90 THE NAUTILUS. 
38. Carychium exile H.C. Lea. D, C. 
The aquatic species will be enumerated in a second paper. 
DESCRIPTION OF A NEW AUSTRALIAN CHITON. 
BY H. A. PILSBRY. 
Chiton Bednalli n. sp. 
Oblong, strongly elevated, with acute dorsal keel and straight side- 
slopes. Cream-white, with a small flesh-pink spot at each beak, and 
a sparce mottling of same on lateral areas, the central areas clouded 
with green. Girdle flesh-tinted with green bars. 
Median valves acutely beaked, the beaks hardly projecting on 
the straight or concave posterior margins of valves, which, at the 
sides, are regularly serrated. Central areas with a narrow, smooth 
band along the ridge (wider and triangular in valve ii), the pleura 
with 12 narrow, strong, rounded, longitudinal ribs on each side, 
separated by flat grooves wider than the ribs; inner one or two riba 
not reaching to anterior margin of valve. Lateral areas well raised, 
divided by a median groove (doubled on some valves), which widens 
at intervals, forming a series of triangular pits; traces of somewhat 
similar pits appear along the diagonal slope, and the posterior border 
has a series of transverse undulations corresponding to the denticles 
of the sutural margin. Valve i with about 20 radial narrow grooves, 
also pitted; and, like the grooves of lateral areas, these do not extend 
to the beak, which is surrounded by a smooth area. Valve viii with 
central projecting mucro, the slope behind it very concave; anterior 
area ribbed, posterior area with pitted radial grooves. 
Interior white, blue on the valve-callus. Girdle clothed with 
convex imbricating scales, rounded in contour, and measuring about 
two-fifths of a millimeter in width, faintly striated toward inner 
edge of girdle, blunter and smoother toward outer edge. 
Length 25, breadth 11 mm.; angle of divergence 98°. 
Yorke’s Peninsula (W. T. Bednall). 
This species resembles C. Covi somewhat, but differs in the pecu- 
liar pit sculpture of the lateral areas. Its nearest ally is a still un- 
described South Australian species collected by Mr. Bednall. The 
coloration described will probably be found subject to variation, as 
usual. 
