376 



Annals of the South African Museum. 



lacral areas in midzone, about 5'5 mm. wide. Ambulacral plates only 

 9, the uppermost and sometimes the two uppermost without primary 

 tubercles; ambulacra about 4'5 mm. wide in midzone; poriferous 

 areas very narrow, the pore-pairs in almost vertical arcs of three 

 near the outer margin of plate. Primary tubercles relatively large, 

 without crenulation, but conspicuously perforate. Abactinal system 

 8-5 mm. across; oculars moderately large, pentagonal, with pore 

 distal to center, and several small tubercles; all decidedly exsert; 

 genitals large, wider than high, heptagonal, well covered, except 

 along lateral and distal margins, with secondary and miliary tubercles ; 

 genital pore small, situated about half way between center of plate 

 and the distal tip ; with the latter it is connected by a shallow furrow ; 

 anal system 4'25 mm. across, covered by numerous, small, thin, 



Fig. 4. Abactinal view of portion of test of 

 Coenopedina capensis sp. nov. X 5. 



somewhat overlapping plates, a dozen or more of which carry secon- 

 dary tubercles and spines, Peristome 7-5 mm. across, covered by 

 the five pairs of large buccal plates and numerous thin peristomal 

 plates; a few of the largest of the latter carry pedicellariae while 

 the buccal plates in addition to numerous small tridentate and ophi- 

 cephalous pedicellariae, carry a very few secondary spines ; gill cuts 

 so shallow as to be barely perceptible. 



Primary spines all broken, so it is impossible to state their length 

 definitely, but the largest were -75--80 mm. in diameter at base and 

 were thus probably 15-20 mm. long; they are not at all hollow and 

 the surface is covered with 25-30 very delicate, parallel, longitudinal 

 ridges, which are microscopically serrate; secondary spines similar 

 but conspicuously smaller. 



