162 LITTORINIDA. 
the suture ; undulately “waved ” or subimbricate at the suture, 
asin Descr. de l’Egypte, Pl. V, fig. 35, which indeed gives 
perhaps a better’ idea of this Andaman species than of the 
Red Sea form; intermediate forms will probably occur to 
connect the two ? 
4 Andamans; coll. Capt. R. C. Temple. 
var. subimbricata. 
With the uniform yellowish coloration of the typical form 
and the peculiar subimbricate sculpture at the sutures and 
periphery of the preceding variety. 
6 Andamans; coll. Capt. R. C. Temple. 
1l. Risella [Peasiella], n. sp. 
1 Muscat; coll. W. T. Blanford, Esq. 
A very small form, with peculiar, perfectly. flattened spire ; 
below the acute periphery there is a deep and broad sulcation, 
the rest of the base appearing smooth, though under the lens 
a minute striation can be detected. The umbilical perforation 
is very small. 
Genus PHANETA, H. Adams. 
P. Zool. S. 1870, type P. everetti, H. Adams [Siniwar Rv., Borneo]. 
The correct classification of this Genus appears to be still very 
doubtful. Phaneta is not as yet represented in the Museum. 
Genus FOSSAR, Gray. 
Syn. Brit. Mus. 1840, type Helix ambigua, Lin. ;=Fossarus, Philippi, 
1841 ; sect.—Clathrella, Recluz, J. de ©., XII, 1864, types Foss. 
costatus, Broechi, and Foss. minutus, Michaud. 
A. Adams figured a Fossar bicarinatus inthe P. Z. 8. for 
1853 from the Red Sea ; he describes the operculum as “ horny, 
oval and subspiral.” 
1. Fossar ambiguus. 
Helix ambigua, Linneus, Syst. Nat. 1758, Mediterranean ;==“ le Fossar,? 
Adanson, 1757, Senegal ;=Fossarus adansonii, Recluz [? not of Phil.] 
