the Cyclostomacea of Eastern Asia. 449 
which are unknown, induces me to class it with Cyathopoma. 
It is probable, however, that, as in other cases, representative 
forms of Jerdonia may hereafter be found on the other hill- 
groups of the Indian peninsula or of Ceylon. 
7. Cyatnoroma, W. Blanf. 
Testa umbilicata, turbinata v. turbinato-depressa, epidermide 
crassa, seepe hispidula induta, plerumque spiraliter lirata. Oper- 
culum truncate conoideum, concentricum, multispirum, e duabus 
laminis compositum; interna membranacea, externa testacea per- 
concava ; anfractuum marginibus externis in lamellam testaceam, 
versus medium incurvatam, interdum pulchre sculptam, elevatis. 
Animal Cyclophori. 
Type, C. filocinctum, Bens., sp. 
The forms comprised in this genus of minute shells (the 
largest known is only 3 millimetres in diameter) are all peculiar 
to the hills of the Indian peninsula. Two, belonging to distinct 
sections, have been found on the Nilgiris, one on the Kalryen- 
mully Hills, near Salem, and a fourth on the Western Ghats, 
near Bombay. A somewhat similar form has lately been found 
in the Andaman Islands by Mr. Theobald, who has kindly sent 
me a specimen. It differs, however, in several minor characters 
of the shell, and in wanting the-very peculiar operculum of 
Cyathopoma, and appears more nearly allied to a section of Cyclo- 
phorus peculiar, so far as is known, to Burma. 
The animal of Cyathopoma is white, with a short oval foot, 
undivided beneath, and has small black tentacles, with eyes at 
the base. 
The known species are the following :— 
1. Spirally lirate. 
C. filocinctum, Bens. 
C. Kalryenense, H. Blanf. 
C. , n. sp. (undescribed). Western Ghats near Bombay. 
2. Smooth. 
C. Malabaricum, W. Blanf. Nilgiri Hills. 
C. Kolamulliense, W. Blanf. Kolamully Hills. 
8. Prerocyctos, Bens. 
This is one of the best-marked types of the Cyclophoroid 
group, so far as regards its Indian (and typical) representatives ; 
but, in Burma, it passes almost imperceptibly into forms of Cy- 
clophorus. 1 have alluded in a previous paper (Ann. & Mag. 
Nat. Hist. for July 1863) to the relations of the incision in the 
inner and cowl-shaped process of the outer lip of the peristome 
