1829.] 
Analysis of Dolomite. 
265 
Fam. Lcs Peristomiens—Cam. 
4, Paludina. 
A. P. vivipara. Most rivers and jheels. 
B. River Gumti, (exuviae) . 
C. Jheels in the Doab and Bundelkhand. 
4. Jheels in the Doab, near Hamirpdr. 
5. Ampullaria. 
A. Tanks and jheels, Allahabad, Mirzapfir, and Juanpur, 
B. Jheels Bundelkhand, Juanpdr, Mirzapfir, &c. 
BtVALVES. 
Concha; Fluviatiles . 
1. Cvclas, a minute species brought down by the Jumna in the rains. 
2> Cyrena. 
A. Ganges, Jumna, Gumti, Betwa, and Cfn. Found alive in the latter. 
B. Alive in the C('n and Betwa. 
C. Jumna. 
D. Jumna and Betwa. 
Fam. Arcacece. 
3. Arca. Of this genus of which no fresh-water species is, X believe, certainly known* 
I have a small species which X discovered at Hamirpur in the Jumna- 
It is extremely rare. I possess a perfect specimen, and a single valve of 
a larger one. Sowerby conjectures that A. senilis may be a fresh-water 
species, and Schroter’ mentions a species A. fluviatilis as inhabiting 
southern India. The distance of Hamirpiir from the sea (1000 miles) 
sets its fresh-water origin beyond a doubt. My specimens were brought 
down with other small shells by the stream of the Jumna in the rains. 
Fam. Naiada. 
4. Unio. 
A. Gumti, alive, Gogra, and U r in Bundelkhand. 
B. Ganges, Jumna, Betwa, and Cin, alive. 
C. Alive in the Ganges, Betwa, Jumna, Cdn, and Gumti. 
D. Alive in the Jumna. 
5. Anodonta. 
A. Minute, in a tank at Hamirpfir, Bundelkhand. 
B? Alive in the Jumna. Exuviie common in the Gumti, not frequent m the 
Ganges. The animal of this shell appears to differ much in structure as well as 
habits from the rest of the Naiadse. In its habits I am led to believe that it re- 
sembles the Solenaceae, to which family, in the disproportionate breadth of the 
shell, it bears some analogy; but the hinge differs widely from these shells, its 
widely gaping extremities indicate a great difference in habit from the Naiadae. 1 
am inclined to think that it will form a new genus. Unlike the Naiad® its mte- 
I°do 1S not think that nfany more species or genera will be found m the places 
which I have marked as the habitats of the species in the preceding list. The 
streams which flow into the Ganges from the N. E., the rivers of Aracan, the Nerbudda 
and the Satlej mav, however, be expected to afford an addition to oui list, when 
those who have opportunities of visiting them shall take an mterest^in ^natural 
history. ' " " 
V.—On the Analysis of Dolomite. 
InNo. 3. of the Gleanings, notice was taken of a method, mentioned in the course of my 
experiments on limestones, of determining the presence of “agnema by its incapability 
Of forming a hydrate along with the lime when the stone is slaked after calcination. 
I find tii at the following" experiments were subsequently made in prosecution of 
this inquiry ; and should 'they be deemed to possess any interest, I shall be gratified 
by their being inserted in an early number. . . . . 
To ascertain the extern, of accuracy to which the dry analysis of the compound 
carbonates of magnesia and lime might be carried, I made artificial admixtures of 
rhombohedral calcareous spar and carbonate of magnesia in different proportions, 
and submitted them first to calcination under a muffle, and afterwards to the opera- 
tion of slaking. 
