372 



Kingsniills; China; East India Islands ; Mauritius. 



(SPATANGUS.) Eupatagus. 



Eupatagus Ac ASS., 184 7. Aim. Sc. Nat.. VIII. 



Test thin, depressed, elliptical. Ambulacral petals arched, not sunken, 

 closed ; interambulacral areas covered by large tubercles, as in Spatangus 

 proper, crenulate and perforate, but not extending beyond the elliptical 

 peripetalous fasciole. No anterior groove; subanal fasciole present, no large 

 tubercles in the odd interambulacral space. 



The identity of Eupatagus and Plagionotus (Metalia), suggested by Haime, 

 does not seem to extend to more than a close affinity; Eupatagus forming, as 

 it were, a connecting link between the true Spatangoids, which have a pitted 

 anal plastron, and the Brissidae, where the anal plastron is simple. This 

 genus has the peripetalous fasciole of Plagionotus (Metalia), while it has the 

 ambulacra of Spatangoids proper. 



Eupatagus Valenciennesii 



! Eupatagus Valeuciennesii AGA8S., 1847, C. R. Ann. Sc. Nat., VIII. p. 9. 



PI XV. f. 8-4. 



Test thin, depressed ; outline from above elliptical; elongated posteriorly; 

 posterior interambulacrum truncated. Posterior pair of petals once and a 

 half as long as the anterior pair, with a nearly elliptical interporiferous space. 

 pointed towards the apical system, rounded at the extremity, and closed. An- 

 terior pair lanceolate, pointed at the extremity; anterior poriferous zone nar- 

 row; posterior zone twice as broad as the anterior one. Poriferous zone of 

 the posterior ambulacra slightly broader than the posterior zone of the an- 

 terior ambulacra. Poriferous zones of petals consisting of an inner row of 

 rounded pores, conjugated by an indistinct furrow, with the outer large 

 triangular pore ; poriferous zones of lateral petals slightly sunken ; odd an- 

 terior ambulacrum reduced to minute pairs of pores placed close together. 



