RUTHVEXIA. 



29 



riectopylis (Si/fccsia) clathratnla, Glide, op. cit. vi, 1899, p, 149. 

 Helix puteoln.<!, Benson, A. M. N. H. ser. 2, xii, 1853, p. 92 ; Reeve, 

 Conch. Icon, vii, 1854, pi. 190, tig. 13.'U. 



Oi'iginal description :~''T. late umbilicata, leuticularis, acute 

 carinata, superne liris elevatis (in quovis anfractu 2) et co.stis 

 distinctis clathrata, parum nitens, cornea ; spira parum elevata, 

 obtusiuscula : anfract. 5 subteqiiales, vix convexiu.sculi, ultimus 

 basi radiato-striatus, circa uinbilicuni subinilatus ; apertiira verti- 

 cah's, angusta, anj^ulato-lunaris ; perist. simplex, rectuDi, acutum. 



" Diam. maj. 5i, min. 5, alt. 2| mill.'' (Pfeiffer.) 



Bab. Ceylon : ~Kandy, Balapiti, Badiilla* {Blanforcl, Layard, 

 NevilT) ; Ambagamuwa (Collett) ; Balcadua {Simo7i)l 



When first described by Pfeiffer the habitat was unknown. 



Benson, in IS.IS, described what he thought, was a new species 

 under the name of BcHx jndeohis, from Balcadua, Ceylon. Pfeiffer 

 recorded this name as a synonym of his species (Moii. Helic. Viv. 

 iv, JS59, p. 110) and Benson himself subsequently pointed out the 

 identity of the two (A. M. X. H. ser. 3, v, 1860,"p. 247). 



Ficr. 



-ButJtvenia clafhrafula. 



The parietal armature consists of a single, sliglitly oblique, 

 vertical plate, which is slightly twisted and a little notched in the 

 middle, and gives off posteriorly aliove an obliquely ascendiuo- 

 support (see fig, 7 d, which shows the shell with part of the 

 outer wail removed). The palatal armature appears to be some- 

 what variable, and consists of various denticles, arranged 

 principally in two horizontal series, midway between the periphery 

 and the umbilicus. In the specimen fio;ured, which is in 

 Mr. Ponsonby's collection, the first series consists of : posteriorly, 

 a short, strong, flattened vertical tooth, and anteriorly, two short, 

 slight, horizontal denticles, separated by a short space : the second 

 series consists of : posteriorly, a short, flattened, vertical tooth, a 

 little smaller than the one above it, and, anteriorly, a short, 

 obhque, curved denticle. Below these two series is a longer, but 

 thin, horizontal fold, coincident with the umbilical angulation, 

 while above the vertical tooth of the first series is a minute, 

 horizontal denticle, coincident with the peripheral keel. The 

 specimen measures 5 millimetres in diameter. (Fig. 7 a shows 

 both armatures from the posterior side, the anterior palatal 

 denticles being hidden by the posterior teeth ; fig. 7 6 pives the 

 anterior view of both armatures, but the posterior tooth of the 

 first series is here hidden by the parietal plate ; fig. 7 c shows 



