334 Mr.J.S. Baly on new Genera and Species of Hispide. 
other genera the tentacles are ciliated, and also, in some species, 
other parts of the body. Mr. Clark was not more happy in his 
conjecture that Homalogyra Rota was the fry of Cecum Trachea, 
~ the natural history of which this accomplished malacologist had. 
so successfully mvestigated. Iam not aware, indeed, that these 
shells or their animals have any character in common; besides 
which, it may be observed that the operculum of Homalogyra is 
flat and paucispiral, with an excentric nucleus, while that of 
Caecum is more or less conical and multispiral, with a central 
nucleus, as in Vermetus. (Since this paper was read, I have 
received from the Marquis James Doria specimens of the young 
of C. Trachea, which he had dredged at Spezzia. The terminal 
part or spire is very different from that of H. Rota.) 
The sexes in Stilifer appear to be separate, as may be seen 
from my description of the animal of S. Turtoni. 
The shell of this species has been often described; but I will 
briefly allude to some of its characters, which have not been 
satisfactorily stated. The spire, for the first three whorls, is 
cylindrical and narrow ; it then enlarges suddenly and dispropor- 
tionately, and consists of three or four more whorls, which are 
rounded and extremely ventricose or swollen. The apex or nu- 
cleus of the spire is not reversed, although often set obliquely ; 
it projects like the stump of a flagstaff which had been stuck in 
a slanting position on a steep mound. The columellar lip, in 
adult and perfect specimens, is slightly reflected. The lower 
part of the mouth is semicircular ; it is not effuse or spread out- 
wards, as in Eulima or Aclis. 
XXXVII.— Descriptions of Genera and Species of Hispide. 
By J. S. Baty. 
[Continued from p. 271. ] 
Genus ALuRNus, Fabr. 
Alurnus Batesii, n. sp. 
A, oblongus, niger, nitidus; thorace rubro; elytris fulvo-flavis, ma- 
culis magnis tribus, triangulariter dispositis, punctoque humerali 
nigris. 
Long. 11 lin. 
Hab. Ega, Upper Amazons. Unique in the collection of 
Mr. Bates. 
Oblong, shining black; thorax red; elytra bright fulvous 
yellow, three large patches on their surface, together with a 
small spot on each humeral callus, black. Head irregularly 
