CONCHOLOGICAL WRITINGS. 93 
1. Siphalomphix, Raf. N. G. shell conical, opening oval acute, 
end rounded, columella twisted with atubular ombilic. It differs 
from Agathina by the columella and ombilic. 
S. bonariensis Raf. or Ag. bonariensis, Raf. Six spires tip 
nearly obtuse, first spire with a transversal angle—shell about one 
inch long, whitish semi-transparent, brittle. 
2. Stegomphizx, Raf. N. G. shell oval opening nearly round lips 
not quite joined, the internal covering a small spiral ombilic.—There- 
fore different from Cyclostoma and Paludina. 
St. elegans, Raf. (or Cyclostoma) oval with 5 spires, white, end 
nearly obtuse yellow, spires with many small prominent transversal 
strias.—One inch long or less very pretty. 
3. Diplicaria. Shell oval, opening oval, columella broadly 
plaited with 2 folds or thick oblique ribs.—Near Voluta and Torti- 
cella, but not marine. 
D. bonariensis, Raf. Oval obtuse smooth olive color with 2 
spires only—small shell of half inch. 
On five New Fresh Water Shells, of Bengal and Assam in 
Asia. 
They have been collected by Dr. Burroughs and are in my 
cabinet. 
1. Planorbis albescens, Raf. nearly smooth whitish flattened on 
the right side with 3 raised spires, only 2 on the left in a hollow, 
opening hardly oblique. Size above half an inch. 
2. Paludina vitula, Raf. oval conical acute, 5 spires, swelled 
before, olivaceous with narrow spiral brown bands.—Size about one 
inch long. 
_ 8. Paludina fragilis, Raf. oval swelled acute, 5 spires, smooth 
[166] 
brittle, of a uniform dark or pale horny color.—Smaller than the 
last. 
4. Melania tessula, Raf. oblong, brown, seven spires, somewhat 
tesselated by prominent ribs and small spiral strias, about one inch 
long, I have 3 varieties. 1. first spire with duplicate strias—2. do. 
single strias, knobby tesselate shorter. 3. do. strias nearly obliterated. 
Are they different Sp ? 
5. Melania costula, Raf. elongate, olivaceous brown, 7 or 8 
spires, all with regular angular ribs lengthway, the first spire with 
a spiral angle ending at end of opening. Over 1] inch, from the 
river Ganges. 
