34 . 
CATOMETOPA. 
Fam. Carcinoplacidae. 
1827. Gonoplaciens (part), Milne-Edwards, Hist. Nat. Crust., 
Vol? fh. pe 5. 
1852. Carcinoplacinae, Milne-Edwards, Ann. Sci. Nat., Zool., 
ser. 3, Vol. XVIIL., p. 164. 
1852. Gonoplacidae (part), Dana, U.S. Expl. Exp.. Vol. XIII, 
pp. 308, 310. 
1886, Carcinoplacinae, Miers, Challenger Brachyura, Reports, 
Vol AVILES pa 223. 
1894. Carcinoplacidae, Ortmann, Zool. Jahr., Vol. VII., p. 685. 
1899. Carcinoplacidae, Alcock and Anderson, Ann. Nat. Hist., 
ser 7. Vol TEL yp air: 
1899. Carcinoplacinae, Ortmann, in Bronn’s Thierreich, Vol. V., 
Pt. 2, Lieferumg 53;.p. 170: 
1900. Pseudorhombilinae, Alcock, Journ. Asiat. Soc. Bengal, 
Vol EXT: Pt ee: 86) 2925 207. 
Miers pointed out that Pseudorhombila, Milne-Edwardsy 
1837, is the oldest generic name at present included in this 
group. No doubt in deference to this priority, Alcock adopted 
the name Pseudorhombilinae in place of Carcinoplacinae. 
But it must be observed that de Haan’s Curtonotus was published 
some years before Pseudorhombila, and is therefore the premier 
genus in the group, although its original name, being pre- 
occupied, was cancelled by Milne-Edwards in favour of Car- 
cinoplax. The group is distinguished by Alcock from four 
other sub-families, the Gonoplacinae, which have a subquad- 
rate carapace, elongate eyestalks with long narrow orbits, 
the Prionoplacinae, in which the pleon is narrower at base 
than the interval between the last pair of legs, the Rhizopinae, 
in which the alternative characters seem rather too numerous 
for a natural family, and the Hexapodinae, in which the fifth ° 
pair of legs are wanting. 
Gen. Geryon, Kroyer. 
_ 
o.2 
oP) 
36. Geryon, Kroyer, Naturhist. Tidsskrift, Vol. 1., Pt. 1, 
Pp: 13; 20! 
1852. Eucrate (part), Dana, U.S. Expl. Exp., Vol. XIIL, 
p. 310. 
1856. Chalaepus, Gerstaecker, Arch. Naturg. Jahrg. 22, Vol. L., 
Ds X16; 
