SCUTIBRANCHIATA. 
41 
M. Moquln Tandon, who is not addicted to di- 
viding species with too great minuteness, divides 
these shells into four species, and separates them 
into two sub-genera ; I have not been able to verify 
the accuracy of the subdivision. 
1. AumcELLA. Shell with elevated ridges, Aper-‘ 
ture sinuous^ slit obliquely in the front part in 
a line with the suture, 
A. (Auricella) lineata, t. 38. f. 4 — 7. — Shell red- 
dish yellow, with distant ridges, whorls rather de- 
pressed; aperture with a short oblique slit; the 
peristome sub-continuous. (Auricula lineata. Drap, 
Hist, t. 3. f, 2021.) The shell is sometimes nearly 
smooth. 
2. Platyla. Shell smooth^ aperture Jlat^ without 
any slit in the upper part, 
A. (platyla) fusca, t. 38. f. 8. 16. — Shell very 
smooth, reddish yellow; whorls slightly convex, 
peristome nearly continued. (Turbo fuscus. Walker^ 
T, M, Ear, 112. f. 42. — Aurychium lineatum. 
Ross, Jun, f. 408.) 
Order II. SCUTIBRANCHIATA, 
Gills consisting of two series of lamellse, forming 
one or two series over the back of the neck, or 
under the edge of the mantle round the foot; rec- 
tum often traversing the heart. Animal herma- 
