668 PKOF. J. W. GREGOKT ON [Nov. I9II, 



I originally regarded these specimens as young forms of A. arcuata. 

 Dr. Pervinquiere ! has reported an Amphiope with incompletely 

 closed lunules, from the Priabonian of Tunis. 



Amphiope sp. 



The collection also includes a fragment (Cy 82) of an Amphiope 

 with long lunules, from the Aquitanian Pecten Bed at Ain Sciahat. 



Echinoiampas. 



The collection includes a series of specimens of Echinolampas of 

 which the specific determination is difficult, as most of them have 

 been damaged by sand erosion. 



The genus Echinolampas includes a large number of species 

 distinguished mainly by the shape of the test, a character of 

 uncertain value ; and, although the approximate stratigraphical 

 horizon may be safely inferred from a number of specimens, the 

 specific identification of single specimens is usually difficult in this 

 genus. 



The specimens of Echinolampas were mostly found in Central 

 Cyrenaica, and the chief Echinolampas Bed is a well defined horizon. 

 The matrix of most of the specimens contains foraminifera, which 

 Mr. Newton has determined as nummulites ; and Mr. Chapman 

 has identified specimens from this bed as Nummulites gizehensis, 

 var. lyelli. The Echinolampas was never found associated with 

 the Middle Eocene form of N. gizehensis, bu£ with the later smaller 

 varieties. 



It is natural at first to compare the Echinolampas with those 

 from the Egyptian Eocene, which contains many easily recognizable 

 species such as E. osiris, E. africanus, E. crameri, E. globulus, but 

 none of them were found in Cyrenaica. Nine species of Echino- 

 lampas are described by Dr. Oppenheim from the Priabonian beds 

 of Northern Italy ; but the most easily determined of those species, 

 such as the massive E. montevialensis Schaur., or E. beaumonti Ag., 

 are not represented. The most abundant of the Cyrenaican Echino- 

 lampads is a species with a subpentagonal outline, a concave base, 

 and having the summit of the test behind the apical disc. Different 

 varieties are more rounded and oval in plan, or are higher, or have 

 the posterior half of the test more expanded. 



The general practice in regard to this genus is to treat these 

 variations as specific ; but M. Lambert, who has had especial ex- 

 perience of the genus, has kindly examined six of the specimens 

 representing the different forms. He regards them all as individual 

 variations of a single species, which includes also the Upper Eocene 

 Tunisian echinoids originally referred to E.perrieri. He says in a 

 letter : — 



' En resume, sans trancher la question de l'identite de YE. perrieri de la 



1 ' Etude Geologique de la Tunisie Centrale ' Carte Geol. Tunisie, 1903, 

 p. 200. 



