442 Mr. W. T. Blanford on the Classification of 



and duplex operculum, horny internally and testaceous exter- 

 nally, with a raised, shelly, lamellar edge to the whorls, the only 

 essential distinction being in the degree of development of that 

 lamellar edge. These two species were both classed with Cyclotus; 

 yet, as I shall have occasion to show, they really belong to dis- 

 tinct families. 



Dr. PfeiflFer's classification is the following, the Eastern genera 

 alone being enumerated : — 



Order PNEUMONOPOMA. 



Suborder Opisthophthalma. 



Family I. Aciculidae. (Truncatella.) 



Earn. II. DiplommatinidsB. (Diplommatina, "iPaxillus.) 



Suborder Ectophthalma. 



Family I. CyclostomidaB. 



Subfamily 1. Cyclotin^. {Qy c[oi\x%, Opisthoporus,V ievocydos, 



Alycseus.) 

 Subfam. 2. Cyclophorin^. (Auloporaa, Cyclophorus, Lepto- 



poma, Dermatocera.) 



Subfam. 3. Pupinin^. (Megalomastoma, Cataulus, Raphaulus, 



Streptaulus, Pupinella, Pupina, Registoma, Callia.) 



Subfam. 4. Licinin^. {No Asiatic representatives.) 



Subfam. 5. CYCLOSTOMiNiE. (Otopoma, Cyclostomus*.) 



Subfam. 6. Cistulin^. [No Asiatic representatives.) 



Subfam. 7. PoMATiAsiNiE. (Pomatias.) 



Subfam. 8. Realin^. (Hydrocena.) 



Family II, Helicinidsef. (Helicina.) 



Of the above genera, those in italics are not known to occur 

 within the area to which the following remarks especially apply. 

 This area comprises Hindustan, with the Himalayas, Ceylon, 

 Assam, and the Burmese provinces, both British and indepen- 

 dent. 



The additional genera to which I shall refer are Opisthostoma^ 

 H.Blanf., /SperacM/wm, Pearson, i?Aios/owa, Bens., C/ys^jaAz's, Bens., 

 Hyhocystis, Bens., Cyathopoma, W. Blanf., Jerdonia, W. Blanf., 

 and one or two new generic or subgeneric groups. 



The principal amendments which I shall propose are in the 



* C. trochlea, Bens., was assigned to this genus by Dr. Pfeiffer, but in 

 error. The restricted genus Cyclostoma or Cyclostomus is really without 

 Asiatic representatives. 



t Dr. Pfeiffer's terminations for the names of families and subfamihes 

 are rather different. I have preferred using those commonly employed in 

 English works. 



