ft HWO in i 



erntrir growth-mark-. Tail valve hall'eimilar. || 

 -eulptiired likr the head valve; it- mitral area from 



than .' die length .f die posterior slope. I'mbo aeut- 

 examples. 



The insertion plates are nil overhung ly the eaves, th< Ia1 

 jectiDg beyond them. Tin- ;uit< -rii.r valve has 17, posterior valve 

 \'2 teeth. 



The ground color of the shell baa a light reddish-white or hril- 

 liant red tone, with more or less distinct radiating flamed <tn-ak8 of 

 li-'hter and darker; girdle yello\visli-l>ro\vii, lighter toward the 

 edge, with i'cw or numerous transverse tracts of lighter. / 



L.-ngth 2b", breadth 14 mill. 



South 



steinenii PFFR., ^Foll. von Siid-Georgien, in .Juhrb. 

 Hand). Wiss. Anstaltcn, iii, p. 103, t. 3, f. 1, 1886. 



Closely allied to T. puniceus, but different in having the central 

 and lateral areas equally granulated, and the central area entirely 

 without longitudinal sculpture. 



Section Trachyradsia Carpenter. 



Trachyradsia CPR., MS. DALL, Proc. U. S. Nat. Mus., Jan., 

 1878, p. \, 323. Type, C/i. fulgelrum Keeve. 



Chitons like Trachydermon except that the insertion plates of the 

 median valves have two or several slits. 



The species of this group should be carefully compared with 

 CalMntnn. and Stereochiton, with which groups they agree in the 

 multiple slits of the central valves and the markedly spongy ea 



I am not disposed to group these forms with Trathydermon but 

 leave them here in deference to the views of Carpenter. It should 

 be noted that Carpenter did not consider Ch. fulgetrutn the tvpe of 

 his group, that species having been selected by Dull. 



I. PULQETBUM Reeve. PL 8, figs. 80, 81, 82. 



Shell ovate, a little attenuated in front, very minutely and doe 

 decussately punctured under the lens, throughout. Terminal 

 valves and lateral areas of the rest somewhat ohscmvly radiatrly 

 grooved. Reddish-brown, peculiarly painted with longitudinal yel- 

 low and black zigzag waves. Girdle horny, (five.) 



H'thltat tail;/ 



