50 THE NAUTILUS. 



In size, shape and color, our species rather resembles B. procera 

 Gld., but is somewhat more conic above, and less slender. In the 

 formation of the last whorl and the aperture it stands near B. con- 

 tracta Say, but is very different as to the formation of the angulo- 

 parietal lamella and the presence of a strong, transverse basal. It 

 is a highly remarkable and significant species, being intermediate 

 between different groups, and showing strong features of its own. 

 No other species of the geuus has the angulo-parietal lamella so 

 highly developed. 



It is somewhat variable, in the few specimens seen ; the height 

 varies from 1'9 to 2'3 millimeters, the color from pale to deep horn ; 

 the parietal lamella in one New Mexico specimen is more tortuous 

 and so large as to cover from sight the whole inferior palatal fold, 

 which is visible only from the outside, and parts of the columellar 

 and basal larnellse. 



The first three specimens seen were from the Santa Rita Mts., 

 Arizona, kindly forwarded for examination and description by the 

 U. S. National Museum, and at the request of Dr. Win. H. Dall, 

 the species was named B. ashmuni. Later, two other examples, 

 from Cook's Peak, N. M., were sent, also by the National Museum. 

 For one specimen I am indebted to Mr. T. D. A. Cockerell, who 

 collected it at Dripping Springs, Organ Mts., N. M. 



New Philadelphia, O., July, 1898. 



NOTES ON A FEW CHITONS. 



BY H. A. PILSBRY. 



JAPANESE SPECIES. 



From the crevices of some valves of Ostrcea recently sent to the 

 Academy, I obtained specimens of the following forms. 



Tonicia sp. Very young, length 6 mm.; intermediate valves 

 with 4-6 eyes in a single curved series on the forward part of each 

 lateral area. A series of short, subobsolete grooves in front of the 

 diagonal riblets. Head valve with 8 radial series of eyes. This is 

 probably a new form, but too young for characterization. It is 

 noted here because Tonicia is a genus new to the Japanese fauna. 

 Locality, Yokohama, on Ostrcea denselamellosa. 



