AUSTRALIAN POLYPLACOPHORA — HEDLEY AND HULL. 261 



Chiton vauclusensis, sj). nov. 

 (Plate lxxiv., figs. 19-23.) 



Shell rather large, oblong, strongly elevated, caiinated, side 

 slope slightly curved and steep. Colour an olive buff, flamed 

 with sepia in the pleural areas, the jugal area with sepia dots, 

 most ribs picked out with orange or chocolate. 



Anterior valve ornamented with irregular flattened pustules 

 arranged in 20-28 radiating riblets multiplied by splitting of the 

 fewer radii of the young shell. 



Posterior valve : niucro very prominent, slightly in front of 

 the centre, posterior slope concave, rayed with tubercular ribs 

 similar to the head valve, but the grains rounder and flatter. 



Median valves : lateral areas raised, carrying three to four 

 prominent tuberculate ribs, the ribs tending to divide as growth 

 proceeds. The central area furrowed by about thirty-three 

 strong, raised, longitudinal ribs, of which the central crowns the 

 valve, crowded medially and wider spaced distally, narrower 

 than their deep, square cut interstices, traversing the whole 

 jugal tract and leaving only the apex of the valve smooth. 



Girdle tessellated by alternate bands of buff and bottle-green, 

 covered with large compactly imbricating polished convex scales, 

 obsoletely striated. 



Interior pale bluish-green ; sinus deep, narrow, denticulate. 

 Anterior valve having 8, median valve 1-1, and posterior valve 

 12 slits ; teeth finely pectinate on the edge. Eaves spongy. 

 Length, 33; breadth, 20 mm. 



Station. — On the upper side of stones in 4-5 feet of water at 

 dead low tide. 



Habitat. — Bottle and Glass Point, Vaucluse, Port Jackson ; 

 two specimens. 



Affinities. — Related to Chiton limans, Sykes, but larger, more 

 elaborately sculptured, and differing in the lateral areas and 

 girdle scales. 



Chiton coxi, Pilsbry. 

 (Plate lxxiii., figs. 3-5.) 



Chiton coxi, Pilsbry, Proc. Acad. Nat. Sci. Philadelphia, 1894, 

 p. 85. 



This species has not hitherto been figured. We therefore offer 

 an illustration of a specimen 17 mm. long and 10 mm. broad 

 from the Bottle and Glass Reef, Port Jackson. The considera- 

 tion of it leads us to the next species. 



