34 



The following measurements are given from ten largest specimens from the 

 Omori Mounds, Kishiu, and Fuiiagawa. 



Average dimensions of ten largest specimens. 



Breadth. Hight. Proportion of hight 



to breadth. 

 Omori Mounds, 25.4 23. 90.5 



Kishiu, 24.G 21.8 84.3 



Funagawa, 23.2 22.1 95.2 



Lischke's largest specimen from Nagasaki measured 25 millimeters in diameter. 

 As this species varies greatty with each locality, it would he unfair to make 

 any comparisons between the Omori Mound specimens and those from Kishiu 

 and Niigata. It will be observed however, that the average diameter of the 

 Omori specimens, exceeds the largest diameter as given by Lischke, as well as 

 those from Kishiu and Niigata. 



Of the other species of mollusks found in the Mounds, no special comparisons 

 have been made, owing either to the lack of a sufficient number of mature and 

 perfect specimens, or of recent specimens with which to compare. 



The following is a list of the gasteropods thus far found in the deposits. 



Fusus inconsta ns Lischke. 

 JReipaiia bezoav Linne. 

 Semifusus tuba Gmelin. 

 Purpura Ititeostoma Chemnitz. 

 Elm ma Japan ica Lischke. 

 JFasm sp. 

 Pat a ri tides sp. 

 Lampaniq sp. 



Katiea .Lamarcläana Duelos. 

 Turbo granulahts Chneiin. 

 EoteJJa fjlobosa Gould. 

 The few specimens of Fastis inconstans appears to be more robust than the spe- 

 cies as it exists to day in the vicinity, and resembles the typical form as figured 

 by Lischke, while the recent ones along the shore resembles his small varieties. 

 Rapana bezoav is exceedingly abundant, of large size, with massive shell. 

 Many of the specimens have a portion of the body wall broken through, as if 

 for the purpose of more conveniently extracting the flesh. 



The Mound specimens of Sem i fastis tuba were large, light, and the tubercles 

 were prominent and acute. The recent specimens along the shore were about 

 half the size, q\iite solid, with the tubercles obtuse. 



The species of Nassa and Lampania were too small for edible mollusks, and 

 ■were probably accidently introduced with the larger species. Only a few speci- 

 mens of each species were collected, and these were too much eroded for com- 

 parison. 



