294: DR. J. W. GREGORY ON THE PALEONTOLOGY [Aug.. 1 89 5, 



corresponding deposits in Barbados. Prof. Crosby, moreover, most 

 generously gave me samples of the three principal varieties. Sections 

 were subsequently prepared from these, and my guess as to their 

 character was fully confirmed. They proved to be typical, pure 

 oceanic oozes. This fact was announced in the discussion on 

 Messrs. Jukes-Browne and Harrison's paper on Barbados. 1 At 

 that time I had not succeeded in isolating the radiolaria so as to be 

 able to identify the species. This, however, has now been kindly 

 done by Mr. W. Murton Holmes, whose skill in mounting micro- 

 scopic objects of this sort is well known. I must express to him 

 my indebtedness for the time which he devoted to this task. 



The accompanying list of radiolaria from these Cuban marls is very 

 incomplete. It could easily be doubled by a more detailed exami- 

 nation of the slides. It is, however, sufficient for its purpose. All 

 the species in the list are also found in Barbados. The common 

 and conspicuous species are the same in both faunas. Some rarer 

 forms have not apparently been recorded from Barbados, but every 

 one agrees that the list of species from that island is still very im- 

 perfect. Until the Barbados fauna has been better worked out, the 

 discovery of many species from Cuba, not recorded in it, would prove 

 nothing. 



The exact locality at which the Cuban radiolarian marls were 

 collected is at Baragoa, on the north side of the extreme eastern 

 end of the island. Mr. E. T. Hill 2 has recently described the 

 geology of this area. He describes a series of siliceous and argil- 

 laceous beds with radiolaria along the coast at Baracoa, and says 

 that they probably underlie the ' yellow beds ; ' 3 these latter con- 

 tain many fossils, which enable him to identify them as Miocene. 

 No doubt these siliceous beds are the radiolarian marls. Hill says 

 that they are vertical and contorted, and are 500 feet in thickness. 

 His description of the field-relations of these beds is not as detailed 

 as one could wish, and leaves room for a little doubt as to their 

 exact mode of occurrence. Mr. Hill's remark 4 that there is no 

 evidence of subsidence after the beginning of the Tertiary is also 

 rather puzzling, unless it be a verbal misprint. Nevertheless it 

 appears probable that the marls occur interstratified with Miocene 

 limestones, and are in places overlain unconformably by the Pleisto- 

 cene coral-reefs. 



List of the Radiolaria. 



The following list contains only a small proportion of the species 

 in the collection. The 33 species determined are, however, sufficient 

 to prove the practical identity of the faunas, for they belong to the 

 five suborders Sphjeroidea, Prunoidea, Discoidea, Spyroidea, and 

 Cyrtoidea, and represent 17 families and 25 genera. The list there- 



1 Quart. Journ. Geol. Soc. vol. xlviii. (1892) p. 226. 



2 E. T. Hill, ' Notes on the Tertiary and later History of the Island of Cuba, 

 Amer. Journ. Sci. ser. 3, vol. xlviii. (1894) pp. 196-212. 



• Ibid. pp. 199-200. 4 Ibid. p. 210. 



