CRUSTACEA. 
i>-20 
of tlie species do we find tliose long' oar-like cirri observed in the first 
of tlie lones. 
In the latter, when it exists, the moveable toe of the foot, ternii- 
nated by a force})s, is formed of a single joint. 
( )f these last, there are some whose superior antenrue are much 
shorter than the inferior, and even than their ]»cduncle; tlie stem of 
tlic latter is comiiosed of numerous joints. 
Orchestia, Leach. 
'The second feet of the male terminated by a large forceps, the 
moveable toe long and somewhat curved ; those of the female by two 
toes. The third joint of tlie inferior antenncC is at most tAvice the 
length of that of the preceding ones * * * § . 
Talii’rus, Lai. 
Neither of the feet forming a forceps. The tliii'd joint of the in- 
ferior antenncB more than tAvice the length of that of the preceding 
oiH's ; the antennae large and sjiinous f. 
In the folloAving, the superior antennae arc ncA'cr much shorter 
than the inferior. 
Some of them, furnished Avith elongated setaceous antennae ter- 
minated by a iiluri-articulated stem, and Avithout any remarkable 
forceps, approach the preceding* in their superior antennae, AAdiich 
are someAvhat shorter than the inferior, and are removed from those 
that folloAV by the form of their head Avhich is narroAved before into a 
kind of snout. Such is 
Atyuus, Leach ;];. 
All those Avhich succeed have the superior antennae as long as the 
inferior, or longer; their head is not elongated into a snout. 
Here, as in the five folloAving genera of Leach, the peduncle of the 
antennae is formed of three joints §. 
Some, in their sujierior antennae, jircsent a character Avhich is 
unique in this order — the internal extremity of the third joint of the 
]H>duncle is provided Avith a little articulated thread. It distinguishes 
the 
Gamaiarus, Lai., 
Wdierc the four anterior feet have the form of small forceps, the 
moveablc toe folding beneath. 
* Oiiiscus (jummarellus, I’all., .Spic. Zool., Fascic., IX, iv, 8; Vanrer rjummarus 
li/foreus, Montag.; Desnuir., Consitl., p. 261, XLV, S. 
OniscHS locusfu, Pall., Spic. Zool., Fascic. IX, iA^, 7 ; Cancer (jammarus saltalor, 
Montag. ; Desmar., Consicl., XLV, 11. 
t Al/y/us cannrt/ws, Leach, Zool. Misc., LXIX ; Desmar., tlonsid., p. 262, XLA', 
4; Gunimarus carinatus, Fab.; — G. nuyax ejusd. ; Phipps, Voy. to the North 
I’ole, XII, 2 ; 
§ The third joint of the peduncle may he very small and thus become assi- 
milated to the folloAving, or those of the stem; this peduncle, as in the De.vamincs, 
then appears to consist of Init two joints. According to the system of Leach the 
stem is understood to form another but compound joint. 
