444 B. Bullen Newton — An Echinoid from Sinai. 



Africana and E. olisiponensis, is of Upper Cenoraanian age. In fact, 

 no Lower Cenoraanian fossils have been recognizee! in the collection 

 of the Geological Survey of Egypt, and, moi'eovei", several of the 

 species are found to pass up into the Turonian stage in other 

 countries, as Dr. Choffat ' has proved in connection with his researches 

 in Portugal. 



In conclusion, therefore, it is hoped that this note may claim the 

 attention of the palaeontologists of Egypt, and that Linthia ohlonga 

 may take its place in all future fauuistic lists connected with the 

 pala3ontology of Sinai. 



I am indebted to my colleague, Dr. F. A. Bather, of the British 

 Museum, for some useful suggestions during tlie preparation of 

 this paper, 



Linthia oblonga, Oibigny. 



I'eriaster ohiongus, Orbigny: " Pal. Francjaise Terr. Cretaces Echinodermes," 1856, 

 ])1. 900, pp. 275, 276. P. M. Duncan, " Xote on tlie Echiuodermata, etc., 

 from the Cretaceous Rocks of Sinai": Quart. Journ. Geol. Soc, vol. xxv 

 (1869), pp. 44-46 (no figure or description). 



Linthia ohlonga, Cotteau, Perou, & Gauthier : "E'chinides Foss. Algeria," vol. ii 

 (1879), fasc. 6, p. 75 (not figured). Fourtau, "Revision E'cMnides Foss. 

 E'gypte": Mem. Instit. E'gyptien, vol. iii (1889), fasc. 8, pp. 631, 632 

 (not figiu'ed). 



The test measurements of the three specimens selected for 

 ■illustration are as follows : — 



(9004) (9003) (Svt) 



Length 31 28 30 mm. 



"Width 27 21 27 mm. 



Height 20 18 19 mm. 



Nos. 9003 and 9004 represent Duncan's two principal specimens, 

 and S-A-is one of the Wadi Budra examples collected by Mr. T. 

 Barron. All these are of the average size, althougli larger and even 

 smaller ones are among the specimens of the Egyptian Survey 

 Collection. The details of structure, so amply given in the original 

 description, are well seen, although in the majority of the specimens 

 it is not always possible to trace the lateral fascicle and its course 

 beneath the anal aperture. This feature is, however, preserved in 

 specimens represented by Figs. 4 (=S-ri-) and 6 (=9003). The 

 structure of the pores, as observed in the anterior ambulacrum (PL XV, 

 Fig. 8) and in the antero-lateral ambulacra (PI. XV, Fig. 7), corre- 

 sponds witli that figured by d'Orbigny. The largest of Duncan's 

 specimens (Fig. 1 = 9004) shows well-preserved ajjical characters, 

 whilst the pores of the madreporite ai-e observable on some eroded 

 specimensobtainedbyMr. BaiTon from the topof JebelSafariah (S4-2-). 



The apex is anterior or nearly central in this species, altliough 

 the abactinal views of the specimens selected for figuring present 

 the idea of great eccentricity, a feature which has been brought 

 about through slightly tilting the specimens so as to include the 

 anal orifice. It is noticeable also that the right anterior corner of 

 some of the specimens appears to be slightly higher than the left, 



1 Choffat, Paul : ' ' Recueil de Monographies Stratigraphiques sur le Systeme 

 Cretacique du Portugal," 1900. 



