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. Cyathopoma, W. Blanf. 



Testa umbilicata, turbinata v. turbinato-depressa, epidermide 

 crassa, saepe 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 Urate. 

 C. filocinctum, Bens. 

 C. Kab-yenense, H. Blanf. 

 C , n. sp. (undescribed). Western Ghats near Bombay. 



2. Smooth. 

 C. Malabaricum, W. Blanf. Nilgiri Hills. 

 C. Kolamullieme, W. Blanf. Kolamully Hills. 



8. Pterocyclos, 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. I 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 



