NO. 2223. CHITONS FROM THE NORTHWEST PACIFIC— BERRY. 3 



Color (in alcohol) a light yellowish brown without mottlings, 

 Interior of valves white. 



The ctenidia are posterior in position and number about 12 on 

 each side. 



Maximum length of type, 15 mm.; width, 8 mm. 



Type.— Csit. No. 215625, U.S.N.M. [S. S. B. 95]. 



Type-locality. — Station 4967, 244-253 fathoms, brown mud, etc., 

 bottom temperature 45.9° F., off Shio Misaki Light, Japan. 



Remarks. — This little species is fairly large for a Lepidopleurus, but 

 offers no particularly striking characters. The three recognizable 

 Japanese members of the genus, L. Jialcodatensis Thiele, L. japonica 

 Thiele, and L. assimilis Thiele, are all from much shallower water and 

 differ entirely in the possession of broad, striated girdle scales little 

 resembhng the smooth, narrow spinelets of the present form. The 

 radula of the latter is also distinctive, possibly showing most resem- 

 blance to that of L. Jialcodatensis as figured by Thiele. 



Family CALLOCHITONIDAE. 



Genus TONICELLA Carpenter, 1873. 



TONICELLA SUBMARMOREA (Middendorff, 1846). 



1846. Chiton su6?narworeMS Middendorff, Bull. Phys.-Math., Acad. Sci. Peters- 

 burg, vol. 6, No. 8. 



1848. Chiton submarmoreus Mtddendorff, Mem. Acad. Sci. St. Petersburg, vol. 

 6, p. 98. 



1886. ToniceUa submarmorea Dall, Proc. U. S. Nat. Mus., vol. 9, p. 210. 



1892. ToniceUa submarmorea Pilsbry, Man. Conch. (1), vol. 14, p. 42, pi. 10, 

 figs. 16-24. 



Three specimens were ta.ken between tides at Nikolski, Bering 

 Island, June 15, 1906 [S. S. B. 116]. Two of these are entered as Cat. 

 No. 215626, U.S.N.M. 



The species has already been recorded from Bering Island by Dall. 



Genus SCHIZOPLAX Dall 1879. 



SCHIZOPLAX BRANDTII (Middendorff, 1847). 



1848. Chiton Brandtii Middendorff, Mem. Acad. Sci. St. Petersburg, vol. 6, p. 128. 



1848. Chiton Brandtii Middendorff, Bull. Phys.-Math., Acad. Sci. St. Peters- 

 burg, vol. 6, No. 8, pp. 117-118. 



1879. Schizoplax Brandtii Dall, Proc. U. S. Nat. Mus., vol. 1, pp. 2, 296, 328, pi. 

 1, fig. 8 (dentition). 



1884. Schizoplax brandtii Dall, Proc. U. S. Nat. Mus., vol. 7, p. 344. 



1892. Schizoplax brandtii Pilsbry, Man. Conch. (1), vol. 14, p. 47, pi. 11, figs. 

 32-37. 



One specimen taken between tides at Nikolski, Bering Island, June 

 15, 1906[S. S. B. 117]. 

 The species has already been listed from Bering Island by Dall. 



