ORDER v EUECHINOIDEA SPATANGOIDA 239 



Sub-Family A. ECHINOCONINAE. Duncan. 



Tall, conical, or sub-hemispherical tests, rather flat actinally. Ambulacra with 

 pairs of pores in oblique triplets actinally. 



Echinoconus, Breyn. (Galerites, Lam.) Amb flush or slightly raised, apetal- 

 ous, straight ; some of the plates compound. Peristome sunken, slightly 

 decagonal, symmetrical. Perignathic girdle indicated by a thickening of the 

 I Amb as a low falx- i id^e. Abundant in the Lower and Middle Cretaceous. 



Lanieria, Duncan. Cretaceous or Eocene ; Cuba. 



Sub-Family B. ECHINONEINAE. Desor. 



Test low, tumid, and more or less pulmnate actinally ; peristome central or sub- 



<->'i<1ral diul oblique. 



Echinoneus, van Phels. Amb narrow, actinally unequally broad, owing to 

 obliquity of the large, triangular peristome. Miocene to Recent. 

 Caratomus, Ag. Cretaceous. Amblypygus, Ag. Tertiary. 

 Pygaulus, Ag. (Fig. 384). Test small, thick ; apical system slightly 



FIG 385. 



Ag. Urgonian I'/irina incisa, Ag. sp. Neocoinian (Hils) ; Berklingen, 



(Schrattenkalk);Santis, Switzerland. 1/1- Brunswick. 1/1- 



eccentric in front. Amb narrow, widest at the ambitus ; pairs of pores in simple 

 series, conjugated; the pores of a pair sometimes differently shaped. Cre- 

 taceous. 



Pyrinu, Desm. (Fig. 385). Like the preceding, but pores non-conjugated, 

 and the pairs separated by costae. Cretaceous and Eocene. 



Anorthopygus, Cotteau. Cretaceous (Cenomanian) ; Europe. 



Sub-Family C. ECHINOBRISSINAE. Duncan. 



Test depressed, elongate, tumid. Ambulacra sub-petaloid. Apical system and 

 peristome eccentric; floscelle absent or rudimentary. Interambulacra entering the 

 peristomial margin with a single plate. Periproct supra-marginal. 



Echinobrissus, Breyn. (Nudeolites, Lam.), (Fig. 386). Test ovate, rounded in 

 front, broadest and more or less truncated behind ; or rectangular, with the 

 angles rounded ; or sub-circular ; concave actinally. Amb unequal, open at the 

 end of the sub-petaloid parts ; pairs of pores in simple series, more or less 

 unequal in shape and size, the outer ones elongate; below the sub-petaloid 

 parts the pores are in small oblique pairs, conjugate or riot. Periproct at 



