Vol. 67.] THE FOSSIL ECHINOIDEA OF CYKENAICA. 671 



Var. d: Slonta (Cy 295a and 151); east of Slonta (229); with 

 Fimbria lamellosa and Scutella sp., at some old cisterns, east of 

 Slonta (294 a). 



Yar. e : plateau near Messa ; and south of Wadi Firyah, north- 

 east of Slonta. 



Echinola3ipas discus Desor, 1858. 



Echinolampas discus Desor, 1858, 'Syn. Ech. Foss.' p. 307. 



Echinolampas discus Dames, 1877, ' Ech. Vic. & Ver. Tert.' Palseontographica, 



vol. xxv, p. 43 & pi. iii, figs. 1 a-1 c. 

 Echinolampas discus Oppenheim, 1902, ' Eev. Tert. Ech. Venet. &c.' Zeitschr. 



Deutsch. Geol. Gesellsch. vol. liv, p. 216. 



Distribution. — Italy: Schioschichten, xiquitanian. Castello 

 di Schio, E-occa di Garda, etc. Cyrenaica : in grey Operculina- 

 Limestone, 150 feet above the Fountain of Apollo, Ain Sciahat, 

 Cyrene. 



Dimensions in millimetres: — 



Cyrene Dames's E. amplus 

 No. 9. figured specimen. Fuchs. 



Length about 90 73 120 



Breadth 86 68 110 



Height 26 30 37 



(a little flattened 

 by crushing). 



Affinities. — This species has been recorded by Cotteau from 

 the Eocene of Alicante in Spain ; but Dr. Oppenheim throws doubt 

 on the identification, and it requires confirmation. Dames regards 

 Laube's Echinolampas conicus 1 as a synonym, although Laube's 

 figure represents the apical disc as behind the centre, instead of 

 well to the front ; the antero-lateral ambulacra of E. conicus are 

 also represented as straighter. 



The species is closely allied to E. amplus, Fuchs 2 from the 

 Miocene of Siwa ; but E. amplus is flatter, and has a more central 

 apex and broader poriferous zones in the ambulacra. 



Hypsoclypeus hemisphericus (Gregory), 1891. 



TLeteroclypeus hemisphericus Gregory, 1891, ' Maltese Foss. Ech.' Trans. Roy. 

 Soc. Edin. vol. xxxvi, pt. iii, No. 22, p. 598 & pi. i, figs. 11 «-ll c. 



An echinoid (Cy 48) from Birlibah raises the question of 

 the relations of the genera Heteroclypeus and Gonoclypeus to the 

 Echinolampads. This specimen has most of the base broken away ; 

 but the upper surface is well-preserved, and the chief characters of 

 the peristome can be recognized. It belongs to the Maltese species 

 founded in 1891, under the name of Heteroclypeus hemisphericus, 



1 G. C. Laube, ' Beitr. Kennt. Ech. Vic. Tert.' Denkschr. K. Akad. Wissensch. 

 Wien, vol. xxix, pt, ii (1868) p. 25 & pi. v, figs. 2a-2b. 



2 T. Fuchs, ' Beitr. Kennt. Mice. ./Egypt,' Palasontographica, vol. xxx, pt. 1 

 (1883) pp. 45, 63 & pi. xiv (ix), figs. 5-8. 



