334 Mr. J. S. Baly on new Genera and Species of Hispidae. 



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 Ccecum Trachea, 

 the natural history of which this accomplished malacologist had 

 so successfully investigated. I am 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 

 Cacum 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. TVachea, 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 Hispidae. 

 By J. S. Baly. 



[Continued from p. 271.] 



Genus Alurnus, Fabr. 



Alumtts Batesii, n. sp. 



A. oblongus, niger, nitidus ; tliorace rubro ; elytris fulvo-flavis, ma- 

 culis magnis tribus, triangulariter dispositis, punctoque humerali 

 uigris. 



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 



