646 ME. R. B.NEWTON ON [Nov. I9H, 



which is succeeded below by a prominent notch or excavation ; 

 the valve is moderately convex, with gentry sloping sides. 



Dimensions : — Length = 38 millimetres ; height =55 mm. 



In contour and size this valve resembles Vulsella eymari of 

 Dr. Oppenheim, from the Libyan Eocene deposits of Egypt, and its 

 affinities are probably with that species. If such is the case, then 

 it must be assumed that the prominent concentric laminae distin- 

 guishing Oppenheinxs specimen must have disappeared through 

 weathering or otherwise. Both forms exhibit the anterior projec- 

 tion of the cardinal area, but the margin below forms more of a 

 notch in the present shell, than a continuous excavation as in the 

 example from Egypt. This extension of the hinge-area and the 

 presence of the notch are apparently not seen in recent examples 

 of the genus, and although suggestive of byssal characters, it is 

 stated in Fischer's ' Manuel ' that Vulsella has no byssal organ. 



Occurrence. — A cream-coloured limestone weathering reddish 

 is the associated matrix ; well-preserved Nummulites are present. 



Locality. — East of Slonta. 



Spondylus sp. 



Remarks. — This specimen is of rather small size, and in a 

 worn and cracked condition. It possesses both valves in the closed 

 state, with an imperfect dorsal area showing only the incurved 

 umbones without indication of hinge-expansions. In general form 

 having a greater length than height, it assumes much the contour of 

 some examples of S_p. rouaulti D'Archiac, 1 from the Indian Eocene, 

 but differs from that species in sculpture by possessing a more 

 uniform costal system in which the ribs are of one order throughout. 

 These costae are numerous (about thirty), fine, rounded, and divided 

 by grooves which, in the ventral direction, are nearly twice their 

 width, but are much narrower over the umbonal region. On the 

 summits of the costae there appear to be occasional minute asperities 

 which, however, are very obscure. No transverse striations are 

 observable in the sulcations, such as characterize Sp. rouaulti. 



Dimensions: — Length = 32 millimetres; height = 27 mm.; 

 diameter = 15 mm. 



Occurrence. — In a cream-coloured marly limestone weathering 

 to a straw-colour; no Nummulites distinguishable. 



Locality. — North of Slonta. 



Trachycarditjm cf. granconense Oppenheim. 



Cardium (Trachycardium) granconense Oppenheim, Zeitschr. Deutsch. Geol. 

 Gesellsch. 1896, vol. xlviii, pi. iv, fig. 14 & p. 94, and Palaeontographica. 1901, 

 vol. xlvii, p. 164. 



Remarks. — This form consists of a single left valve in lime- 

 stone, well inflated, of equal length and height, possessing 

 numerous costae and grooves which are furnished with a minute 



1 'Descr. Anim. Foss. Nummulit. Incle ' vol. ii (1854) p. 272 & pi. xxiv, 



