CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 107 



" Each minute point forming the pectinate border to the several ridges has a 

 small indented pit near its extremity, which has suggested the specific name 

 porifera. It is to be hoped, however, that more perfect specimens will reward the 

 zealous labors of Mr. Guppy, as the determination of species, offering such meagre 

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

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



Type locality, San Fernando beds, Trinidad. Later the species was found 

 at St. Bart's. 90 



Remarks. — Woodward adds to his interesting description that in spite of the 

 wide distribution of the genus in the old world ten species only are known to him. 

 These range from the Eocene to the recent period. 



The specimen now under consideration was collected by Mr. Arthur C. Veatch 

 at Farallon Rock, off San Fernando, in the Gulf of Paria. Under a lens the 

 minute pores characteristic of the species bordering the pectinated ridges of 

 t lie carapace show most beautifully, and leave no doubt that this and the San Fer- 

 nando specimen are the same species. 



On Farallon Rock Ranina porifera is associated with masses of Foraminifera, 

 with echinoderms and with the curious spiral worm tube, Serpula clymenioides 

 first described by Dr. Guppy from the San Fernando beds. Thus the fauna of 

 Farallon Rock and San Fernando have much in common. This is quite sur- 

 prising, as, though the localities are not distant from one another , the lithologi cal 

 characters of the beds are wholly different. The San Fernando beds are black 

 and highly asphaltic, while those of Farallon Rock in which these fossils occur 

 are a fine yellowish grey sandy marl. 



Locality.— Farallon Rock (also called Johnson's Island), near San Fernando, 

 Trinidad, in the Gulf of Paria. 



Geological horizon. — Lower Oligocene. Approximately equivalent to the San 

 Fernando beds, and probably to the Vicksburgian of Mississippi. 



Class ECHINOIDEA. 



is ECHINOLAMPAS G 



ovumserpentis 



Echinolatnpas ovumserpentis Guppy, Quart. Jour. Geol. Soc. London, vol. XXII, p. 300, pi. XIX, 

 ngs. 4-6, 1866. 



Echinolampas ovumserpentis Guppy, Geol. Mag., p. 444, 1874. 



Guppy 7 s original description— "Test oval, subcylindrical or nearly circular, 

 wider behind than before, slightly rostrated anteriorly, and truncate posteriorly, 

 sometimes having a tendency to become polygonal; ambulacra raised, petaloid, 

 open at the ends, extending nearly to the tumid margins, the pores connected by 

 an oblique groove; base convex, except towards the mouth, where it becomes 

 somewhat concave; dorsum rather evenly convex; ambulacral summit sub- 



; anus small, circular, situate between the peristome and the margin, 

 much nearer to the latter than the former. 



• Guppy, Geol. Mag., p. 443, 1874. 



central 



