286 Mr. Westwoop on Diopsis, 
To these may be added, from the Brachyurous family, Ocypodide, Westw., 
or Crabes quadrilatéres of Latreille; the British genus Gonoplax, Cancer an- 
gulatus, Linn.; the American genus Gelasimus, and the New Holland one of 
Macrophthalmus, Latr. (Règne Anim., 2nd edit., vol.iv. p.44.); in all of which the 
footstalks are disproportionately long: but the greatest elongation in the Bra- 
chyura takes place in the genus Podophthalmus, Latr. (Portunus Vigil, Fab., Isle 
of France), belonging to the family Canceridee, Westw. (Crabes nageurs, Latr.). 
The order Macrura does not present any remarkable development in the 
length of the ocular peduncles in any species with which I am acquainted ; 
but in the next order, Stomapoda*, two tropical genera, Lucifer and Podopsis, 
have recently been described and figured by Mr. Thompson in his “ Zoological 
Researches," remarkable not only for the great length of the peduncles, but 
also for the attenuated vermiform shape of their bodies and their luminous 
properties. To these I have added another, nearly allied, with equally long 
footstalks, under the name of Stylophthalma, founded upon a curious species 
figured by Slabber. The only instance which occurs of pedunculated moveable 
eyes in the great Crustaceous division of Entomostraca, is found in the three 
genera forming the order Branchiopoda. In the class Arachnida I have recently 
characterized a spider from Malabar under the name of Phoroncidia aculeata, in 
which the front of the cephalothorax is produced in front into a thick footstalk, 
at the extremity of which the eight eyes are placed (Zool. Journ. No.20.). It is 
nearly allied to the cancriform Zpeirc-]-. (Acrosoma, Perty, Dil. An., art. Braz.) 
This representative structure, moreover, is not confined to annulose animals, 
since it exists in other remote groups, and even amongst the higher animals, 
as though, amongst the Vertebrata,—to use the language of a fanciful Ger- 
man author,—the Squalus Zygana of Linnzus had shot through the waves 
and landed in Java or Brazil transformed into a Dipterous insect; whilst 
everybody is aware that amongst the Tesfacea the eyes of the Snails are 
placed at the extremity of long retractile footstalks. 
* The number of remarkable and analogical forms contained in this group appears to me to be con- 
clusive evidence of its rank as an order, although Mr. MacLeay, following Dr. Leach, is of a different 
opinion. | 
+ The Epeira curvicauda of Vauthier, described in the Annales des Sciences Naturelles, has the two 
lateral eyes on each side placed at the extremity of a short common footstalk. 
