222 
CRUSTACEA. 
ticulated ; those of the second pair consisting of a single and long 
joint*. 
Cerapus, Say. 
Large antennse, the peduncle consisting of three — the superior — 
or four — the inferior — ^joints ; the two anterior feet small, with a 
uni-articulated toe ; the two following terminating in a large triangu- 
lar, smooth, dentated hand, with a bi-articulated finger. 
Ceraphus tubularis. Say, Journ. Acad. Nat. Sc. of Philad., I, 
iv, 7 — 11 ; Desmar., Consul., XLVI, 2. It inhabits a little cy- 
lindrical tube, and in this respect approaches the subsequent 
subgenus. Very common at Egg Harbour, New Jersey, among 
the Sertulariae on which it appears to feed. 
Finally, the inferior antennae, sometimes much larger than the 
superior, their stem consisting at most of four joints, have the form 
of feet, and appear to serve, at least occasionally, as organs of pre- 
hension. 
Here the second feet are terminated by a large forceps. 
PoDOCERUS, Leach. 
Eyes very prominent f. 
Jassa, Leach. 
Eyes not prominent 
There, neither of the feet is terminated by a large forceps. 
CoROPHiuM, Lat. 
C. longicornis ; Cancer grossipes, L. ; Gammariis longicornis. 
Fab.; Oniscius volutator, Pall., Spic. Zool., Fascic. IX, iv, 9 ; 
Desmar., Consid., XLVI, 1, called Peryns, on the coast of Ro- 
chelle, lives in holes, which it forms in the mud, that is covered 
with hurdles, called houchots, by the inhabitants. The animal 
does not make its appearance till the beginning of May. It wages 
everlasting Avar against the Nereides, Ampliinomse, Arenicolse, 
and other marine Annelides, Avhich inhabit the same locality. A 
curious spectacle is presented by these Crnstacea, Avhen the tide 
is coming in ; myriads of them may then be seen moA'ing in every 
direction, beating the mud Avith their great arms, and diluting 
it in order to discover their jjrey — is it one of the aboA^e men- 
tioned Annelides they have discoAmred, Avhicb is ten or tAventy 
times larger than themselves ? they unite to attack and dcA'our 
it. The carnage never ceases until the mud has been thoroughly 
turned up and its inequalities levelled. They do not even 
spare Mollusca, Fishes, or dead bodies on the shore. They 
mount upon the hurdles Avhich contain Muscles, and fishermen 
* Cancer articxdosus, Montag., Trans. Lin. Soc. VII, G ; Desmar., Consid., p. 
2G3, XLV, 5. 
t Podocerus variegaltts, Lcacb, Trans. Lin. Soc., XI, p. 361 ; Desmar., Consid., 
p. 269. 
X Jassa pukhella, Leach, lb;, p. 361 ; Desmar,, Consid., p. 269. 
