296 Rev. Dr Fleming's Gleanings of Natural History 
longicornis of Muller (Ent. p. 115. Tab. xix. Tig. 7. 9.), in 
possessing only two tentacuia ; but it differs very remarkably in 
the pair of triarticulated cheliferous hands, and the pair of un- 
guiculated feet which follow. 
2. Proto pedatus. — This is the Gammarus pedatus of Mul- 
ler (Zool. Dan. Tab. ci. Fig 1. 2.), t and the Cancer gammarus 
pedatus of Montagu, (Lin. Trans, vol. xi. p. 6. t. 11. f. 6). 
The four minute appendiculse at the extremity of the posterior 
end, which are figured by Muller, but which Montagu was un- 
able to detect in his specimens, were readily distinguishable in 
the one which occurred here. 
The genus Proto was instituted by Dr Leach in the article 
Annulosa, already referred to. It has been adopted by M. 
Latreille, in the 44 Regne Animal” of M. Cuvier, vol. iii. p. 52., 
with the following character : 44 Qnt dix pieds, disposes dans 
une serie continue, depuis la tete jusqu'au quatrieme anneau in- 
clusivement.” It is true that there are only ten feet, if we ex- 
clude the two pairs belonging to the first and last segments of 
the body ; but if these be included, the number of feet should 
be stated at fourteen. This precision in enumerating the feet 
becomes the more necessary, since Latreille has added another 
genus, termed Leptomera , to the family Caprellad^e, which, 
in the character assigned to it, 44 Ont quatorze pieds, disposes 
dans une serie continue, depuis la tete jusqu’a fextremitie \ios~ 
terieure du corps,” (lb. p. 51.), would appear to differ on- 
ly in having four additional feet. But the Squilla ventricosa 
of Muller (Zool. Dan. tab. 56.), referred to as the type of the 
genus Leptomera, possesses the same number of feet as the 
Gammarus pedatus of the same author, referred to as the type 
of the genus Proto. The feet of the first and last segments of 
the body* however, have been enumerated by Latreille, in the 
character of his genus Leptomera, while they have been excluded 
from the character of the gemis Proto. The two genera, in con- 
sequence of this management, seem to differ in a character in 
which they agree. M. Lamarck, aware of this agreement, in- 
cluded both under one genus, to which, however, he gave, un- 
necessarily, a range of character 44 dix ou quatorze pattes” 
(Animaux sans Vertebres, v. p. 172.), and improperly gave the 
preference to the generic name Leptomera, devised by his coun- 
