<>M I II... in I 



closer, M>D Vtfging tOWftrd tin- dorsal riil^r. and oftni /igzagged ; the 

 median triangle of the central arras >inooth. A ntrrior valve having 

 8 narrow rays of ryes, i.rra-ionally with ,-onie eye- >eatt red between 

 along the lower margin ; the intervals between the eye-rays sculpt- 

 ured with sulei forming short arcs of concentric grooves. Posterior 

 valve depressed, triangular; // /on/tit from sinus to ///' //".iterior 

 terminal inncro briny one- half the greatest breadth of its tegmentum. 



Interior white, with a large spot of rich brown in each valve. 

 Sinus delicately toothed, wide and deep. Anterior valve having 8 

 slits, median valves 1 slit ; teeth finely and sharply pectinated out- 

 side. Posterior valve having a smooth ledge of callus in plate of 

 the insertion-plate, flat behind, rounded at the sides. Eaves narrow, 

 grooved, solid. 



Girdle fleshy-brown, leathery. 



Length 24, breadth 15 mill.; divergence 110-115. 



Mauritus and Bourbon (Reunion.) 



Chiton maillardi DESH., Moll, de File Reunion, p. 38, t. 5, f. 14. 

 Chiton (Toniciaf) maillardi MARTENS, in Mobius' Reise nach 

 Mauritius, p. 300. Ornithochiton maillardi CPR., MS. Ornitho- 

 chiton sp., MOSELEY Quarterl. Journ. R. Mic. Soc. xxv, p. 54, t. 5, 

 f. 4-7. 



O. LITERATUS Krauss. PI. 55, figs. 21, 22, 23. 



Shell ovate, convex ; brown, spotted with whitish and having a 

 whitish longitudinal band ; closely silicate. Interior white, brown- 

 ish-violet in the middle. Anterior valve lunate, convex with 

 undulating grooves ; posterior valve triangular, depressed, sculptured 

 with angular grooves; intermediate valves sinuated in front, 

 rounded at the sides, undulately and angularly grooved. Girdle 

 rufous-brown, leathery, velvety. 



Length 12, breadth 8 lines. (Krauss.) 



Natal. 



Chiton literatus KRAUSS, Die Siidafrik. Moll. p. 36, t. 3, f. 6. 



I have not seen this secies, which is evidently quite distinct, 

 although allied to 0. maillardi. The central areas have angular or 

 zigzag grooves; the lateral areas are not raised, and are sculptured 

 with wavy grooves. The back is not carinated. Insertion plates as 

 usual in the genus. 



