[N.8^1 



] Breynia vredeuhiirgi. l47 



miliaries between. From the ambitus the tubercles increase in 

 size toward the peristome, being perforate and crenulate with 

 smooth scrobicules, the anterior margin of which is slightly raised, 

 thus producing a somewhat imbricated appearance. 



A large spine, curved near the base, surmounts the primary- 

 tubercles abactinally ; and similar, but shorter spines spring from 

 the remaining tubercles. The actinal radioles on the primary 

 tubercles possess a very oblique collar. 



The test and spines are uniformly white. 



This species differs from Breynia australasim : 



1. In the steep anterior margin of the test. 



2. In the presence of only one or two primary tubercles in 

 the antero-lateral ambulacra and their absence from the postero- 

 lateral ambulacra. 



3. In the anterior position of the apical system. 



4. In the length of the extra- petaloid part of the test behind 

 the postero-lateral ambulacra. 



5. In the shape of the internal fasciole. 



6. In the number of plates within the subanal fasciole. 



7. In the great breadth of the bare paths on either side of 

 the sternum and their rectilinear boundaries. 



' ^ 8. In the great length and narrowness of the labrum. 



9. In the small size of the sternum. 



10. In the presence of all the interambulacra in the peris- 

 tome margin, the paired ones being completely excluded in the 

 case of Breynia aitstralasise. 



11. In the narrowness of the ambulacral petals. 



It is interesting to notice that as regards points 3, 4, 5, 7, 8, 

 9, 10 and 11, this species agrees very closely with two fossil 

 forms Breynia carinata. dMrchiac, and Breynia 



forma 



tions (upper and middle oligocene) of Western India, the Gaj 

 species having also been found in Java. The ^'haracters that 

 differentiate these fossil species from the recent Ii dian and Paci- 



forms 



Records 



part 4 ) 

 e abactinal 



constitutes th¥" most 



conspicuous difference between the three Indian species, being 

 very abundant in the Nari species, somewhat sparer in the Gaj 

 one, almost obsolete in their recent successor. 



I vredenhurai is remarkable for the large number of 



ambulacral 



than 



is known in any other Spatangoid. In Breynia australasisd the 

 correspondincr number is seven. It is difficult to make out 



