y 
: 
Y^ ye 
w. P à 
EON Zoology, 280 
G. 9. PracusiA, Latr.*—Corpus minus depressum, crassius. Ar- 
tieulus maxillipedis externi 3tius apice 2di vix angustius, rato 
longior quam latior. Ramus maxillipedis 1mi internus apice 
transversus. d 
y FAw. IV. GECARCINIDJE. 
..— Oculi breves. Carapax obesus, paulo transversus, antice latus, cur. 
vvatim declivis, lateribus arcuatis poneque oculos large rotundatis, vix 
dentatis. Antenne interne transverse. Articulus abdominis maris 
2dus sterno contiguo vix angustior. Articulus maxillipedis externi 3tius 
costá obliquá piliferá non ornatus.  Palatum lineá elevatá vice efferentis 
limite non instructum. 
1. UCAINJE. Articulus maxillipedis externi 4tus apertus. 
1. Mazillipedes externi non. hiantes. 
G. 1. Uca, Leach.—Articulus maxillipedis externi 4tus angulo 3tii 
externo insitus. 
G. 4. GEcanciNvCus, ÉEdw.t—Articulus maxillipedis externi 4tus 
marginis medio apicalis 3tii insitus. 
2. Maxillipedes externi rhomboidicà hiantes. 
G. 3. CanprsouA, Latr.—Articulus maxillipedis externi 4tus apice 
.. . . 8li externo insitus. ut 
-...G. 4. GEcancoipEA, Edw.—Articulus maxillipedis externi 4tus 
marginis medio excavato apicalis 3tii insitus. ! 
9. GECARCININJE. Articuli maxillipedis externi 4tus et sequentes 
3tio celatus. 
* 
G. l. GECARCINUS. 
Fax. V. PINNOTHERID.JE. 
Oculi breves, orbitis insiti, raro non retractiles. Carapax sive obesus 
sive depressus, raro paulo oblongus et interdum parce rostratus, lateri: 
bus valde rotundatis. Antenns internz aut transversze aut oblique. 
Abdomen maris angustum, versus basin sterno contiguo valde an. 
gustius. [Species omnes parvae. ] 
2. PINNOTHERIN/ZE. Articulus maxillipedis. externi 2dus parvulus 
aut obsoletus. Corpus sive obesum sive depressum. 
* Plagusia and Philyra of De Haan, Faun. Japon., p. 31; the latter genus in his 
system including P/agusia depressa of authors, and the former the P. sqwamosa. The 
distinction between his two genera consists in this; the palpus of the outer maxilli- 
peds in P/agusia has a flagellum, and that of PAilyra, none. "(The name .PAilyra 
belongs to another genus of earlier date, instituted by Leach; moreover, the resem- 
blance between the species of these groups is so close in other characters, that we 
hardly consider the distinction important as a generic character. 
1 Jaequemont's Voy. dans Y Inde, plate 1. 
SxcoND Sznrxs, Vol. XII, No. 35.—8Sept., 1851. 9'7 
