MOLLUSCA OF INDIA. Lid 
“ This little shell belongs to the genus Diplommatina, founded by 
Mr. Benson (Ann. & Mag. Nat. Hist. 1849, Sept.), on sufficient 
characters of the shell and of the animal, for Carychium costatum, 
Hutt., which I had erroneously referred to Bulémus under the name 
of B. folliculus. The genus seems to belong to the Auriculacez.” 
Size: maj. diam. 0°83, alt. axis 1:9 mm. 
On a comparison of five specimens of Diplommatina huttoni, 
collected by myself at the typical locality Mussoorie, with eighteen 
specimens from Trinidad, said to be the same, kindly lent to me by Sir 
Rawson Rawson, I do not identify them as the same species, and I 
therefore further on describe the West-Indian form as D. occidentalis. 
The former is much more closely costulated, in proportion of 20 to 10, 
that is twice as many ribs on the antepenultimate whorl; the 
general form is different, particularly the much more expanded 
penultimate whorl in the Trinidad shell when compared with the 
flatter sides of D. huttoni. Still there is undoubtedly a very close 
resemblance, particularly in colour and texture. 
The species from Trinidad was first brought to notice, identified 
as D. huttoni, in August 1867, by Mr. R. J. Lechmere Guppy, in the 
Ann. & Mag. Nat. Hist., and to the same periodical Mr. W. T. Blan- 
ford contributed a paper in February 1868 on this subject, and the 
occurrence also of Ennea bicolor in the same island. As all Mr. 
Blanford’s remarks still hold good, as to distribution &c., and as it 
is difficult to condense with justice all that the author brings for- 
ward in support of his views, I give it in extenso, for it is a point 
of great interest as regards distribution. I have now shown that 
they are not the same species, and it remains to be discovered from 
what hill-district of India the Trinidad form has been conveyed, as I 
believe it was, together with Hnnea bicolor, in the manner suggested 
by Mr. Blanford. 
“On the Occurrence of Diplommatina huttoni and Ennea bicolor 
in the West Indies. 
“In the ‘ Annals and Magazine of Natural History’ for August 
1867, Mr. R. J. Lechmere Guppy described the occurrence in 
Trinidad of Diplommatina huttoni, Pir., and suggested that its 
presence and that of Hnnea bicolor, Hutton, might be accounted for 
by supposing both to have migrated across the Tertiary Atlantis. I 
cannot help thinking that there are several circumstances opposed 
to this view; and in order to explain them it is necessary to de- 
scribe the distribution of Diplommuatina huttont and Ennea bicolor 
in India. 
““ Diplommatina huttont has hitherto only been found on the lower 
slopes of a portion of the Western Himalayas, near Mastri. It is 
true that the Himalayas have not been explored to a sufficient 
extent to justify the assertion that the shell does not exist else- 
where ; but, as not a single Western Himalayan Diplommatina has 
as yet been found in those parts of the Eastern Himalayas about 
Darjiling which have been comparatively well explored, nor, vice 
