592 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [JunO 20, 



In Prof. Eeuss's work (Foss. Krabben der k.-k. Akad. der Wissen- 

 schaften, Wien) these peculiarities are very well shown ; but neither 

 in these nor in the various specimens which I have been able to 

 examine can I detect the same ornamentation as that observable 

 in the Ranina from Trinidad. 



Each minute point forming the pectinated border to the several 

 ridges has a small indented pit near its extremity, which has sug- 

 gested the specific name j^ori/^ra (see Plate XXYI. fig. 18). It is 

 to be hoped, however, that more perfect specimens will reward the 

 zealous labours of Mr. Guppy, as the determination of species upon 

 the evidence of a single fragment, offering such meagre characters 

 as the one now noticed, is by no means safe, except in very pecuhar 

 and well-marked forms, such as the species of the genus Baniaa. 



"With regard to the species nos. 8 and 9 in my list, I am inclined 

 to consider that figured by Prof. Eeuss from the Nummulitic forma- 

 tion of Yicenza and the specimens brought over by Major Baker from 

 Scinde (and now preserved in the British Museum) to be identical. 



The pectination is coarser and stronger than in Ranina porifera, 

 and there are no indented pits at the extremities of the teeth form- 

 ing the transverse serrations on the surface of the carapace. 



I beg, therefore, to propose for these specimens the specific name 

 of Ranina Reussii, in honour of the distinguished Austrian palaeon- 

 tologist who has figured it in his work. 



Note on the Orbitoides and I^fmmulin^ of the Tertiary Asphaltic 

 Bed, Trinidad. By Professor T. Rupert Jones, P.G.S. 



The asphaltic rock yielding Orhitoides and Nummulince in abundance 

 is described in the * Eeport on the Geology of Trinidad' (1860, 

 p. 37), by Messrs. Wall and Sawkins, as a highly inclined bed of 

 bituminous shelly marl, protruding on the coast at San Fernando, 

 on the west side of the island, and forming part of the " Naripima 

 Marl," in the " Newer Parian Group," regarded as being probably 

 Miocene, whilst the " Older Parian," on which it rests, is Neocomian 

 in age. 



In 1863 Mr. R. L. Guppy read a paper descriptive of this pecuhar 

 stratum before the " Scientific Association " in Trinidad, pointing out 

 that its shelly contents are Orbitoides and Nummulites, the former 

 predominating ; and he suggested that in all probability they would 

 be found to be of the same species as those referred to in my '' Note 

 on the Nummulinae and Orbitoides of Jamaica" (Quart. Journ. Geol. 

 Soc. vol. xix. p. 514). This opinion is confirmed by a careful 

 examination of specimens of the asphaltic stratum, with which 

 Mr. Guppy has favoured me. 



Boiled several times in turpentine, this rock loses its bitumen, 

 and resolves itself into loose Orhitoides and Nummulinoi, with a few 

 other Foraminifera, and (when cleaned by acid) a small proportion 

 of green -black sand and very few rounded grains of quartz. On the 

 weathered surfaces of the rock, and in pieces carefully burnt, many 

 perfect Orhitoides may be recognized ; and probably throughout the 



