EXPLANATION OF PLATES. 



The figures are of natural size unless the amount of enlargement or reduction is 

 stated. The specimens are in the South African Museum except when another 

 collection is mentioned ; those collected by the Survey and by Capt. Garden are 

 from the cliffs near the mouth of the Umzamba Eiver; those collected by Griesbach 

 are labelled " Umtamvuna." 



Plate XXXIII. 



FIGS. PAGE 



1, 2. Pseudodiadema GriesbacM, sp. nov. ... ... ... ... 276 



la, part of upper surface; Ih, side view of the same specimen ; 

 Ic, portion of an interambulacral area from just above the 

 ambitus to near the peristome x 4. 

 2. Ambulacral area x 4. Griesbach Collection. 



3, 4. Cassidulus iivihonatiis, sp. nov. ... ... ... ... ... 277 



3a, upper surface ; 3/^ left side ; '6c, posterior end ; 'id, peristome 

 and floscelle. 



4a, upper surface x IJ ; 4b, right side x 1^ ; 4c, base x IJ ; 4rf, 

 antero-lateral ambulacrum x 4. 



5-7. Car^iasier rt/rican?/s, sp. nov., Griesbach Collection 279 



5a, upper surface ; bh, ventral surface ; 5c, anterior end. 

 6. Part of posterior end showing periproct and fasciole x 3. 

 7a, dorsal surface; lb, left postero-lateral part x 2. 



8,9. Hemiasier Forbesi, Bsi\lj. Griesbach Collection 280 



8a, upper surface; 8h, left side; 8c, part of left half of dorsal 

 surface x 2. 



9. Base. 



10-12. Elea meridiana, lj3i.ng ... ... ... ... ... ... 283 



10. Four normal zooecia and one closed zocecium. The former 

 show transversely elongate apertures with rims thickened dis- 

 tally. The latter has a dome-shaped perforate cap. x about 40. 

 Specimen 4. 



11. Two normal and six closed zooecia. The former do not 

 exhibit the Eleid chai'actei's of a transversely elongate aperture 

 and distally thickened rim so well as those represented in Fig. 10. 

 The closed zooecia are short with dome-shaped, perforate caps, 

 x about 40. Specimen 6. 



12. Six closed zoojcia. One has a flat imperforate covering. In 

 two zooecia the flat covering has a perforation, which in one case 

 is surrounded by a little rim of its own. Two others are produced 

 distally to a snout-like perforated termination. The remaining 

 zooecium resembles the two latter, but is smaller, x about 40. 

 Specimen 4. 



13. A'^?fc«Zaj?a, sp. Griesbach Collection 287 



Eight valve x 3. 



14. Barbatia meridiana, s-p. noY. ... ... ... ... ... 287 



14rt, left valve x 1 J ; lib, dorsal view. 



