560 G. C. Crklx — " Naufilus cUtellarhis." 



EXPLANATION OF PLATE XXII. 



Fig. 1. — Capiluna IRnppeUi, var. Barroni (var. nov.). Kas Gharib. Front \dew of 



specimen, showing the elongate perforation. 

 Fig. 2. — Lateral aspect of same specimen. 



Fig. 3. — Internal view of same shell, showing a nearly circular basal margin. 

 Fig. 4. — Details of external sculpture, magnified. 

 Fig. 5. — Alectryonia, allied to crista-gaM, Linnseus. North of Kosseir. Fractured 



view of specimen, with parts of both valves attached, exposing the 



ligamental area. 

 Fig. 6. — Another aspect of the same shell. 

 Fig. 7. — Pecte7i Vasseh', Fuchs. Northern Wadi Gueh, Camp 6, 240 feet above 



sea. External view of a lower valve- 

 Fig. 8. — Fecten Vasseli, Fuchs. Upper coral terrace between Nebk and Sherm, 



S.E. Sinai. External view of an upper valve belonging to another 



specimen. 

 Fig. 9. — Fecten Vasseli, Fuchs. Magnification of external sculptui-e. 

 Fig. 10. — Chlamys Eeissi, Bronn. North of Kosseir. External view of a left 



valve with numerous ribs ornamented by thin, transverse, elevated striae. 

 (Except where otherwise mentioned, the figures on all the Plates are drawn 

 natural size.) 



VI. — Note on Epeippioceras clitellarium, J. de C. Sowerby, sp., 



AND E. COSTATUM, A. H, FoORD. 

 By G. C. Crick, F.G.S., of the British Museum (Natural History). 



THE name Nautilus clitellarius was given by J. de C. Sowerby ^ to 

 a Nautiloid from the Coal-measures, Coalbrookdale, Shropshire, 

 and the description was accompanied by three figures, each repre- 

 senting a different specimen. In 1884^ the species was included 

 by Professor Hyatt in his new genus EjpMpjpioceras. In 1891 

 Dr. A. H. Foord ^ found a new species, EpMppioceras costatum, 

 which was said to be " distinguished from E. clitellarium (to which 

 it is, however, very closely related) by the character of the septa 

 and by the surface ornaments. The septa in E. costatum do not 

 form such an acute lobe upon the periphery as do those of 

 E. clitellarium, and they are also a little wider apart in the former 

 species than thej' are in the latter. Moreover, E. costatum is provided 

 with prominent transverse costas, which are strongest upon the sides 

 of the shell where they swell out into heavy folds. These cost^ are 

 directed obliquely backwards, and cross the septa at an acute angle, 

 passing across the periphery and forming a shallow sinus in the 

 middle. None of the specimens in the British Museum have the 

 test preserved, so that the ribbing has only been observed upon 

 casts. The costee are equally well developed upon the body-chamber 

 and upon the septate part of the shell in the adult, but they were either 

 very feeble or altogether absent in the young." A re-examination 

 of the specimens in the Museum collection shows that the separation 

 of the two forms is quite justifiable. 



Since Dr. Foord's species was instituted the British Museum 

 collection has been enriched by the addition of two of Sowerby 's 

 figured specimens, viz., the originals of his figs. 5a and 5&. 



1 Trans. Geol. Soc, vol. v, pt. 3 (1840), expl. of plates, etc., pi. xl, figs. 5, 5fl, b. 

 - Proc. Boston Soc. Nat. Hist., vol. xxii (1884), p. 290. 

 3 Cat. Foss. Ceph. Brit. Mus., vol. ii (1891), p. 103. 



