GENERA AND GROUPS OP THE ECHINOIDEA. 155 



primary, the aboral a sraall demi-plate ; interporiferous areas 

 broad, perforated. Pores of the uon-petaloid parts oblique. 



luterradia small, discontinuous actinally, more or less per- 

 forated, grooved or not. Peristome with ten ambulacral and 

 five interradial plates, two hidden spheridiain each ambulacrum. 

 Jaws and perignathic girdle as iu Clypeaster. Periproct infra- 

 marginal, in or close to the edge. 



Internal structure with tall pillars, more or less united, and 

 expanding at the roof and floor, placed so as to bound the 

 ambulacra incompletely, and to reach some distance towards the 

 centre of the test ; some needles. Concentric partitions absent 

 near the edge, and the inner wall of the ambulacra also. 



Spines sraall, cylindrical, largest actinally, and sometimes 

 spatulate. 



Becent. Japan, Eed Sea, Sandwich Islands, La Paz, Australia. 



Flesiantlius {■= Echinanthus) testudinarius. Gray, sp., is the 

 type. 



Genus Anomalanthus, J. Bell, 1884, Broc. Zool. Soc. Bond, 

 p. 40. 



Syn. Echinanthus, A. Agass. 1872-74, pars (see Eev. T. Woods, 

 1877-1878, Proc. Linn. Soc. N.S.W. vol. ii. p. 169). 



Test large, ovoid in tumid marginal outline, high, swollen, 

 flattened near the apex, which is slightly anterior. Peristome 

 deeply sunken, grooves very slight. 



Madreporite central, star-shaped ; genital and radial pores 

 variable in size. 



Ambulacra apetalous, the poriferous zones abaetinally broad, 

 increasing in breadth to close to the margin, diverging gradually 

 and becoming very wide apart, even tending to the lyrate form ; 

 pairs of pores very diverse in size, united by shallow grooves, 



Periproct elongated transversely at the ambitus. 



Becent. Australia. 



It is interesting that there should only have been one large 

 and mutilated specimen of the species " tumidus," Woods, but 

 Prof. J. Bell made the most of his opportunity. There is a true 

 Glypeaster in the Eocene of Kutch (Kachh) which has lyrate- 

 shaped semi-petals (Duncan and Sladen, 1883, Monogr. Tert. 

 Ech. Kachh and Kattywar, Pal. Indica, ser. xiv. p. 11). 



