169 



Rah.— Edithburgh (Mr. Matthews). 



Remarks. — This belongs to the smooth variety of 

 Ischnochitonidce. It resembles I. wilsoni, but its surface is 

 not so granular. My one specimen is damaged. The name 

 levis is given on account of its smoothness. 



61. Acanthochites rubrostratus, sp. hoc. 



PI. vii , figs. 7a-f. 



General Appearance. — Shell elliptical, broad, girdle 

 wider than the valve. Tegmentum cream-coloured, dorsal 

 areas bright-green tipped with rosy-pink, which gives it its 

 name. 



Anterior Valve. — Three to five distinct pustulose riblets 

 with probably five slits. My dissected specimen was dam- 

 aged. In one co-type the pustulated riblet becomes one 

 elongated pustule. The tegmentum is covered with flattened 

 pustules. 



Median Valve. — The lateral area is separated from the 

 pleural area by a rib covered with pustules. The lateral and 

 pleural areas are covered with nine rows of rounded appressed 

 pustules, somewhat regular, converging towards the apex. 

 The dorsal area is narrow, corneous, showing growth-lines, 

 no striae, somewhat foliated, one slit. 



Posterior Valve. — Mucro posterior with rows of pustules 

 between it and the girdle, to which it is at right angles. 

 A dorsal area is seen which is almost smooth with irregular 

 pustules on the sides. The interior is pearly, deeply hol- 

 lowed, five slits, insertion plates large. 



Girdle.— Leathery covered with minute spinelets, having 

 long silky tufts at the sutures and five tufts around the 

 anterior valve. In a spirit specimen the girdle is as wide 

 as the valves. 



Measurement. — Dried specimen, 11 x 6 mm. 



Hab. — Two specimens from St. Francis Island and one 

 collected by Mr. Baker at Henley Beach. 



Remarks. — Somewhat resembles A. speciosus, but the 

 girdle is very much smaller and is not continued between 

 the valves. The Acantho tufts are also much more decided 

 than in speciosus. 



62. Ischnochiton bakeri, sp. nov. PI. vii., figs. 8a, b, c, f. 



General Appearance . — Shell almost round, valves narrow,. 

 flattened, colour greyish- white mottled with brown. 



Anterior Valve. — Covered with microscopic imbricating 

 pustules, closely packed, resembling girdle scales. 



