54: Mr. R. J. L. Guppy on the Terrestrial and 
band separated by a fine line or groove from the lateral portions 
on each side. 
Lingual teeth about 30.5.0.5.30, broad, subequal: 
central obsolete; first five laterals symmetrical, with a larger 
rounded cusp having a smaller cusp of similar shape on each 
side ; outer laterals bicuspid, resembling the teeth of Testacedlus. 
Conulus vacans lives on epiphytal orchids, and also on the 
roots and stems of ferns. It is viviparous; and in the wet sea- 
son individuals are found containing ten or twelve young, in 
different stages. When excluded, the young shell has two 
whorls, and is about one-tenth of the diameter of the full-grown 
shell. 
Anopon, Cuvier. 
Anodon Leotaudi, n. sp. 
Shell transverse, oval-oblong, very inequilateral, somewhat folded 
posteriorly, striated by numerous concentric lines of growth, 
which become rather subrugose towards the margins, and 
which are crossed by numerous inconspicuous radiating striz ; 
valves moderately thick; umbones somewhat tumid; epi- 
dermis shining, dark olive-brown, passing into black; hinge- 
line long, slightly curved and forming an angle with the 
rounded anterior end; posterior end with a steep oblique 
slope, scarcely truncate; interior brilliantly iridescent, m- 
clining to rose-colour. Length 3:3 inches, height 1°8 inch, 
thickness 1:2 inch; length of hinge-line 2°3 inches. 
The nearest species to this is perhaps 4. amazonensis, Lea*, 
from which this species may be distinguished by its longer 
hinge-line, its steeper posterior slope, and the more abrupt 
angle formed by the hinge-line with the anterior end. Similar 
characters separate it from 4. ¢rigena, Spix, than which it is 
more transverse. 
I have much pleasure in dedicating this shell to my friend 
Dr. Leotaud, the learned ornithologist of Trinidad, in acknow- 
ledgment of his having presented me with the first example I 
had seen of the species. 
Cyclostomus citrinus, Sow., is recorded as a Trinidad shell. I 
have never found any mollusk answering to the description of 
that species; and I should not be surprised if the true habitat 
turned out to be Trinidad de Cuba. 
Helix perplexa, Fév. (H. granifera, Gray). This is stated to 
be a Trinidad species; but I believe the true locality to be 
Grenada. 
Helix discolor, Fé. Also reported as a Trinidad species ; but 
I have not found it in the island. Of H. Jsabella, Fér., 1 once 
* Observations on Unio, &c. vol. x. pl. 46. 
