42 CATALOGUE OF SHELLS. 
other, which is slenderer and tapers more gradually. The ordinary 
length of this species is not more than an inch. 
M Lirata is a very variable species and seems to thrive best near 
the influence of brackish water. The largest variety occurs near 
Calcutta, but I have no specimens. The ordinary variety rarely attains 
1} and is then rather eroded. The smaller are but little eroded, 
and vary form {~ to + in length, among the larger var from some loca- 
lities the whorls are more or less turrited. M. Spinulosais less commonly 
found in fine condition than the others and often closely approaches 
sone vars both of M. Tuberculata and M Lirota. The finest specimens 
Thave seen are from Ceylon. ‘This yar has the last or penultimate 
whorl ornamented with 5 or 6 conspicuous spines. When the penulti- 
mate whorl is so armed the last whorl is smooth the animal resting 
satisfied with forming a single row of long spines. Length 1 inch if 
perfect but apex a little eroded. ‘The continental specimens are usually 
smaller, 
7, M. Nodosa. KE. L. Layard. 
Ceylon. 
(var of tuberculata (?) ) 
8. M. Spiralis. EB, L. Layard. 
Ceylon. 
9. M, Canaliculata, Sec, Cab. 
Indiana. 
10. M, Sp. Dr. Tonnere. 
Navigator's Islands. 
a1: | Msp. . Dr. Tonnere. 
Navigator's Island. 
A stouter species than the last, though closely allied to it. 
12. M. Amarula. (sp). Mr. Lietard. 
Mauritius. 
