344 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
That the carinatus Cantraine is merely one of the numerous mutations of 
peloritanus (or vice versa) is not only shown by the measurements and figures 
given by Cantraine, but is generally admitted by naturalists familiar with the 
species. 
I have not seen the unique specimen of Leptothyra induta Watson, figured in 
the “ Challenger ” report, but none of the specimens of either albida or peloritana 
have the beaded nepionie sculpture or the puckered folds in front of the suture 
shown in the figure of induta. The measurements, moreover, show that induta 
cannot be conspecific with peloritana in any of its mutations. I am inclined 
to believe that induta is a good species and distinct from albida, which does 
not show in any of its mutations the characteristics described and figured by 
Watson. It is, however, a fact, and probably accounts for the confusion in the 
literature, that Z. albida Dall occurs in the Italian Pliocene with Z. peloritana, 
and was sent to Jeffreys by Seguenza as a possible variety of peloritana, These 
specimens are now in the National Museum, and, with the series I have spoken 
of for comparison, are indubitably distinct from the others. 
'The average measurements of the three forms referred to are as follows, in 
millimeters : 
Species, Height. Max. breadth. 
L. peloritana 14.00 14.02 (all varieties) 
L. induta 6.75 6.25 (one specimen) 
L. albida 7.00 7.60 (27 specimens) 
The recent peloritana seem to tend to less height, greater width, and larger 
size than the fossils. In albida there is no great variation in sculpture, unlike 
peloritana, 
Liotiidae. 
LIOTIA Gray, 
Liotia (Arene) californica Darr, n. sp. 
Shell large for the genus, rude, yellowish-white, depressed, with about six 
whorls, carrying at the shoulder six blunt, large, projecting tubercles; nucleus 
small, the nepionic whorls reticulate, flattened; the later whorls keeled bluntly 
at the shoulder, behind which they are flattened; on the flat area are two strong, 
elevated, spiral threads (which later disappear) close together, with the channels 
on either side reticulated by subequal and subequally spaced radial threads; on 
the last whorl all the sculpture on the upper part of the whorl, except the keel 
connecting the tubercles at the shoulder, has disappeared ; the surface of the shell 
is of a spongy nature and all the sculpture is obscure as if deliquescent ; the base 
is rounded with a large spiral, deep umbilicus, having one entering spiral keel 
which ends at a projection of the pillar lip; the verge of the umbilicus is rounded 
