I 



of the Cyclostomacea in Hindostan. 417 



from Ceylon, and it probably extends to the peninsula. Cyclo^ 

 stoma spurcum, Grateloup, alleged to have been found near 

 Bombay, is referred by Pfeiffer, with a mark of doubt, to Lepto- 

 poma/^] and the same author, on the authority of Mr. Cuming's 

 collection, assigns a small variety of the widely-spread L. viti-eum, 

 Sow., to the Nilgherries; but the name of the finder is not 

 recorded, and it has not been met with by Dr. Jerdon. Dr. 

 Cantor took it on an islet near Penang ; its occurrence on the 

 mainland lying west of the Bay of Bengal requires confirmation. 



CyclostomuSy Montf. 



Dr. Pfeiffer assigns my species C. tersum, from the Khasya 

 hills south-east of the Berhampooter, and my Nilgherry C. filo- 

 cinctumf and Trochlea (the two first with marks of doubt), to 

 this division. In the absence of opercula it is difficult to decide; 

 but 1 am inclined to dissent from his judgment in regard to 

 the two latter. It seems to me probable that C. filocinctum 

 must eventually be referred to Cyclophorus ; and C. Trochlea 

 does not well agree with the species with which it has been 

 associated. May it not be an Omphalotropis ? 



Another stray species from the southern base of the Khasya 

 hills remains, viz. Cyclostoma sarritum^ nobis, which, in the 

 absence of the operculum, cannot well be determined; it is 

 placed by Pfeiffer among the species incertce sedis. Its form is 

 suggestive of Cyclostomus. 



It will be seen, from the above enumeration, how rich in 

 Cyclostomacea the tract under consideration is already proved 

 to be. Thirty-six well-ascertained species inhabit it, and three 

 others are indicated. When the valleys of Nipal (from the 

 Ghagra to Sikkim), Bootan, the extensive jungle tract of Central 

 India, and the extreme southern point of the peninsula, shall 

 have been properly explored, we may expect interesting additions 

 to the family. Most of the species enumerated have been made 

 known only very recently, and every year adds several species to 

 the catalogue. 



Diplommatina, Bens. 



If this genus should, on further examination (not of cabinet 

 specimens, but of the animal in the shell), be proved, contrary 

 to the experience of those who have observed the species in their 

 native hills, to belong to the Cyclostomacea, three more species 



* I fiml, on reference to the Monograph, that Pfeiffer indudes it under 

 Opotoma. A consideration of the characters leads me to the conclusion 

 that its place will be found eventually in Cyclotus. 



t Vide note on this species under the heading " Cyclotus.** 

 Ann. ^Ma^.N. Hist. Ser.2. Vol.xiv 27 



