The Echinoderm Fauna of South Africa. 345 



ornate pattern ; the dorsal side of the ar.ms is very prettily marbled 

 with dull purplish and whitish ; the under surface is white but on 

 each arm is a broad, dull purple, longitudinal stripe which does not 

 decrease in width distally and hence comes to occupy the entire 

 under surface of the arm. Such a stripe is faintly indicated on 

 some other specimens. 



P.F. 507 A. Algoa Bay, 3358''S. 2551'E., 25 fms. R., blk. 

 sp. 2 specimens; adult. 



P.F. 859. Off Great Kei River, 32 45' S. X 28 26' E., 36 fms. 

 St. 3 specimens; young. 



P.F. 12361. Umhlangakum River, N.W. by W., 7 miles, 50 fms. 

 S. and sh. 3 specimens; adult and young. 



P.F. 12405. Itongazi River, N.W. a / 4 W., 3 miles, 25 fms. S. and 

 st. 5 specimens; adult and young. 



P.F. 13068. Hood Point, N.W. by W. '/ 2 W., 11 miles, 49 fms. 

 Brk. sh. 1 specimen; young. 



P.F. 13280. Cove Rock, N.E. by E. '/ 2 E -, * miles, 22 fms. R. 

 and brk. sh. 1 specimen; small adult. 



P.F. 13520. East London, N.W. by W. V 2 W., 2 miles. Depth .' 

 S. and brk. sh. 1 specimen; small adult. 



Bathymetrical range, 22-50 fms. 



OPHIOCHITON AUSTRALIS *, sp. nov. 

 Plate XX. Figs. 1, 2. 



Disk 8 mm. in diameter; arms 55-60 mm. long. Disk covered 

 by a coat of thick, irregular, overlapping scales, many of which are 

 50- - 75 mm. across and among which the six primary plates can 

 hardly be distinguished. (They are evident in the smaller specimen, 

 which is 6 mm. across the disk.) Radial shields small and widely 

 separated ; not much larger than the largest disk scales, in the 

 smaller specimen; in the holotype they are about 1*5 mm. long, 

 80-1 mm. wide just distal to the middle and about -75 mm. apart. 

 Upper arm-plates broadly hexagonal, 1-5-1-8 times as wide as long, 

 the distal side slightly convex and occupying the full width of plate, 

 the proximal margin only a little more than half as much; the 

 disto-lateral angles are often a little rounded; the plates are in con- 

 tact for the full width of the proximal margin. Interbrachial areas 

 below covered by coarse, overlapping scales, no one of which is 

 large or conspicuous. Oral shields, rhomboidal or spear-head-shaped, 

 decidedly longer than wide, with all angles, except possibly the 



* austrahs = southern, in reference to the locality where found. 



