3:* 



Natica Lamarcki-a.net Duclos. Plate xvm. Fig. 8. 



This is another common shell in the Omori Deposits, and is also one of the 

 most common shells along the Omori shores. 



The differences between the Mound specimens and the recent ones are so 

 profound, that it may be recognized as a marked variety. The elevated spire, 

 the heavy callosity almost concealing the umbilicus, and the marked differences 

 in the proportions of the shell are noticeable at once, and distinguish it from its 

 iving representative. 



The Omori Mound variety approaches nearer the form which occurs much 

 further north at Hakodate. 



The differences between this species and Natica duplicate Say, which occurs 

 along the eastern coast of the United States, are very slight. 



Hight. Breadth. 



Average dimensions of ( Recent, 60.2 C8.4 



ten largest specimens, ( Mound, 62. 65.8 



Aasumi-g te «dth ,o be 10», hight „ j Jjj jjg »££ g« 



Dimensions of largest specimen, { J^J 



] light. Breadth. 



68. 76. 



66. 71.5 



Turbo granulosus Chemnitz. 



This is one of the most abundant shells in the Omori deposits, but the shores 

 of Omori have been repeatedly searched without bringing to light a single 

 specimen. Lischke records forty specimens from Nagasaki only. It is a 

 common species at Hongkong and further south. Prof. Yatabe and Mr. Sasaki 

 collected a very large and marked variety at the Bonin Islands, and also the 

 ordinary form from Kishiu. Mr. Takamine met with it in abundance at 

 Funagawa some distance north of Niigata, on the west Coast, and I have collect- 

 ed small specimens at Yenoshima. 



In past times it must have been one of the most common shells along the 

 shores at Omori, judging from the number that occur in the Mounds. It must 

 have had a more northern range in past times, but like Area graiwsa has retreat- 

 ed south. 



