, • CLASS r. CRUSTACEA. 79 



** With a rostna/i, hid no juxcs : antenna tico. > 

 Genii^ 2. CALIGUS, Mull., Latr., Bosc, Leach. 



Shell coriaceous-membranaceous, bipartite ; tlie anterior segment in- 

 versely cordiform, very deeply notched behind (the notch receiving 

 the hinder segment, which is round), the anterior part suliproduced, 

 notched; the lacinia^ at their base externally bearing antennae : an- 

 tenna biarticulate, the first joint thickest, the second witli a simjile 

 seta at its extremity : alxlonicn narrower than the thorax, with its base 

 contracted and bearing the hinder legs, its extremity on each side 

 with a rounded process of the length of the body: rostrum, roinided, 

 rather more slender towards its apex, which is obtuse : less fourteen, 

 anterior; second and fourth pairs with a strong claw; the second 

 pair short; the third slender, elongate, the last joint double, with 

 inicqual lacinia:; the fifth, with the last joint on one side setose, the 

 setie ciliated on each side; the sixth with a doidile triarticulated tar- 

 sus, the last joints on each side setose, the set£e ciliated on each side; 

 the seventh pair with its last joint trifid: the hinder segment of the 

 thorax beneath, terminated by a large broad lamella, ciliated behind. 



Sp. 1. Cul. Midleri. Leach, Eucycl. Brit. Supp.,vol. 1. PI. 20. 



Inhabits the common cod-fish. 



Genus 3. PANDARUS, I^^ath. Caligus, Mnll, Latr., Bosc. 



Shell coriaceous-membranaceous, composed of but one part, deeply 

 notched behind; the angles acute; the middle of the notch toothed ; 

 anteriorly narrower, rounded, with a process on each side externally 

 bearing the antennie: untcnme composed of two joints, the second 

 joint terminated by several seta^ : abdomen somewhat narrower thaxi 

 the shell, the base above with two transverse lamelkr, the first of 

 which is four-lobed, the second bilobate: the apex notched, witii two 

 filaments longer than the body, with a lamella at their base above: 

 nw//v«rt elongate, attenuated, inserted behind the anterior legs : legs. 

 fourteen; anterior pair short, terminated by a short claw, and arising 

 from beneath an ovate process; second pair with a double, unequal 

 tarsus; third pair without any determinate form, without any claw; 

 fourth pair bifid; fifth and six pairs bifid, their cox;e connected by a 

 lamella; seventh pair bifid, the exterior lacinia longest, with a notch 

 externally towards its apex. 



Sp. 1. Fund, bieolor. Shell and the middle of the abdominal lamella 

 black; tail with filaments double the length of the body. 



Pandarus bieolor. Leach, Encycl. Brit^ Supp. vol. 1. PL 20. 



Inhabits the Squalus guleus of Linne. 



Genus 4. ANTIIOSOMA, Leach. 

 iSAe// coriaceous-membranaceous, unipartite, rounded before and behind; 

 the anterior part as if uni-lobate, the lobe higher than the shell, be- 

 hind on each side, bearing the anterjhse : nntenua bi.x-jointed : abdo- 



