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. Pfeiffer’s classification is the following, the Hastern genera 
alone being enumerated :— 
Order PNEUMONOPOMA. 
Suborder Opisthophthalma. 
Family I. Aciculide. (Truncatella.) 
Fam. II. Diplommatinide. (Diplommatina, ?Pazillus.) 
Suborder Ectophthalma. 
Family I. Cyclostomide. 
Subfamily 1. Cycirotin. (Cyclotus, Opisthoporus, Pterocyclos, 
Alyczeus.) 
Subfam. 2. CycLtopHorin#. (Aulopoma, Cyclophorus, Lepto- 
poma, Dermatocera.) 
Subfam. 3. Purrntnz. (Megalomastoma, Cataulus, Raphaulus, 
Streptaulus, Pupinella, Pupina, Registoma, Callia.) 
Subfam. 4. Lictntnm. (No Asiatic representatives.) | 
Subfam. 5. Cyctostominz. (Otopoma, Cyclostomus*.) 
Subfam. 6. Crsrutinm. (No Asiatic representatives.) 
Subfam. 7. Pomatiastnw. (Pomatias.) 
Subfam. 8. Reatinaw. (Hydrocena.) 
Family II. Helicinide+. (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 imdepen- 
dent. 
The additional genera to which I shall refer are Opisthostoma, 
H.Blanf., Spiraculum, Pearson, Rhiostoma, Bens., Clostophis, Bens., 
Hybocystis, Bens., Cy yathopoma, W:; Blanf,, Jerdonia, W W. Bianf., | 
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. 
+ Dr. Pfeiffer’s terminations for the names of families and subfamilies ;. 
are rather different. I have preferred using those commonly employed in 
English works. "] 
