118 
Melania nassa (Woodward), Lithoglyphus rufofilosus (Smith), 
L. zonatus (Wd.); but regretted that he had found it quite 
impossible to obtain any specimens of the curious Limno 
trochus of Smith, a recently-described genus containing 
two species, L. Thomsoni and L. Kirkii, bearing great ex- 
ternal resemblance to the Trochidse, or the Littorinoid 
genus, Risella. They are shells of greater finish and granu- 
lation than is usual in fresh water genera. 
The great extent of this lake, or rather inland sea, is no 
doubt one reason for its producing quasi-marine mollusca, and 
in a short time we shall probably be startled by more curious 
and undreamt-of forms. It will be difficult, however, to 
eclipse the Tiphobia Horei for singularity of appearance. 
There is a good plate of this species and others in the 
November number of Zoological Proceedings (1880). 
Errata. 
Page 101, line 7 from bottom, and page 102, lme 7 from top 
for “ bent” read “ beat.” 
