of a new Irish Crustaceous Animal. 35 
Crustacea, Briss. Lam. 
Entomostraca, Mull. 
Branchiopoda, Latr. 
Lophyropa, Latr. 
Genus Cyclops, Mull. 
(Sub-Genus Anomalocera.) 
Antenna; 4. superioribus duabus multo longioribus, cujusdam qui 
mares existimantur dextra in medio tumida, supra et extra 
oculi pedunculum exorientibus ; inferioribus, palpiformibus, 
virga minuta ad apicem pilosa e basi procidente, trium articu- 
lorum ultimis pilis longis curvatis instructs. 
Oculus unicus, in maribus valde peduculatus, in alteris (focminis) 
subsessilis. 
Corpus elongatum, sensim postice angustatum, segmentis 6 divi- 
sum: segmento primo majore, subtriangulare, in medio lateris 
dente incurvato et cum rostro deorsum bifurcato et hamato, 
super oculum porrigente. 
Cauda ultimo segmento, appendicibus duabus lamellatis quasi nata- 
toribus instructo. 
Pedes natantes pari 4. subaequales, ultimis articulis (me obser- 
vante) indivisis, sed intra cum lanceolis uno latere serratis, 
extra hamis tribus. Parum ultimorum pedes in sexubus et 
inter se dissimiles, maris dexter articulo apicale tumido, pro- 
cessu obtuso quasi pollice, et digito mobili instructo, sinister 
unguibus tribus rectiusculis. 
Anomalocera Patersonii. 
Body elongate, contracting posteriorly, composed of several 
joints ; the first large, sub-triangular, with obsolete sub-divisions, 
and a tooth on each side near the middle ; rostrated anteriorly, the 
rostrum curving downwards and dividing into two strong curved 
hooks which divaricate, the eye in some, which are presumed to 
be males, standing out between them. The joints of the body 
successively diminish in extent, the last prolonging itself into late- 
ral acuminate processes. The tail is composed of three or four 
joints, the last with two spatulate lamellae, to which are articulated 
at the apices five long, flat, hairy lances, the outer being externally 
serrated and occasionally contracted in its dimensions. 
The antennee are four. The superior about -J the length of the 
body ; in those, which I shall continue to call males, dissimilar, in 
the females alike, being with that on the left side of the males ta- 
pering, spiny, and numerously articulated, one articulation at the 
D 
