39 
of a new Irish Crustaceons Animal. 
Fig. 10. One of the hairs greatly magnified. 
Fig. 11. The terminal joints of the palpus, as seen sidewise. 
F’ig. 12. The same seen from behind. 
Fig. 13. The third pair of appendages to the mouth, seen sidewise. 
Fig. 14. The first leg, or last appendage to the mouth, seen laterally. 
Fig. 15. A body, the exact position of which I could not ascertain, but believe 
that in the female it lies between the pair fig. 14., and behind those marked fig. 
13. The minuteness of the animal rendered it impossible to ascertain the point 
clearly. The moment the separation of the parts No. 14. was effected, I found 
this, but could not tell where it came from; it is perhaps basally attached to No. 
14 . 
Fig. 16. One side of the tail and the swimming feet beneath, seen from above. 
Fig. 17. The underside of the terminal joint of the right last foot. 
Fig. 18. The last pair of legs in the male. 
Fig. 19. The last pair cf legs in the female. 
Fig. 20. The apical joint still more magnified. 
Fig. 21. Form of the fourteen minute teeth on the long process. 
Fig. 22. An appendage to the first joint of the tail in a female specimen only ob- 
served on the left side — it may have existed on the other — and is most probably 
a collapsed ovary. 
My friend Mr. Patterson has furnished me with the following 
interesting particulars in a letter which accompanied the specimens. 
“ The sketch I send you is a very rude representation of a small 
Crustacea, five or six specimens of which are sent on a card. The 
drawing has no pretensions to accuracy except so far as the anten- 
nae are concerned, and in these the anomaly of two distinct forms 
made me delineate them with as much accuracy as in my power. 
This difference is not perceptible in all the specimens. The ros- 
trum in the part which is inked (Note. — This refers to the pedun- 
cle of the eye) is a dark blue. The colour of the animal is itself a 
bright green, mottled with darker shadings ; the green colour is very 
fugacious, and observable only in the recent specimens. The an- 
tennae are covered with numerous small hairs. The feet beauti- 
fully fringed and formed for swimming. * * * * The first 
time on which I took any of these was in crossing the ferry, at the 
mouth of Larne Lough, county Antrim, in the evening of the 2nd 
of May. They were so numerous, that in the space of about fif- 
teen minutes above three hundred were taken. Though kept in a 
glass jar of sea-water they all died during night, and were almost 
colourless next morning. The ensuing day I passed the ferry, but 
only took four specimens. These I lost, as well as some of those 
of the previous evening, by having Bcrocs in the same vessel. 
The fact of the Berocs feeding on small Crustacea has been re- 
corded by Fabricius, and at present appears to rest on his autho- 
rity. It was interesting to observe the fact, which I did without 
