Vol. 67.] THE FOSSIL ECHINOIDEA OF CIRENAICA. 675 



Distribution. — In a yellow-weathering, marly limestone, near 

 the Fountain of Apollo at Cyrene ; and at Gasr el Harib, near Derna. 

 Age, Aquitanian. 



Cy 100. Type-specimen. 150 feet below camp at Ain Sciahat. 



Cy 264. Broken specimen. Plateau above camp at Ain Sciahat. 



Cy 102. Broken and crushed specimen. Plateau above camp at Ain Sciahat. 



Cy 126. Young specimen, 37'5 mm. long and 38 mm. wide (slightly crushed). 



Camp at Ain Sciahat. 

 Cy 24. Flat crushed specimen, in soft yellow limestone. Plateau at Grasr el 



Harib, east of Derna. 



Affinities. — In the field — trusting only to memory of the 

 species — I identified this echinoid as Sch. desori, the Aquitauian- 

 Langhian species from Malta. On studying the collection after my 

 return, I at once compared it with the Priabonian Sch. rimosus Ag. 

 The dimensions, as shown by the table quoted above, seemed to me 

 to indicate that the affinities of the species are nearer to Sch. desori. 

 M. Lambert, however, who has kindly examined the best specimen, 

 regards it as nearer Sch. rimosus, though distinct from that species, 

 than it is to Sch. desori, from which he says it is ' bien different.' It 

 certainly is nearer to rimosus in some features of its shape. From 

 both these species the Cyrenaican Schizaster differs by its greater 

 breadth, which is slightly more than the length. 



The granulation of the plates in the anterior am bulacral furrow of 

 Sch. rimosus, according to Cotteau's figure ('Ech. Eoc, Pal. Franc,. : 

 Terr. Tert.' pi. c, fig. 5), consists of sparse irregularly scattered 

 granules, whereas in this species the granules are crowded and 

 arranged in irregular longitudinal rows. The antero-lateral petals 

 appear to me shorter, straighter, and broader than in Sch. rimosus, 

 though the numbers of the pores in the paired petals of rimosus (31), 

 desori (30), and ederi (30) are practically the same. 



M. Lambert remarks about the species that 



' S. rimosus Desor, du Tongrien de Biarritz, est voisin. maisnon identique. Le 

 sillon entame davantage le bord chez le Schizaster de la Cyrenaique ; son 

 peristome est plus excentrique, son fasciole est plus coude. Ce Schizaster 

 consume probablement une espece nouvelle.' 



Schizaster ederi may be regarded as a form tending to link 

 Sch. desori and Sch. rimosus. 



Sabsklla lamberti, 1 sp. nov. (PI. XLVIII, figs. 3 a & 3 b.) 



Diagnosis. — Test small, heart-shaped, with a broad shallow 

 anterior notch. The breadth of the test is equal to the length. 

 The greatest width is at about two-fifths of the length from the 

 anterior end. The posterior end is truncate, and the straight side 

 there helps to impart to the test a somewhat hexagonal outline. 



The test appears flat when seen from the side ; the sides slope 

 gently down from the low median ridge. The anterior margin is 



1 Named after M. Jules Lambert, President of the Civil Tribunal, Troyes, 

 the distinguished authority on the Kainozoic Echinoids of the Mediterranean 

 Basin. 



