On some Pleurodiran Cheloaians from Eyypt. 115 



pa]p, and in having the spine of the palpal organ slender 

 and subfiliform. 



The Museum is indebted to Dr. A. Dug^? for the specimen 

 here referred to M. Breyeri^ Becker (Ann. Soc. Ent. Belg. 

 xxi. p. 77, pi. ii. figs. 1-6, 1878), from Guanajuato, the 

 original and only known locality for the species. 



The males of the species of Metriopelma represented in the 

 British Museum may be tabulated as follows : — • 



a. Eyes of anterior line strongly procurved, posterior edge 



of laterals far in advance of centres of medians; palpus 

 short, not extending beyond distal end of patella of 

 first leg auronitens, 



b. Eyes of anterior line less strongly procurved, posterior 



edge of laterals at most a little in advance of the 

 centres of the medians ; palp surpassing patella of first 

 leg. 

 a}. Palp very long, twice as long as carapace and extend- 

 ing as far as apex of tibia of first leg Breyeri. 



b\ Palp short, less than twice the length of carapace, 

 and not surpassing middle of tibia of first leg. 

 a^. Tibia of palp longer and thicker than patella of 

 first leg; weakly spined internally, but spined 



above at apex veh.v, 



6*. Tibia of palp not longer and thicker than patella of 

 first leg ; strongly spined internally, but not above 

 at apex. 

 a3. Tibia of palp with about a dozen spines, of first 



leg with about fifteen spines tetricum. 



¥. Tibia of palp with about twenty-three spines, of 



first leg with about twenty-five spines trinitatis. 



XIV. — On some Pleurodiran Chelonians from the Eocene of 

 the Fayum, Egypt. By C. W. ANDREWS, D.Sc, F.G.S. 

 (British Museum, Natural History). 



[Plates VII. & VIII.] 



In the present paper I propose to give a short account of 

 some Pleurodiran Chelonians collected from the Middle and 

 Upper Eocene beds in the Fayum during the last two seasons. 

 One member of the group, Stereogenys Cromeri, has already 

 been described, but from the skull only, and a description of 

 the carapace and plastron probably belonging to that species 

 is given below. 



Stereogenys libyca, sp. n. (PI. VII.) 



One of the finest specimens collected during my expedition 

 to the Fayum in the spring of the present year (1902) is a 



8* 



