64 



The family of Rrachyures is again divided into, 



OXYRHYNCHS, tlie 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 ; branchiae as in the Oxyrhynchs. 



CATOMETOPS, the carapace usually square or eggshaped ; 

 front transverse and commonly diminishing; the orbits 

 directed forward or down ; branchiae 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 — the" 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 

 antennae 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 poition 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 STENORRHYNCHUS: the second pair of legs 

 much longer than the others; the stalk of the external an- 

 tennas 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. Phalangium of M. Edwards, p. 279, is 

 described as common on the coasts of the channel, but I 

 have not hitherto recognized it as Cornish. It is the Can- 

 cer Phalan-ium of Pennant, Br Zool. vol. 4, pi. 9, fig. 17, 

 and Macropodia P. of Leach's Malac, pi. 23. 



