105 
Colour reddish-buff, mottled on dorsal areas, turning to deep- 
red on some of the lateral areas, a few minute irregular 
black and white spots. Second valve larger than any of the 
following five. The forward part of the lateral areas and 
tthe posterior and anterior valves bear radiating rows of eye- 
‘dots. 
Anterior Valve. About 15 or more fine strie radiating 
from 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 strie. 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 asin 
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. Weathery, 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 
