46 PBOF. p. M. DTJNCAJS^'S EEVISION Or THE 



Syn. Pseudosalenia, Cotteau, 1859, Eev. et Mag. de Zool. 

 vol. xi, ser. 2, p. 215. Hyposalenia, Desor, 1858, Synopsis, 

 p. 147. Foropeltis, Quenst., 1858 and 1872-5, Petr. Deutschl. 

 tab. 69. 



Test small, circular in outline, tumid at the amibitus, depressed 

 and slightly tumid abactinally, or tall, and with a part of the 

 apical system projecting, actinally rather flatly curved. 



Apical system large, raised slightly, and part of it usually pro- 

 jecting, with large basals and small radials ; a small dorso-central 

 plate, in the long axis of the system, united to the lateral basals, 

 but not touching the posterior basal ; incurved posteriorly for the 

 anterior margin of the anus. Radials large, not within the ring. 

 Periproct posterior and bounded in front by the dorso-central 

 plate, and posteriorly and laterally by the basals 4, 5, and 1. The 

 sutures of the disk often grooved, marked with depressions and 

 the prolongation of the ornamentation of the basal and dorso- 

 central plates ; these plates have grooves and eminences often 

 radiate in arrangement, margins of the basals often variously 

 curved and notched. 



Ambulacra narrow, straight or slightly flexuous, with small 

 primary tubercles near the poriferous zone ; plates low primaries 

 only. Interradia with large primary tubercles diminishing in 

 size above and below the ambitus, crenulate or not and imper- 

 forate. 



Peristome small, rather reentering, slightly incised. Peri- 

 gnathic girdle with low broad ridges and slender unarched pro- 

 cesses. 



Fossil. Cretaceous : England. Upper Jurassic and Cretaceous : 

 Europe. Cretaceous : N. Africa. 



Subgenus Goniophoeus (genus), Agassiz, 1838, Monogr. d'Ech. 



viv. et foss. livr. i. p. 30. Cotteau, 1861, Bull. Sac. GSol. 



France, ser. 2, vol. xviii. p. 624. Duncan and Sladen, 1887, 



Ann. Sf Mag. Nat. Hist. vol. xix. pp. 131-132. 



Test small, swollen, subspheroidal, with large peristome, few 



interradia! primaries, upon high plates. Apical disk pentagonal, 



with five large basals and five small radials, ornamented with 



linear, raised and straight keels which are not on the lines of the 



sutures ; dorso-central plate large, the periproct posterior to it 



and elongate transversely. Pits for spheridia large in the 



narrow ambulacra actinally. 



Fossil. Upper Glreensand : England, Europe, N. Africa. 



