20 HEMIARTH1MM. 



II. BBTULOSUH Carpenter. PL 5, figs. 89-100; 1-8. 



The color of the shell is a uniform warm dark brown, and the 

 girdle is chestnut brown, with a pale crenulated border round the 

 margin of tin- valves. In each of the dark triangular bays between 

 tin- valve- i- a .-mail tuft of short white spicular scales, and there are 

 imilar tufts round the anterior border of the first valve. The 

 anterior and po>trrior valves and the lateral areas of the inter- 

 mediate valves are marked by concentric lines of growth, otherwise 

 the latter are scarcely discernible. The jugum is very gently 

 rounded, so that the pleura are slightly depressed. The unslit in- 

 sertion plate of the anterior and posterior valves is shown in figs. 

 90, 94, and 4. ~>, (\. The girdle (fig. 98) is thick and soft, with a 

 minute scattered scales. There is a distinct fringe of reddish 

 brown elongated striated scales round the margin. The scales 

 forming the tufts are stout, and white in color. Carpenter describes 

 the anterior tufts as about four in number; in my specimen there 

 are -i\ anterior tufts. Evidently Carpenter was not quite satisfied 

 on this point, as in all other Chitons which possess tufts, only four 

 are p resent; and, consequently, that number might be expected to 

 occur in this species also. The head lappets are rather large, and 

 the anus is on a large rounded papilla. The longitudinal band on 

 the under side of the girdle (veil of Carpenter) is produced into flaps 

 at the po.-terior extremity. 



Tin- L r ill> rjil. .">, figs. 1, 99, 100, 7), form a short posterior row, 

 and appear to be about six in number; they decrease in size anttr- 

 iorly. 



Length '.) mm. ; breadth 4 mm. ; side of valves meet at an angle 

 of about 115. (Haddon.) 



Length i: 1 ,, width 7 mill. (Q?r.) 



Kerguelen Island, on stones at low water (Kidder); and Royal 

 Sound on shore (' Challenger ') ; South Georgia (Pffr). 



Hemi'irthrum setn/nsnm CARPENTER 1/&, p. 13. DALL, Bull. U. 



it. Mus. ii, l>7'i. p. 44. HADDON,' Challenger 'Poly placophora, 

 p. 11. t. 1. f. 1 : t. L'. i'. 4a-l. MAI.-TKNS and PFKI -FKK, Jahrb. der 

 llambnrgischen Wissenschaftlichen Austalten iii, p. ]08, t. .'), f. 4, 

 1886, 



The specimens from S. Georgia were much eroded ; they meas- 

 : about s -ll mill., and were when alive, ''brown-black almost 

 blaek. " One of these is figured on pi. 5, figs. 1, 2, 3. 



