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 Cautraiue, 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 €\\!a&x albida or peloritana 

 have the beaded nepiouic 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 

 TVatson. It is, however, a fact, and probably accounts for the confusion in the 

 literature, that L. albida Dall occurs in the Italian Pliocene with L. peloritana, 

 and was sent to Jeffreys by Segueuza 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 14.62 (all varieties) 



L. induta 6.75 6.25 (one specimen) 



L. albida 7.00 7.50 (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 Dall, 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 uepionic whorls reticulate, flattened; the later whorls keeled bluntly 

 at the shoulder, behind which they are flattened; ou the flat area are two strong, 

 elevated, spiral threads (which later disappear) close together, with the channels 

 on either side reticulated by subcqual 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 bt a projection of the pillar lip ; the verge of the umbilicus is rounded 



