452 Mr. W.T. Blanford on the Classification o, 
13. CycLoPHoRUus, Montfort. 
Within the area to which these observations especially apply 
there exist several distinct series of forms of this well-known 
and important genus, some of them differing from the type at 
least as widely as Leptopoma does. These should be separated 
as subgenera. 
_I. Of the several groups classed under Cyclophorus, one of the 
most distinct is that for which the following appellation was, a 
few years ago, suggested by Mr. Theobald. It may be thus 
characterized :— 
Lacocuetxvs, Theobald, MS. 
Testa anguste umbilicata, turbinato-conica, parva, spiraliter lirata, 
epidermide fusca (in exemplis junioribus szepe hispidula) induta. 
Peristoma incrassatum, superne ad angulam rima transyersa bre- 
viter incisum. Operculum planum, tenue, albidum. 
Type, C. scisstmargo, Bens., from Tenasserim. 
The other species (all from Burma) are 
C. tomotrema, Bens. Khasi Hills. 
C. jie SDs eeu. 
The animal of the last species has a longitudinal groove above 
the posterior end of the foot, somewhat as in the Auriculoid 
genus Melampus. 
The shells are all about the same size as C. halophilus, Bens., 
and its allies, but easily distmguished by their thickened lip, 
greater solidity, and the peculiar sht at the angle of the upper 
margin of the peristome. To this section the little species 
found by Mr. Theobald in the Andamans, and previously re- 
ferred to, appears to belong. 
II. The next group* comprises certain discoidal shells, also 
Burmese, as a type of which C. calyz, Bens., may be selected. 
The operculum is thicker than in other Cyclophori, and has free 
and rough margins to its whorls, so as to be absolutely identical 
with that of Pterocyclos pullatus and it allies. In C. calyz, also, 
there is a slight expansion of the outer peristome at the suture 
corresponding to the wing in Péerocyclos. A similar slight | 
expansion is seen in C. phenotopicus, Bens., from the Hima- 
layas, which, however, has a thin operculum. I consider, there- 
fore, that in these forms and in the Burmese species of Ptero- 
cyclos we have that almost complete passage from one genus 
into the other, to which I have already referred, and clear evi- 
dence of their close natural affinity. There can be little doubt 
that Pterocyelos belongs to the same subfamily as Cyclophorus ; 
* For this section I proposed, in a paper printed in the ‘ Journal of the 
Asiatic Society of Bengal’ for 1863 (p. 322), the name Scabrina. Further 
study of the genus has led me to the conclusions expressed above. _ 
-— 
| 
| 
