64 
The family of Brachyures is again divided into, 
OXYRHYNCHS, the carapace slender in front, and length- 
ened, the orbits looking downward, branchial organs much 
developed. 
CYCLOMETOPS, the carapace large, regularly arched in 
front, more slender behind ; the orbits obliquely upward 
or in advance ; brauchias as in the Oxyrhynchs. 
CATOMETOPS, the carapace usually square or eggshaped ; 
front transverse and commonly diminishing; the orbits 
directed forward or down ; branchi® fewer than in the two 
first, but situated alike. 
The family of Oxyrhynchs is again divided into the following 
sub-families, 
MACROPODIANS — the legs slender and very long, the 
second or third pair much longer than the first, and more 
than twice as long as the post-frontal portion of the cara- 
pace. 
MAIANS — tbe'legs of moderate size, the second or third pair 
not commonly twice as long as the post-frontal portion of 
the carapace ; the first pair longer and stouter than the fol- 
lowing, but not more than twice the length of the post-fron- 
tal portion of the carapace. Inferior portion of the external 
antennas well developed, forming the greater part of the 
inferior portion of the orbit. 
PARTHENOPIANS — the four posterior pairs of legs much 
shorter than the first; the second pair less than a length 
and half of the post-frontal portion of the carapace ; the 
first pair stout, at least in the male, and two or three times 
that length. Inferior portion of the antennae usually but 
little developed, and forming a small part of the lower par- 
tition of the orbit. 
MACROPODIANS OR SEA SPIDERS. 
GENUS STENOllRHYNCHUS: the second pair of legs 
much longer than the others; the stalk of the external an- 
tenna inserted before the level of the eyes, of which the 
footstalk is very short. 
SMALLER SEA SPIDER. S. Longirostris, Edwards’ Crus- 
tacea, vol. 1, p. 280. Macropodia Tenuirostris, Leach’s 
Malacostraca, pi. 23. Common at the depth of from 2 to 
20 fathoms, and often taken in crab pots. 
Another Species, S. 1‘ halangium of M. Edwards, p. 279, is 
described as common on the coasts of the channel, but 1 
have not hitherto recognized it as Cornish. It is the Can- 
cer Phalangium of Pennant, Br. Zool. vol. 4, pi. 9, fig. 17, 
and Macropodia P. of Leach’s Malac, pi. 23. 
