LEPTON. 81 
and the superabundant filamentous matter is similarly dis- 
charged. 
The L. sguamosum is a lively creature, but this, not one- 
third of the size, is far more active, creeping up a glass as 
easily as a Gasteropod; but the posterior portion of the foot 
is not expanded; perhaps in freedom it is deployed on the 
march ; in confinement both shell and foot are carried laterally. 
The liver is light green, united to a flake-white ovarium, now, 
in June, full of ova. Transverse length $, vertical =, dia- 
meter j; of an inch. It would appear that this species m 
every essential is identical with the L. sguamosum, and it 
settles the position of the yet undiscovered L. converum. This 
is the first record of this rare animal that has appeared. 
Exmouth, June 20, 1852. 
I have this day the pleasure to state, that the problem is 
solved as to the identity or distinctness of the Lepton nitidum 
and L. convewum by the capture of a live specimen of the 
latter, having the shell sculptured with the rough and intensely 
marked characteristic punctures of that species. On putting 
the animal into water it instantly deployed its organs ; and for 
their description I have only to refer to the preceding account 
of the L. nitidum, which in future will take the appellation of 
a variety of its old associate. The two are so identical, that 
after ten days’ examination I can make no alteration in the 
minutes, except the having seen the animal march on the disk 
of the foot, more than once, with the shell im a vertical posi- 
tion; it has all the same habitudes as the L. sguamosum, and 
of course differs in no respect from its smoother variety, the 
late L. nitidum. It is now alive, and probably by changing 
the water daily it will live as long or longer than the L. squa- 
mosum mentioned above. It is therefore evident that the 
punctures of this species are very variable, ranging from the 
most minute granules that scarcely interrupt its smoothness to 
the coarsest sculpture. 
As the specific appellation of xtidum is obviously improper, 
the more significant one of converum ought now to be adopted. 
Since the above was written I have taken two examples, one 
this morning (July 18), of the smoothest variety of the ‘ con- 
G 
