218 PROF. p. M. DTJlSrCAN's KBTISION OF THE 



of the outer rows elongate, and those of the inner nearly circular ; 

 petals not closed. 



Interradia large, and the tubercles distant, small, and projecting, 

 mamillate, perforate, and crenulated. 



Peristome excentric in front, large, and with a posterior labrum, 

 Periproct flush, broadly ovoid, acuminate above and below, supra- 

 marginal. Fascioles absent. 



Fossil. Cretaceous : Europe, W. Africa. 



There is no doubt that the genus JEpiaster contains species 

 which belong to Micraster, the subanal fascioles of which ai-e not 

 visible, and some to JEEemiaster. JEpiaster de LorioU, Wright, of 

 the English Upper Green sand, when well preserved has a distinct 

 peripetalous fasciole, and is a large, squat JEEemiaster. This was 

 known to Bone the artist ; but Dr, "Wright could not see the 

 fasciole, which is very apparent in the type specimen in the 

 British Museum. Cotteau desired to unite the genus with 

 JKicraster; but there are true species of Epiaster without a sub- 

 anal fasciole, and without the invariably concomitant modifications 

 produced by that fasciole, in the plates and pores of the posterior 

 ambulacra, so well described by Loveu in his ' Etudes.' 



Grenus Epiastee, d'Orligny, 1853, Pal. Fran^., Terr. Cret. Ech. 

 vol. vi. p. 186. 



Test moderate and large in size, cordiform in marginal outline, 

 rather tumid and moderately high, or depressed and much 

 broader than high, with an anterior groove, a rather narrow 

 j)osterior truncation, and a tumid actinal surface posteriorly. 



Apical system subceutral, with four perforated basal plates, 

 and the madreporite usually separating the posterior basal plates, 

 or it may be within the right anterior basal plate. 



Ambulacra diverse, the anterior in the groove, with pairs of 

 small pores on either side ; paired ambulacra petaloid dorsally, 

 long, unequal, sunken, straight, divergent, tending to close or 

 not; pores elongate and unequal. 



Interradia tumid dorsally. 



Peristome transverse, excentric in front, the labrum projecting. 

 Periproct oval, longitudinal, supramarginal, placed in a definite 

 area. Tubercles small, perforate and crenulate, with intervening 

 miliaries, largest near the margin actinally and upon the sternum. 



Fossil. Cretaceous : England, Europe, S. Hindostan, W. Africa. 



