Vol. 67.] THE FOSSIL ECEINOIDEA OF CYKENAICA. 677 



M. Lambert has kindly examined this specimen, so as to compare 

 it with Lovenia sulcata aud his own L. lorioli Lb., and he regards 

 it as distinct from them and as a new species. He says : — 



' Elle se distingue de 8. sulcata Haime (Breynia) par son sillon qui ne remonte 

 pas jusqu'a l'apex et est remplace en dessus par le petit bouclier plat 

 circonscrit par le fasciole intrapetale. 8. lorioli Lb., comme 8. mauritanica 

 Poinel plus etroit en arriere, out leur face posterieure rentrante, tandis que 

 cette face est oblique chez l'espece de la Cyrenaique. Le 8. mauritanica 

 Gautbier parait etre toute autre cbose. 8. anteroalta Gregory, pourvu 

 d'auipoules internes et a plastron lis^e, est 1111 Lovenia. II en serait de merne 

 de Sarsclla duncani Gregory, d'apres les figures de Wright; ce dernier est 

 tuoins large en arriere, ses pores sont inoins longuement atrophies, le meplat 

 entourne par le fasciole interne est chez lui moins saillant que chez l'espece 

 de la Cyrenaique, qui me parait constituer reellement une espece nouvelle. 

 Eupatayus tuberculosa Fraas, plus grand, aurait, d'apres Gauthier, deux 

 des branches de ses petales pairs qui remonteraient jusqu'a l'apex sans 

 s'atrophier ; il manquerait done de fascioie interne.' 



Euspatangus sp. 



A spatangoid from the Operculina Limestone at Ain Sciahat is 

 too deformed and sand-worn for determination. The restricted 

 distribution of the large tubercles indicates a peripetalous fasciole, 

 and thus the genus is either Breynia or Euspatangus. M. Lambert 

 has kindly examined the specimen, and suggests its comparison 

 with Euspatangus cossoni Gauth., from the Upper Limestone with 

 Nummulites, in the Gebel Cherichera in Tunisia. The subanal 

 area is worn, but the echinoid probably had a subanal fasciole and 

 is therefore a Euspatangus ; the species, however, is smaller, the 

 anterior sulcus steeper, the anterior height greater, and the front 

 steeper than in Y. Gauthier's x type of E. cossoni. 



The Affinities of the Echinoid Faunas. 



The Echinoids belong to four horizons. The uppermost fauna is 

 represented by some Clypeaster fragments and the Hypsoclypeus at 

 Birlibah, and by the Scutellas and Clypeasters seen in the lime- 

 stones on the coastal plain between the foot of the Tokra Scarp and 

 Benghazi. The age is Miocene and probably Helvetian. 



The second fauna includes Echinolampas discus, Eemiaster scillce, 

 Schizaster ederi, Sarsella lamberti, Euspatangus sp., and Clypeaster 

 biarritzensis var. trotteri. The typical form of the last species is 

 Upper Eocene. According to M. Lambert the Schizaster is a closer 

 ally of the Tongrian Sch. rimosus than of the Aquitanian and 

 Langhian species Sch. desori. Nevertheless, the evidence of these 

 echinoids as a whole led me to regard them as Aquitanian, and 

 Mr. Newton's identification of the associated mollusca agrees with 

 that view. These echinoids were found in the limestones above 

 the Fountain of Apollo at Ain Sciahat, and on the plateau east of 

 Derna. 



The third fauna includes the common but variable species of 



1 ' Ech. Foss. Sud des Hauts-Plat. Tunisie ' Explorat. Sci. Tunisie, Paris, 

 1889, p. 91 & pi. vi, figs. 1-3. 



