105 



'dolour reddish-buff, mottled on dorsal areas, turning to deep- 

 red on some of the lateral areas, a few minute irregular 

 olack and white spots. Second valve larger than any of the 

 following five. The forward part of the lateral areas and 

 the posterior and anterior valves bear radiating rows of eye- 

 dots. 



Anterior Valve. About 15 or more fine striae radiating 

 irom the apex with a slightly raised rib between each pair. 

 These rays are really the eye-dot lines. I counted 15 eyes in 

 one ray. There seems to be on either side a sort of flesh- 

 coloured lateral area. The rest of this valve is a pale-pink, 

 mottled with cream. Dentition : Eight slits are distinctly 

 visible, but as I have only one specimen I have not dissected 

 it. The insertion teeth are pectinated. 



Posterior Valve. Large, mucro median rectangularly 

 elevated. The dorsal area is smooth, beaked with irregular 

 lateral striae. The eye-dots radiate from the mucro to the 

 insertion plate. Colour dorsal and posterior area pink, 

 mottled with cream, and on each side corresponding to the 

 lateral area which is of a rich red colour. The insertion plates 

 are pectinated with probably a dozen slits. 



Median Valves. Dorsal area is V-shaped, curved, and 

 beaked, colour pinky-buff, mottled with cream. Pleural area 

 small, flesh- or buff-coloured, depressed with concentric 

 growth lines running from lateral into pleural and dorsal 

 areas. Lateral areas, some flesh-coloured, others mottled as in 

 the dorsal areas, five or six irregular flattened ribs. Eye- dots 

 irregular on the anterior half of each valve. Insertion plates, 

 -one slit, pectinated. The sutural plates are diminutive, 

 sinus shallow and pectinated, and the interior is porcelain- 

 white. 



Girdle. Leathery, nude. Breadth in dry state, 2 mm. 

 Colour light-brown. 



Measurement. Dried specimen. Length, 30 mm. ; 

 breadth, 20 mm. Divergence, 125°. 



Habitat. Rockpool, Ellenbrook, south of Cape Natu- 

 raliste. One live specimen and one median valve. 



Remarks. The Genus Tonicia is somewhat rare in Aus- 

 tralian waters. I have named this very handsome species 

 after Mr. A. F. Basset Hull, whom Mr. Iredale describes as 

 "the most enthusiastic chiton student in Australasia." 



30. Lepidopleurus niger, sp. nov. 



Plate xxv., figs. 5a,b,c,d,e,f. 



General Appearance. Shell small, broad in proportion 



to length. Valves rounded and raised. Regular granulose 



striations are microscopically conspicuous. Colour dark 



