Vol. 67. | THE FOSSIL ECHINOIDEA OP CYRENAICA. 669 



Tunisie avec YE. perrieri de 1 Egypte, je crois qu'il existe dans l'Afrique du 

 Nord, dans la Cyrenaique et la Tunisie, un Echinolampas de forme assez 

 variable, a petales plus ou rnoins developpes, qui eonstitue une espece 

 actuelleruent reunie par les auteurs a YE. perrieri de Loriol des environs de 

 Thebes. 



' Je n'hesite done pas a determiner ces Echinolampas Nos. 229, 279, etc., 

 comme Echinolampas perrieri Cotteau, mais je n'ai pas de materiaux suffisants 

 pour affirmer l'identite de cette forme avec YE. perrieri de Loriol.' 



M. Gauthier has established the name E. chericherensis for these 

 Tunisian echinoids, and that name may be provisionally accepted. 

 The inclusion of .such wide variations in one species will render 

 necessary the abandonment of several accepted species, and the 

 name chericherensis will doubtless have to be abandoned in favour 

 of some earlier name ; but it may be conveniently used until this 

 group of species has been revised. 



Echinolampas chericherensis Gauthier, 1899. (PI. XLVIII, 

 figs. 1 a, 1 6, & 2 ; PI. XLIX, figs. 1-3.) 



Echinolampas chericherensis Gauthier in Fourtau, 1899, ' Rev. Ech. Foss. 



Egypte ' Mem. Inst. Egypt, vol. iii, fasc. 8, p. 732. 

 Echinolampas chericherensis Pervinquiere, 1903, ' Geol. Tunisie Centrale ' 



Carte Geol. Tunisie, pp. 198, 200, 201, 202, 204. 

 Echinolampas perrieri Cotteau, 1890, 'Ech. Eoc., Pal. Francj. : Terr. Tert.' 



vol.ii, p. 126 & pis. ccxli, ccxlii, figs. 1-2. 

 Echinolampas perrieri Gauthier in Fourtau, 1899, op. cit. p. 659. 

 Echinolampas perrieri Flick, 1900, ' Priabonien en Tunisie ' C. R. Acad. Sci. 



Paris, vol. exxx, p. 149. 

 Non Echinolampas perrieri de Loriol, 1880, ' Monogr. Ech. Nummul. Egypt.' 



Mem. Soc. Phys. Hist. Nat. Geneve, vol. xxvii, pt. i, p. 95 & pi. v, figs. 2-2 b. 

 Non Echinolampas perrieri de Loriol, 1883, 'Eoc. Ech. iEgypt.' Palaeonto- 



graphica, vol. xxx, pt. 2, p. 25 & pi. vii, figs. 2-3 a. 

 Echinolampas ziqnoi Oppenheim, 1900, ' Priabonaschichten ' Palseontographica, 



vol. xlvii, p. 103 & pi. ix, figs. 3-3 b. 

 Echinolampas hydrocephalus Oppenheim, 1900, ibid. p. 103 & pi. xvii, 



figs. 5-5 b. 

 Echinolampas blainvillei Oppenheim, 1900, ibid. p. 102 & pi. ix, figs. 1-1 b. 

 Non Echinolampas blainvillei Agassiz, 1847, 'Cat. Rais.' Ann. Sci. Nat. 



[Zool.] ser. 3, vol. vii, p. 164. 

 Non Echinolampas blainvillei Tournouer, 1869, ' Rec. Ech. de l'Etage du Cal- 



caire a Asteries du S.O. de la France ' Actes Soc. Linn. Bordeaux, vol. xxvii, 



pp. 286-90 & pi. xvi, figs. 1-3. 



The echinoids referred, in deference to M. Lambert's opinion, to 

 one species include five main variations. 



The commonest form (var. a) most resembles Dr. Oppenheim's 

 blainvillei, with a pentagonal form and a well-rounded upper 

 surface. 



Var. b is a more flattened variety, which is also subpentagonal ; 

 it has afiinities with E.falloti Cott., 1 but is more depressed. 



Yar. c approaches most nearly to the Tunisian forms figured by 

 Cotteau, which may be regarded as the type of E. chericherensis. 



Yar. d is the same as Dr. Oppenheim's E. hydrocephalus. 



Yar. e is unusually wide behind, and approximates to the 

 Tongrian E. poster olatus Greg. 



1 G. Cotteau, 'Ech. Eoc, Pal. Frang. : Terr. Tert.' vol. ii (1894) p. 737 & 

 pi. ccclxxix, figs. 1-3. 



2z 2 



