236 PROP. P. M. DTJlSrCAN S EETISIOK OF THE 



Genus Oenithastee, Cotteau, 1886, Ech. nouv. ou peu conmis, 

 Bull. Soc. Zool. de France, vol. xi. p. 710. 



Test moderate in size, thick, slightly elongate, tundd above, 

 broadest and rounded in front, subtruncated behind, highest near 

 the posterior surface, broader than high. No anterior groove. 



Apical system exceutric in front, subcompaet, with four close 

 genital pores. 



Ambulacra dissimilar, all flush, narrow, and enlarging slightly 

 to the ambitus ; the anterior without a groove, with simple pairs 

 of pores arranged more or less obliquely. The paired ambulacra 

 slightly subpetaloid, open ; the inner pores circular and the outer 

 comma-shaped ; pairs close abactinally and distant at the ambitus. 

 Interradial ornamentation of numerous small scrobiculate 

 tubercles most frequent actinally and much granulation. 



Peristome rather large, subcircular, superficial, slightly ex- 

 centric in front, without a trace of labrum or phyllodes. Peri- 

 proct circular, at the summit of the posterior truncation. 



A peripetalous fasciole well developed, not sinuous, approach- 

 ing the periproct, but anteriorly and superiorly, and crossing the 

 ambulacra above the ambitus and sloping in front so as to be at 

 a much lower level there than posteriorly. 



Fossil. Eocene : Europe (Spain). 



M. Cotteau places the genus near Goraster, Cotteau. 



Genus Coeastee, Cotteau, 1886, 'Bull. Soc. Zool. de France, 

 vol. xi. p. 708. Seunes, 1888, Bull. Soc. Ghol. de France, 

 ser. 3, vol. xvi. p. 801. 



Test small, thick, circular iu marginal outline, subtruncated 

 posteriorly, regularly tumid and high dorsally. A very small 

 anterior furrow. 



Apical system subcompaet, with four basal plates and each with a 

 pore, and the madreporite not separating the postero-lateral plates. 



Ambulacra dissimilar, flush, straight, narrow, enlarging with 

 approach to the ambitus ; the anterior with minute distant pairs 

 of pores ; the paired ambulacra with the inner row of pores 

 circular, and the outer comma-shaped and oblique. 



Tubercles abundant, small, scrobiculate, and with homogeneous 

 miliaries. 



Peristome very excentric in front, slightly sunken, subcircular, 

 and with a posterior labrum which projects. Periproct circular, 

 at the top of the posterior truncation. 



