in cabinets, and which were formerly employed 
in medicine under the name of wnguis odoratus. 
Some of them, MELEAGER, Mont/., are umbilicated. 
(Turbo pica, L., &c.) 
Others are not. (TursBo, Montf.; Turbo petholatus, 
List., &c.) 
DELPHINULA, Lam. 
The shell thick, as in turbo, but convoluted nearly in the 
