452 



APPENDIX H. 



plain in which we found no fossils. In connection with the 

 occurrence of these Tertiary beds at Saffi, I must refer to MM. 

 Desquin and Mourlon's observations in the neighbourhood of 

 Mazagan to the north-west, near which, at a place called Sidi 

 Moussa, calcareous tufas associated with flints occur, containing 



Rotuloi(^ea Jlmbriata, Etheridge. 



1. Dorsal aspect, showing the twelve flmbriations, subpetaloid ambulacra and central 



madreporic tubercle. 



2. Yentral aspect, showing mouth, position of vent, and ramifying furrows 



3. Posterior border and height of test. 



4. Apical disk, with the madreporic tubercle, the four genital pores, and place of the 



five oculars. 



iSolen, Venus, Modiola, Cardium, ifec. ; the deposit in its main 

 characters resembling the description given by M. Coquand of 

 the fluvio-marine travertines of the north of Marocco and also 

 the Sahara beds described by M. VUle ; with the difference that 

 the Sahara deposits are characterised by the presence of little 

 Paludinas, whilst those of Sidi Moussa are full of vermiculiform 



