226 Frof. Gregory — Fossil Echinoidea frotn Sinai and Egypt. 



Distribution. — Turonian : S. France, and Tebessa, Algeria. 

 ? Cenomanian — Cretaceous Marls : Sinai, Wadi Ragga (L 4123) ; 

 and head of Wadi Ethal (J 3873). 



This species is represented by three specimens, of which the two 

 from the Wadi Eagga show all the characters very well. They 

 resemble the Cenomanian H. crassus, of which it is possible that 

 they are young specimens. 



Their dimensions are : — 



The ornamentation and shape agree with H. tiironensis better than 

 with H. crassus. The periproct notches the hinder margin, as much 

 as in the French specimens, whereas the Algerian specimens are 

 said by Cotteau, Peron, & Gauthier (op. eit., p. 88) only rarely 

 to do so. 



3. HoLECTYPus LARTETi (Cotteau), 1867.^ 



Cotteau, Notice E'ch. foss. recueillis par Lartet pendant voyage due de Lujues: 



Bull. See. geol. France, ser. ii, vol. xxvi (1869), p. 537. 

 Lartet: Explor. geol. Mer Morte, Paris (1877), p. 155, pi. xiv, figs. 1-5. 



Distribution. — Cretaceous: Mt. Hor (coll. Lartet). Cretaceous 

 Marls : head of Wadi Ethal, Sinai. L 3873. Coll. T. Barron, Esq. 



This species, by its small periproct, has some resemblance to 

 Discoidea, but the peristome is typically that of Holectypus. The 

 largest of the three specimens is 23 mm. in diam., and 12"25 mm. in 

 height. 



According to Lartet's figure the diameter of the type-specimen is 

 25 mm. and its height 13 mm. The nearest Algerian species is 

 Holectypus chauveneti, P. & G.,' in which the diameter and height 

 are 18 mm. and 8 mm. I'espectively. 



Family GALERITID^. 

 GALERITES, Lamarck. 

 Galebites thomasi (Peron & Gauthier), 1878. 

 Echinoconus thomasi, Peron & Gauthier, 1878 : E'ch. foss. Alger., fasc. 5, p. 162. 



Distrihdion. — Cenomanian: Algeria (Berouaguiah) ; head of Wadi 

 Ethal, Sinai. ? L 3873. Coll. T. Barron, Esq. 



This species was founded on a very imperfect specimen which 

 showed neither periproct nor peristome, so that the identification is 

 doubtful. 



L 3873 includes only one imperfect, worn specimen, which has 

 the tumid margin, a slight actinal flattering, a large subpentagonal 

 peristome, which is large for this genus, and a submarginal periproct. 



The apical system agrees with that of Galerites thomasi. 



1 Compt. Rend., vol. ixxviii (1867), p. 198. 



^ Peron & Gauthier: E'ch. foss. Alger., fasc. 5, p. 172, pi. xii, figs. 3-6. 



