CLASS I. CRUSTACEA. 
79 
** With a rostrum, hut no jaws: antenna txco. 
Genus 2. CAUCUS, Mi///., Latr., Bose, Leach, 
Shell coriaceous-membranaceous, bipartite; the anterior segment in- 
versely cordiform, very deeply notched behind (the notch receiving 
l he hinder segment, which is round), the anterior part subproduced, 
notched ; the lacinur. at their base externally bearing antenna: : an- 
te >ma Inarticulate, the first joint thickest, the second with a simple 
se ta at its extremity : abdomen narrower than the thorax, with its base 
contracted and bearing the hinder legs, its extremity on each side 
"ith a rounded process of the length of the body: rostrum rounded, 
hither more slender towards its apex, which is obtuse : legs fourteen, 
ai tterior; second and fourth pairs with a strong claw; the second 
fair short; the third slender, elongate, the last joint double, with 
Unequal lacinias; the fifth, with die last joint on one side setose, the 
Sct ® ciliated on each side ; the sixth with a double triarticulated tar- 
n's, the last joints on each side setose, the seta; ciliated on each side ; 
l| ie seventh pair with its last joint trifid: the hinder segment of the 
£ ill orax beneath, terminated by a large broad lamella, ciliated behind, 
jl’j '• C «/. Mullen. Leach, Encycl. Brit. Supp., vol. 1. PL 20. 
11 la hits the common cod-fish. 
Shell 
Genus 3. 1‘ANDARUS, Leach. Caligus, Mali., Latr., Bose. 
coriaceous-membranaceous, composed of but one part, deeply 
notched behind; the angles acute; the middle of the notch toothed; 
“Ulteriorly narrower, rounded, with a process on each side externally 
hearing the antennae: unto nine composed of l.wo joints, the second 
Joint terminated by several setae: abdomen somewhat narrow er titan 
l be shell, the base above with two transverse lamella-, the first of 
*<fich is four-lobed, the second bilobate : the apex notched, with two 
“laments longer than the body, with a lamella at their base above s 
r °stru> n elongate, attenuated, inserted behind the anterior legs : kgs 
ourteen; anterior pair short, terminated by a short claw, and arising 
r°ni beneath an ovate process; second pair w ith a double, unequal 
j. rsus ; third pair without any determinate form, without any claw; 
°urth pair bifid ; fifth and six pairs bifid, their coxa; connected by a 
mella; seventh pair bifid, the exterior laciuia longest, with a notch 
§ ^emally towards its apex 
Pand. bicolor. Shell and the middle of the abdominal lamella 
ta ti with filaments double the length of the body. 
1 nkv S bicolor. Leach, Eiuycl. Brit . Supp. vol. 1. PL 20. 
a bits the Syuahis gateus of Linne. 
Genus 4. ANT1I0S0MA, Leach. 
Shell 
coriaceous-membranaceous, unipartite, rounded before and behind ; 
‘e anterior part as if uni-lobate, the lobe higher than the shell, be- 
u “d on each side, bearing the antennae; antenna six-jointed: abdo- 
