KIVER-PEAWNS. 
85 
Some interesting Crustacea are also found in Blue- 
fields rivulet. I obtained in some numbers a new 
Atya which has been since described by Mr. New- 
port under the name of occidentalism and a new Palce- 
mon, named in the List of the Crustacea in the 
British Museum, P, Procles. Besides these, a Prawn 
of large size is common, provincially known as the 
Crayfish (P. Jamaicensis). Specimens are often 
found seven inches in length, independent of the 
claws, one of which is sometimes enormously de- 
veloped, while the other remains of the usual size. 
They are frequently seen from the banks, darting 
with the swiftness of an arrow, tail foremost, from the 
shelter of one stone to that of another ; and, as their 
flesh is esteemed, they are much sought after. The 
most common mode of capturing them is by a small 
fish-pot, or lengthened basket made on the principle 
of a wire mouse-trap, admitting the entrance, but re- 
fusing the exit of the prawn. I procured a good 
many specimens of these and other Crustacea, by 
means of this device. 
In the hollows of the limestone-rock beneath the 
waterfall, and at either side of it, subject to a con- 
tinual dripping, where the calcareous matter with 
has an upward direction. There are thirty-one scales in a straight 
line, from the gill-aperture to the base of the caudal ; and three more 
upon the caudal ; there are nine in transverse series at the vent. 
The irides are green, brilliantly iridescent. The body almost pel- 
lucid ; olive above ; the sides pearly, with rich amethystine reflections ; 
green and golden hues prevail on the cheeks and gill covers ; a black 
band, rising from the upper side of the base of the pectoral, runs along 
the side about one third of the length : the dorsal and caudal are 
edged with blackish. Length to two inches. (Plate I. fig. 3.) 
