390 Annals of the South African Museum. 



and pedicellariae, white ; muscles at base of spines and glands on 

 globiferous pedicellariae, brown of lighter or darker shades, in more 

 or less abrupt contrast; tubefeet pale brown. 



P.F. 19020. About 160 miles south of Cape Infanta, Cape Colony, 

 3649'S. X 2114'E., 560 fms. Gn. s. 2 specimens; adult. 



Holotype, South African Museum no. A 6452. 



The second specimen is similar to the holotype in nearly every 

 particular, although it is somewhat smaller, measuring about 62 mm. 

 in horizontal diameter; the peristome is less than 15 mm. across. 

 It is however somewhat flatter as the vertical diameter is less than 

 34 mm., instead of 39 as it should be to show the same proportions 

 as the holotype. 



This notable sea-urchin looks like an Echinus and it was a sur- 

 prise to find the pairs of pores uniformly in arcs of four. The 

 pores are large and conspicuous and well-removed from the margin 

 of the plate. It is not inconceivable that these two specimens are 

 the full grown adults of agulliensis, with which species they have 

 much in common. But it is hard to see how a species which after 

 it is 30 mm. in diameter is less than 15 mm. high and has a 

 peristome whose diameter is one-third that of the test or more, can 

 become transformed into such a high species, with so small a 

 peristome, as grandis. The general appearance of the two species 

 is quite unlike but it is possible that abundant material will show 

 that the differences are due to age and individual diversity and are 

 not specific. 



ECHINOMETRIDAE. 



Only one species of this tropical family has straggled southward 

 along the South African coast. It is the following very variable and 

 widely distributed Indo-Pacific species. 



ECHINOMETRA MATHAEI. 



Echinus mathaei Blainville, 1825. Diet. Sci. Nat. : Oursin, p. 94. 

 Echinometra mathaei Blainville, 1830. Dist. Sci. Nat. : Zoophytes, p. 206. 



It is a rather remarkable fact that this very common and wide- 

 spread sea-urchin has never been adequately figured. Under the name 

 E. lucunter, Mr. Agassiz has given a single figure of a nearly bare 

 test (1873, Rev. Ech., pi. IV&, fig. 4) but the long axis of this spe- 

 cimen is less than 10 % longer than the short axis, whereas in many 

 specimens the difference between the two axes is much greater than 

 this and it is not often much less. The species is listed in the 



