260 Annals of the South African Museum. 



granules along each of the opposed margins. - - Colour in alcohol, 

 pale brown, becoming brownish-white on drying. 



P.F. 15147. Table Mountain, E. by S. / a S., 25 miles, 190 fms. 

 Gr. s. and bl. sp. 3 specimens. Adult. 



Holotype, South African Museum, no. A 6414. 



I had determined to call these three specimens patagonicus but 

 Fisher thinks they are nearer to his recently described C. smiihi 

 from the Philippines, in 554 fms. He says that the South African 

 specimens differ from smithi in the clean cut hexagonal tabulae of 

 the mid-radial areas, the more numerous abactinal granules (only 

 10-15 central granules on largest tabulae in smithi}, in the smooth 

 tips of the subambulacral and furrow spines, in the lower abactinal 

 pedicellariae, and in the larger oral plates. From patagonicus (of 

 which I have seen no specimens) Fisher tells me the South African 

 species differs "in having narrow, sunken, wholly granulated mar- 

 ginal plates, broader abactinal radial plates with more crowded, 

 numerous granules, large instead of small plates in center of disk, 

 a different sort of actinal pedicellaria, etc." It seems to me very 

 clear that patagonicus, smithi and chondriscus are very closely related 

 forms and that we shall not know the true interrelationship until 

 we have far more material. 



CERAMASTER TRISPINOSUS *, sp. nov. 

 Plate XIV. Figs. 3, 4. 



R = 41 mm.; r = 21 mm.; R = l < 95r. Interbrachial arcs broad- 

 ly rounded ; rays bluntly pointed. Abactinal plates tabulate, poly- 

 gonal, of diverse sizes and closely crowded ; most of the plates are 

 rather large with a marginal series of 10-20 coarse, rounded gra- 

 nules and 10-20 similar, not crowded, granules within the marginal 

 series; smaller plates have 6-12 marginal granules and 4-10 more 

 on the top; the five basal plates are easily distinguishable, as one 

 is somewhat crescent-shaped and encloses the madreporite on its 

 outer side, while the other four have more numerous and smaller 

 granules than the other tabulae, about 30 in the marginal series and 

 about 35 within. Superomarginal plates 13 or 14 on each side of 

 each ray or 26 or 28 on each side of the pentagon ; the interradial 

 pair are, each 4 mm. wide and 3 mm. long, with the inner end so 

 curved as to be almost a semicircle ; they are fully covered by about 

 150 granules, of which the largest are on the lower margin, next 



* trispinosus = having three spines, in reference to the armature of the adam- 

 bulacral plates. 



