_ Mr. C. Spence Bate on the Genus Caradina. 27 
that either he has erroneously figured the common Shrimp (C. 
vulgaris), or the common Shrimp of the Irish coasts differs from 
the edible Shrimp of the English markets. 
~ The small and delicate second pair of pereiopoda that Prof. 
Bell has described as being “nearly as long as the third,” and 
figures rather shorter than the first pair, Dr. Kimahan has figured 
as long again as the first pair: the animal is also drawn more 
slender generally than is the common Shrimp. Neither can we 
see the desirability or convenience of the generic separation of 
those species that possess the second pair of pereiopoda short, 
from those that have the same appendages of somewhat greater 
length. 
Caradina. 
In adding this genus for the first time to the list of the British 
Crustacea, we do so merely in words, since it has, we believe, 
been long known under the name of Hippolyte varians of Leach. 
It is remarkable that this species should have so long remained 
misinterpreted, since it is recorded as abundant along the south 
coast of England, from Cornwall to Poole Harbour, as well as 
having been found extensively round the Irish coast. 
Though the colour of the animal generally is a pale transpa- 
rent green, having a darker line along the prima via, we have 
not unfrequently taken it of a deep claret-red. This variation 
in colour 1 am inclined to believe is due to the weed on which 
it has been recently feeding; for indubitably the colouring- 
matter is due to the fluids in circulation, and not to any pig- 
ment existing in the dermal tissues. It is probably from this 
variability of colour that the species has received its distinguish- 
ing name. We have occasionally taken this species when 
dredging at Plymouth, but never so abundantly as of late, in 
rather deeper water just outside the breakwater. 
We _ had previously observed the pecuhar robust-looking 
first pair of pereiopoda; but it was not until very recently that 
we discovered they had the structure which has been described 
as the character of the genus Caradina, in which the propodos 
articulates with the carpus, not centrally, but at the infero- 
anterior angle, and thus appears as a partially dislocated joint. 
There is a second form, that appears to us to be specifically 
distinct from the preceding. It is more slender generally, and 
has the rostrum long and narrow, having two teeth above, one 
near the base, flanked by a lateral tooth on each side just above 
the orbit, and one near the apical extremity of the rostrum, 
which corresponds with one on the under side immediately be- 
neath it; and in one specimen we saw a second tooth also, pos- 
terior to this last. To this species we give the name of 
