208 PBOP. p. M. Duncan's REvrstoisr op the 



second plate of this stretches across and occludes the fellow plate 

 from the peristomial plate. 



Peristome exceotric in front, elliptical and broadest transversely. 

 Periproct supramarginal, oval. 



Ornamentation of small primary tubercles raised above the 

 general surface ; granules exist in numbers and limit the plain 

 scrobicules. 



Fossil. Cretaceous : England, Europe, Asia, "W. Africa. 

 Miocene : Australia. 



It is hardly possible for Holaster Campicheanus, d'Orb., to 

 rema'nin the genus, and H. Indicus, Eorbes, may be a Cardiasfer. 



Subgenus Lampadastee, Cotteau, 1889 (genus), Bull. Soc. Zool. 

 de France, vol. xiv. p. 88. 



Appears to be an Holaster with a pronounced ambulacral 

 groove at tlie ambitus anteriorly, with large, distant, broadly scro- 

 biculate tubercles especially abundant dorsally ; the periproct 

 below a posterior rostration. 



Fossil. Cretaceous: Madagascar. 



Genus Ofpastee, Desor, 1858, Synopsis, p. 333. De Loriol, 

 Ech. desFnv. de Camerino, 1882, p. 10. Loven, 1883, Pour- 

 falesia, p. 92. Gauthier, 1887, Bull. Soc. d. Sci. de V Yonne, 

 vol. xli. e (pub. 1888), p. 403. 



Test small, tumid, globose or conical or cordiform, flat or 

 tumid actinally. 



Apical system elongate ; the madreporite in the right anterior 

 basal plate. A doubtful or absent anterior groove. 



Ambulacra flush, apetalous, with few high plates with minute 

 circular pores in pairs, which diminish in size and increase in 

 distance towards the ambitus, and are larger at the peristome. 



Interradial plates high, larger than those of the ambulacra ; the 

 postero-lateral areas unsymmetrieal actinally on account of the 

 fusion of the second plates of the right posterior area ; a narrow 

 posterior peristomial plate with a small labrum, and posteriorly 

 is a long meridosternum. 



Peristome excentric in front, broader than long, oval. Periproct 

 circular or ovoid, supramarginal. A marginal fasciole may occur. 



Fossil. Cretaceous : England and Europe. 



Certainly no forms with compact apical systems can enter. 



