Bulletin 35 
334 
186 
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 certain!}" a fault or merely a fold. There isusuall}- crush- 
ing and displacement accompanied b}' disintegration especially 
along synclinal or anticlinal lines. The intimate relation of fault- 
ing and folding is shown by Mellard Reade in the Geological 
Magazme for 1896, page 353. 
Owing to the kindness of M. Morris I .secured from the 
Springvale Quarry an example of Cypy'cza henekeni, a species dis- 
co\"ered 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 Sawkius. The material supplied me 
by Mr. Raspass contains moll uskan fossils as well as the character- 
istic Foraminifer Planorbulina larvata. I give the names of some 
of these, but there are many more species. 
The Foraminifer Planorbulbia 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 t3"pe 
of foraminifera is altogether extinct : while the Planorbulina, 
w"hich is an extreme cyclical development of the type exemplified 
by PI. mediteranensis and PI. vulgaris is only found in the living 
state in the Pacific and Indian seas. 
Page 4 
The tube-shell 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 b\" me Ditrupa, was afterwards determined 
to be a Mollusk. It was described as Cadulus pariatius 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 
