662 



PROF. J. W. GREGORY ON 



[Nov. 1911, 



for his careful examination of several of the species, as also for his 

 valuable notes concerning their affinities. 



The list of the chief echinoids collected is as follows : — 



Clypeaster biarritzensis Cott., 



var. trotteri nov. 

 Fibular ia Sudani (Lor,). 

 Scutetta tenera Laube. 

 Amphiope di/ffi, sp. nov. 

 Amphiope sp. 

 Echinolampas ckerichcrensis Gauth. 



Echinolampas discus Desor. 

 Hypsocli/peus hemisphericus (Greg.) 

 Hemiaster scillce Wright. 

 Schimster ederi, sp. nov. 

 $ar sella lamberfi, sp. nov. 

 Euspata>/g/is sp. 



Description of the Species. 



Clypeaster biarritzensis Cotteau, 1873, var. trotteri nov. 1 

 (PI. XLV1I, figs. 1 « & 1 6.) 



Clypeaster biarritzensis Cotteau, 1873, in R. de Bouille, ' Pal. Biarritz,' p. 10. 



[Not seen.] 

 Clypeaster biarritzensis Cotteau, 1891, ' Ech. Eoc, Pal. franc. : Terr. Tert.' 



vol. ii, p. 228 & pi. cclx. 

 Clypeaster biarritzensis Flick, 1900, ' Priab. en Tunisie ' C. R. Acad. Sci. 



Paris, vol. cxxx, p. 149. 

 Clypeaster biarritzensis Pervinquiere, 1903, ' Geol. Tunisie-Centrale ' Carte 



Geol. Tunisie, p. 199. 



Characters. — Form and dimensions similar to those normal to 

 the species. Petals of ambulacra shorter, the poriferous zones 

 broader, and the distal ends less open than in the typical form. 



Dimensions in 

 millimetres. 



(Y qq C. biarritzensis. 

 Cotteau'* tig. 



C. breuniffi. 



Laube's | E. of 

 type. ; Siwa. 



C. subpla- 



cunarius. 



Fuchs's type. 



Length 



Breadth 



Height 



Length of anterior 



petal 



Distance from proximal 

 end of anterior petal 

 to anterior margin 

 of test 



70 66 

 67-5 59 

 11 9 



19-5 21 

 34 31 



46 60 

 41 ! 50 

 10-5 11 



135 16*5 ") 



22 ; 24 J 



91 



88 

 12 



length=not 

 quite two- 

 thirds of 

 the radius. 









Distribution. — Typical form: Upper Eocene; Lou Cout near 

 Biarritz. Gebel Batene, Tunisia. 



Var. trotteri. In a pale-yellowish marly limestone containing 

 many specimens of Oj/erculina lihyca. Haifa mile east of the camp 

 at Ain Sciahat, Cyrene (Cy 98). 



Cy 273. Ain Sciahat, in a soft marly Ojwrculina Limestone. 



1 The variety is named after my companion, Dr. J. Trotter, who collected 

 one of the two specimens. 



