219 



Anterior Valve. — Radially ribbed with five ribs, the whole 

 closely covered with glossy pustules on a brownish ground. 



Posterior Valve. — Mucro anterior. Pustules as in anterior 

 valve ; very small. 



Median Valves. — Lateral areas raised, closely covered with 

 slightly diagonal rows of highly polished pustules. Continued 

 through pleural areas, but considerably larger and more raised, 

 in some cases so closely packed as to suggest longitudinal riblets. 

 Some rows are confluent. 



Dorsal Area. — Triangular, broad ; uniformly covered with 

 somewhat distant, evenly distributed, slightly raised pustules, 

 arranged in some valves in longitudinal rows. Tegmentum longi- 

 tudinally striated. Ground colour of third valve deep rose-red ; 

 pustules less highly coloured. In valves 2, -1, 5, 6, 7 the dorsal 

 area is often mottled with pink. 



Girdle. — Spotted with cream and pale-brown. Very much 

 crumpled in dried specimen. Covered with irregular scales. At 

 the sutures prominent rough tubercles, from the centre of which 

 a bundle of white or brown spicules is produced. Size, dried 

 specimen : Length, 3 mm.; breadth, 1 mm. 



Habitat. — Dredged by Dr. Verco in Spencer's Gulf and 

 Investigators' Strait, South Australia, in 10 to L5 fathoms of 

 water. 



7. Aeanthoehites Tatei, n. sp. PI. 7, fig. 7. 



General Ap27earance. — Greenish-brown, spotted with pale-grey. 

 Dorsal areas bufF colour, with tinge of salmon-pink, in third valve 

 dark-green. Girdle, mossy -green. Shape, oblong carinated, side 

 slopes straight. 



Ante7'ior Valve. — Three very indistinct radial ribs closely 

 covered with slightly elliptical pale-brown scales gradually 

 decreasing in size to the apex. Ground dark-horn colour. Apex 

 smooth transversely striated. 



Posterior Valve. — Mucro post-median. Dorsal area triangular. 

 The buff or salmon-pink colour extending over two thirds of valve. 

 Median area dark-brown, closely covered with elliptical irregular 

 whitish scales. 



Median Valves. —No distinction between lateral and pleural 

 areas. Ground colour, ornamented with six or seven irregular 

 radiating diagonal rows of whitish spathulate scales, which 

 increase in size as they near the posterior margin. 



Dorsal Areas. — Triangular, raised, beaked, smooth, decorated 

 with transverse wavy markings, microscopically longitudinally 

 and transversely striated. Third valve moss-green, and remainder 

 buff with tinge of salmon-pink. 



