164 



Chitonellus striatum of Lamarck describes our South Aus- 

 tralian species admirably. Most of the specimens are covered 

 with soft velvet seal-like hair, which hardens into bristles 

 when dried. I have a few hairless specimens, but this may 

 be accounted for by local attrition or disease. The breadth 

 of the valves varies so much in striatus that there seems no 

 room for var. gunnii. 



C. striatus is found all around the coast of Australia and 

 Tasmania. I have collected it in about twenty places on the 

 South Australian coast from Port MacDonnell to Nuyt 

 Archipelago. The valves in some specimens are of a rich 

 deep salmon-pink, while others are a dark-brown. The girdle 

 is of a nut-brown when alive, going darker as it dries. It 

 delights in the recesses of bunches of Serpularia, and I have 

 taken macerated specimens from the stomach of a schnapper. 

 I have seen living specimens nearly a foot long. I have dried 

 ones 90 x 10 mm. 



55. Callochiton rnayi, Torr, 1912. PI. v., figs. la-f. 



C. mayi, Torr, Proa, Roy. Soc. Ta smania, 1912, p. 1. 



General Appearance. — Shell oblong, very much elevated, 

 strongly carinated, side slopes straight. Colour. — Creamy- 

 white variegated with splashes of reddish-brown ; the 

 anterior and posterior valves are nearly always red, and this 

 colour extends to the girdle. 



Anterior Valve. — Red, smooth to the unaided eye, but 

 microscopically regularly granulated and dotted all over with 

 minute black dots which look like eyes, 14 to 16 pectinated 

 teeth. 



Median Valve. — Lateral area distinctly raised, smooth or 

 with slight growth-lines. A broad shallow transverse sulcus 

 in the centre of the area containing numbers of eye-dots 

 somewhat regularly arranged. On one lateral area on one 

 side of a valve 61 of these eye-dots were counted. 



Pleural area deeply longitudinally sulcated with eight to 

 twelve grooves, extending from the margin to the dorsal area, 

 but growing shorter towards that area. 



Dorsal area triangular, with microscopical irregular 

 striations running into the pleural area. 



The median valves have two distinct slits. 



Posterior Valve. — Divided into two distinct areas by a 

 raised riblet, the posterior part being similar in colour and 

 granulations to the anterior valve, and the upper part creamy- 

 white with splashes of red, microscopically granulated, 

 numerous eye-dots, mucro median. The division between 

 the two parts of this valve is very distinct. The pleural area 

 has the same longitudinal sulci as that of the median valve. 



