
1865. Contributions to Indian Malacoloqy: 93 
gy 
in form to the Cambodia H. repanda, Pir., and may perhaps be 
identical. 
It will be seen how variable the forms are. The spire varies from 
flat to almost bell-shaped, the periphery from sharply keeled to angu- 
late, the whorls from subconvex to flat or nearly so; nor is there great- 
er constancy in the form of the mouth, the sculpture, the epidermis, 
or the breadth of the umbilicus. Distinct as many of the varieties 
appear to be, they all pass gradually into each other, and with the 
exceptions already described, I believe all the forms are most safely 
classed as varieties of one species. Whether this should be called 
rotatoria or tapeina is difficult to say, without more precise acquaint- 
ance with the types of those shells.* 
Not far from the tapeina group must be classed H. castra, Bens., 
which, despite its thin horny shell and sharp peristome, is not a 
Nanina, but a true Helix. It occurs throughout the Arakan hills, 
wherever I have searched, but is everywhere scarce. It has the 
widest range in the Indian area of any known Helix, being found in 
the Himalayas, in Orissa, in Ceylon, and throughout Burma as far 
south as the Tenasserim provinces. 
Hf, climacterica, Bens. is very probably a Nanina, but I have not 
had an opportunity of observing the animal. The shell was found by 
Captain Ingram on the road from Prome to Tongoop, and I found it 
again in the hills, at the southern extremity of the Henzada district, 
and in Bassein. It occurred also in Long island, in the Bassein river. 
Tt is much smaller in general than the typical Khasi hill shell; I 
possess specimens, apparently fully grown, but measuring only 13 or 
14 millemetres in their major diameter. 
H. hariola, Bens. is a true Helix, and is found chiefly on trees near 
Thayet Myo and Prome. It isa rare shell. Near Ava it is replaced 
by a large sharply carinate form, which I found abundant at Thinga- 
dan, on the Irawady, about 80 miles north of Mandélé. This shell so 
closely resembles H. capitiwm, Bens., that I am much disposed to 
consider them identical, a view in which Mr. Benson, however, does 
| not agree. At Puppa hill, near Pagan, already referred to as the 
* Mr. Benson, to whom I sent specimens, considers all the forms above men- 
tioned to be varieties of rotatoria, but some, especially that from the Tsagain 
hills, appear to me to be at least as nearly allied to tuwpeina, 
13 

