
103 
I have been indebted for the opportunity of exploring Wes- 
tern Australian Polyplacophora. : aA ' 
“ Keficoenelct ys Fr tee Lelio 
27, PexxfrHoRaHEDLEYI, sp. nov. L 
Plate xxiv., figs. 2a,b,c,d,c.f. / EF 
General Appearance. Shell ovate, narrowing toward the 
anterior, side slopes curved. Colour pale-green with five black 
and white zebra stripes in the pleural area. The articula- 
mentum is a milky-white with dark splashes at the sutures. 
Anterior Valve. Radially ribbed with eight rounded 
coste dying off toward the apex. These correspond with the 
eight slit rays in the interior of this valve. 
Posterior Valve. Insertion plate smooth, unslit, like all 
plaxiphora. Sinus broad and rounded. Insertion plates 
large. Colour, milky-white, splashed with brown and black 
stripes. 
Median Valve. Dorsal area beaked, forming an equi- 
- lateral triangle, with a central ridge almost smooth and 
Splashed longitudinally on its posterior Margin, with 
black-and-white stripes varying in different valves. In 
one valve microscopic striz run out diagonally from the 
central area. To the unaided eye the dorsal area is pale-green, 
smooth, and horny. The division between the dorsal and 
pleural areas is distinctly marked by five white and five 
black zebra bands, small toward the apex and lengthening 
toward the girdle. The pleural and lateral areas seem to 
Tun into one another, a slightly raised radial rib marking the 
division. The pleural and lateral areas have a mottled 
appearance, with splashes of brown and white or black and 
white. The internal part is a milky-white with a distinctly- 
raised rib, broad at the apex and narrowing off to one tiny 
slit. The sinus is broad and the sutural plates neatly 
curved. 
Girdle. Weathery with microscopic granulations. Nar- 
Tow with sutural horny protuberances, some spikes remaining, 
‘Colour alternately black and white, black at the valves and 
white at the sutures, 11 or 12 stripes of each colour on each 
Side. 
Measurement. ried specimen. Length, 16 mm. ; 
breadth, 11 mm. 
Habitat. Rabbit Island, Albany. Two live specimens 
and one median valve. 
Remarks. This specimen has been named after Mr. 
Hedley, conchologist, whose wide conchological information 
has helped many a beginner. The zebra-like stripes will 
“ause this specimen to be easily distinguished. 
