The Cretaceous Fauna of Poncloland. 279 



by de Loriol/'' who, however, found it necessary to substitute the 

 name Asterobrissus for Trochalia, since the latter had ah-eady been 

 employed for a gasteropod. The differences between Asterobrissus 

 and Cassidulus are very slight, and Duncan f regarded the former as 

 a synonym of the latter, with which opinion M. Jules Lambert is 

 inclined to agree. 



Four or perhaps five species of Cassidulus occur in the Utatur 

 and Ariyalur Groups of Southern India, :[: but do not show any close 

 resemblance to C. imibonatus. In the Cretaceous beds of the United 

 States, 5 seven species of Cassididus have been found, five of which 

 occur in the Eipley Group of Alabama and Mississippi, and one in 

 the Colorado Group. 



Family ECHINOCOEYTHID^. 



Genus CAEDIASTEE, Forbes. 



Caediasteb africanus, sp. nov. 



Plate XXXIII., figs. 5-7. 



1871. Holaster indicus, Griesbach, Q.J.G.S., xxvii., p. 67 ('«07i Forbes). 



Description. — Test small, cordiform ; length and breadth equal or 

 nearly equal ; greatest breadth just in front of the middle of the 

 length. Greatest height in front of the apical disc. Anterior half of 

 test broad and rounded ; posterior half narrowing rapidly, with the 

 posterior end truncated. Upper surface of test convex, sloping from 

 the apex posteriorly, and more rapidly to the sides. Lower surface 

 flattened, but concave around the peristome. 



Apical disc nearly central, the individual plates indistinguishable. 



Anterior ambulacrum in a deep, broad furrow, which is continued 

 to the peristome and causes a deep indentation in the anterior 

 margin of the test ; the furrow is bounded on each side by a rather 

 prominent and more or less angular keel. Pores rounded, close 

 together, placed obliquely. Interporiferous zones with granules. 



Antero-lateral ambulacra with the poriferous zones reaching to 

 between three-quarters and five-sevenths of the distance from the 

 apex to the margin of the test. Anterior poriferous zone narrow ; 



* Stratigr. et Paleont. d'Angola. Mem. Soc. Phys. et d'hist. nat. de Geneve, 

 vol. XXX. (1888), No. 2, p. 104. 



t Revision of the Echinoidea, Journ. Linn. Soc, voL xxiii. (Zool.), 1889, p. 177. 



I Stoliczka, Cret. Fauna S. India, vol. iv., 3 (1873), pp. 29-33. 



§ W. B. Clark, Mesoz. Echinoderm, U.S. (Bullet. U.S. Geol. Survey, No. 97, 

 1893), pp. tJ6-73. 



