397 
ACANTHOCHITON MAXILLARIS, N. 6p. 
Pl. xli., fige. 5 and 6; pl. xlii., fig. 1. 1": 
General appearance.—Shell long, rather flat, sides slightly 
rounded, dorsal area much rounded, width of shell less than 
of the shell mottled in with the pink. The milk-white or 
porcelain-white pustules contrast strikingly with the general 
ground-colour of the shell. 
Anterior valve.—This valve is too broken to disarticulate, 
is clothed with white pustules smaller towards the apex, an 
larger and more rounded towards the girdle; there are evi- 
dences of ray ribs, probably five, this feature being so common 
to Acanthochitons ; 
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a row of milk-white pustules, fully three times the size of the 
upper row, and more or less placed alternately, short and long, 
looking like a row of irregular, rounded teeth set in a Jaw, 
