THE NAUTILUS. 143 



130x109x34 mm., being both considerably flatter than the speci- 

 mens described by Mr. Pilsbry. 



All my specimens are distinctly narrowed in front, and in this 

 particular the species differs essentially from P. patriarcha, which is 

 very round in outline. I have a specimen of patriarcha exactly the 

 same width as the two shells above mentioned, namely, 109 mm., 

 but its length is only 119 mm. Our species is further distinguished 

 by its sculpture from hoih patriarcha and mexicana — the ribs being 

 narrower and much more numerous than in patriarcha and decidedly 

 heavier than in mexicana. Every 5th or 6th rib in the adult shell 

 seems to be more prominent. 



Although my shells are not badly eroded there is but little color 

 observable outside, except in spots where smaller limpets have had 

 their stations. In such places the peculiar burnt red color so char- 

 acteristic of P. argenvillei is seen, and the same color, with an occa- 

 sional spot of black, edges the interior of the shell and in a paler 

 and browner shade blotches the spatula, which in the youug shells 

 is sometimes entirely brown. It would seem that the color of the 

 interior becomes lighter with age, as is the case in many other spe- 

 cies. 



The muscle scar is, as Mr. Pilsbry remarks, strongly marked and 

 callous in the adult shell, but in the youug, it is not at all noticeable. 

 This is the case also with the 2 species with which kermadecensis is 

 comj)ared. 



On the whole this is the very finest of the many fine species of lim- 

 pets that Mr. Pilsbry has made known to science during the last few 

 years. It has no rival in size save P. mexicana, except it be the at 

 present unrecognized P. gigantea of Lesson from the Society Islands, 

 which may be found to be nearly allied or perhaps identical with 

 the present shell. 



NOTICES OF NEW JAPANESE MOLLUSKS, I. 



BY H. A. PILSBRY. 



The species described below were collected by Mr. Frederick 

 Stearns of Detroit, Michigan, during his second visit to Japan, in 

 1892. They will be illustrated in his Catalogue of Japanese shells, 

 now in preparation. 



