Guppy Reprint 
143 
291 
tions, thus dividing the back into three parts, the median par 
bearing a single row of distant, low, but acuminate tubercles ; 
and each lateral portion two rows of similar tubercles somewhat 
irregularly arranged. The length of the specimen is about 5 cen- 
timetres by centimetres in extreme width. 
A specimen of Ranina collected bj' me from the Naparima 
rocks was described b}^ my friend Dr. Henry Woodward, F.R.S., 
in 1866, under the name of R. porifera, (Jour. Geol. Soc., Vol. 
XXII, p. 591.) Dr. Woodward gave a list of all the species of 
Ranina then known to him, eleven in number, of which ten were 
fossils from tertiary depo.sits, and the remaining one is a living 
species found in Japanese and Eastern seas. I am not aware of 
any additions having been made to Woodward’s list. I am un- 
able positivelj' to allege that our pre.sent species is different from 
that described by Woodward, inasmuch as in the latter the super- 
ficial characters of the Carapace are preserved whereas in the 
present specimen the shell has disappeared. R. porifera also 
lacks the frontal margin so that we do not know what the form 
Page 56 
of it was, while in R. cuspidata the frontal margin is almost per- 
fect. Further, the dorsal surface of R. porifera is free from 
tubercles. 
The occurrence of Ranina in the tertiar)- rocks of Trinidad 
is another fact to be added to tho.se noticed in ni\" Paper on the 
“Geological Connexions of the Caribean Region,’’ showing the 
probable connexion bj' .sea between the Caribean Sea and the 
Pacific Ocean at a former epoch. 
The concentricallj'-ribbed bivalve referred to in the forego- 
ing Paper is probably Ve?tus blandiana, Gupp}’, (Proc. S. A. 
Trill., 1873, page 85. PI. II, F. 8 ; Geol. Mag. 1874. PI. XVII, 
F. 8). It is said by Dali, Florida Fossils, Part VI. page 1277) to 
be like his Cytherea strigilina, but I do not know that species. 
It is like V. versatilis, Dolf., Faluns of Touraine (Journ. Conch. 
1888, PI. XII. F. 4). 
