249 Guppy Reprint ioi 



Page 1S0 



Fig. 10. Nucula schomburgki, right valve, exterior. 

 " 11. " vieta, right valve, magnified. 

 " 12. " baccata, left valve, interior. 

 "13. " Periplorna orbicularis, left valve, interior. 

 " 14. Lithodomus bipenniferus, right valve, interior. 

 "14a" " exterior. 



" 15. Hyalea ventricosa ; a lower valve, b upper valve. 

 "16. " digitata ; a upper valve, b lower valve. 

 l< 17. Purpura trinitatensis. 

 4 4 18. Metula lintea. 

 " 19. Pleurotoma miranda. 

 [N.B. — The figures are all of the natural size, except where it is 

 otherwise specified.] 



PAPER No. 9 



ON A HETEROCERCAL FISH FOUND IN THE BLUE 

 LIMESTONE SERIES OF THE LA VENTILLE HILLS. 



Read before the Scientific Association of Trinidad, Nov. 

 20, 1878 and published in the "Proceedings", vol. 2, pp. 

 180- 18 1, with plate 8. 



In a paper on the Blue L,iinestone of the Laventille Hills 

 (Proc. Scient. Assoc. Trin., 1877, p. 109), I referred to the 

 discovery of a fish in one of the beds of the series. I had 

 not then seen the specimen, but it has since come into my 

 possession, and is now exhibited to the Association. It con- 

 sists of part of the vertebral column with the tail-fin of a 

 heterocercal fish. There are about thirty vertebrae present, 

 and the rays of the tail are about fifteen in number. There 

 are traces of fine needle-like spines extending backward from 

 the vertebrae near the tail. The length of the specimen is 

 nearly six inches (15 centimetres); the anterior portion is 

 nearly straight, the posterior part slightly curved. The 

 thickness of the stoutest vertebrae is 5 millimetres ; they 

 are nearly all of the same dimensions up to the origin of 

 the caudal fin, whence they rapidly taper off to its extremity. 



The specimen came from the Piccadilly quarry on the east 

 side of Portof Spain. It is exposed on the surface of a thin 



