i86 



BULLETIN 35 



334 



the minute details of structure or to give the exact propor- 

 tions of the different beds. As regards faults it is rarely easy in 

 the case of the Naparima Rocks to ascertain whether a disloca- 

 tion is certainly a fault or merefy a fold. There is usually crush- 

 ing and displacement accompanied by disintegration especially 

 along synclinal or anticlinal lines. The intimate relation of fault- 

 ing and folding is shown by Mellard Reade in the Geological 

 Magazine for 1896, page 353. 



Owing to the kindness of M. Morris I secured from the 

 Springvale Ouarn- an example of Cypr<za henekeni, a species dis- 

 covered in the Haitian Miocene and not since recorded from any 

 other locality. The species is remarkable fo r the bosses or tuber- 

 cles, which resemble those of C. mus an allied living species. 



The Corosal Road Ditrupabed and the Pointapier Ditrupa- 

 bed have proved to belong to the Upper Miocene series called the 

 Caroni series by Wall and Sawkins. The material supplied me 

 by Mr. Raspass contains molluskan fossils as well as the character- 

 istic Foraminifer Planorbulina la,rvata. I give the names of some 

 of these, but there are many more species. 



The Foraminifer Planorbulina larvata seems to have played 

 in the Caroni Miocene Series a part similar to that of the Or- 

 bitoides in the Eocene formations. Both are extremely abundant 

 in beds whose fauna and constitution denote a moderate depth, 

 say fifty to two hundred fathoms of water. The Orbitoides type 

 of foraminifera is altogether extinct : while the Planorbulina, 

 which is an extreme cyclical development of the type exemplified 

 by PL mediteranensis and PL vulgaris is only found in the living 

 state in the Pacific and Indian seas. 



Page 4 



The tubeshell found abundantly in the Ditrupabed of Point- 

 apier and taken by me in the first instance to be the shell of a 

 worm and hence called by me Ditrupa, was afterwards determined 

 to be a Mollusk. It was described as Cadulus parianus in the 

 Proceedings of the U. S. National Museum (Vol. xix, 1896, Page 

 323, PI. xxx F. 7.) in the Corosal Road Bed a somewhat similar 



