BRITISH STALK-EYED CRUSTACEA. 455 
extend this plan to all specimens of the rarer continental species 
in Britain, the meteorological data, and a corresponding map of 
Europe, showing the northward range of these birds in the 
breeding season. We ourselves have not time to devote earnestly 
to this additional work, but we believe that the field suggested 
would be sure to yield to any naturalist taking it up as a separate 
branch, a rich harvest in course of time. 
NOTES AND OBSERVATIONS ON BRITISH 
STALK-EYED CRUSTACEA. 
By Joun T. Carrineton, F.L.S., anp Epwarp Lovert. 
(Continued from p. 418.) 
Genus Xantuo, Leach. 
We now take a final leave of the “Spiders,” or triangular- 
shaped crabs, and come to the ordinary or true crab-shaped 
form. The first of these genera, taken in the classification hitherto 
followed, is Xantho, Leach. The chief generic characters are 
a broad, slightly convex, and somewhat wrinkled carapace, massive 
and hard in its structure; orbits slight; legs short and stoutly 
built, especially the anterior pair, which are very broad and large ; 
external antenne very short. Male abdominal segments five in 
number, female seven, and as usual broader than those of the 
male. 
Xantho florida, Leach. 
This interesting crab is usually about two inches broad 
and an inch to an inch and a half long; specimens, however, 
occasionally exceed these dimensions. The whole of the exo- 
skeleton, as we have noticed in the generic description, is of a 
powerful and massive nature, and when we come to look into the 
habits of the animal this is well accounted for. This crab not 
only loves to live under large stones and rock masses, but we have 
frequently observed it in numbers safely ensconced in rocky clefts, 
into which it forces itself, and from which it is difficult to dislodge 
it. In fact, its habits in this respect would be quite unadapted 
to a crustacean with a more delicate carapace. 
In the younger state the carapace and legs are very much 
more wrinkled than they are in the full-grown animal. They are, 
