278 
BRITISH ENT0M0STRACA. 
6. Lepeoptheirus Thompsons Tab. XXXIII, fig. 2. 
Female. Carapace round. Frontal plates small. An- 
tennae well developed. Thorax about the fourth part the 
size of the carapace. Penultimate segment very small. The 
last nearly quadrilateral; the posterior edge deeply lobed. 
Abdomen long ; the length of the thorax ; upper por- 
tion narrow, and bulging out as it approaches the tail. 
Caudal plates short, rather broad, and giving off three 
long, plumose setae, and two shorter ones. Sternal fork 
with sharp, simple branches. 
Male . — Carapace round, but rather broader than in 
female. Thorax and abdomen both considerably shorter 
than in female. 
Hab . — Taken from the turbot, March 1837, along with 
Faligus Mulleri and C. diaphanus ; W. Thompson, Esq. 
Genus 3 — Chalimus. 
Chalimus, Burmeister, Nov. Act. Acad. Nat. Cur. Bonn., xvii. 
— M. Edwards, Hist. Nat. Crust., iii. 
— Kroyer , Tidsskrift, ii. 
Character.— Feet, as in preceding genera. Thorax 
exhibiting four distinct segments. Frontal plates without 
lunules, or sucking-discs, but provided with a long and 
slender appendage adapted for prehension, arising from 
the centre of its anterior surface. 
The genus Chalimus was first established by Burmeister 
in the ‘Nov. Act. Acad. Nat. Cur. Bonn./ in 1835, to 
receive a small animal, closely allied to, and nearly 
resembling the Caligi, but possessing a long and slender 
appendage arising from the centre of the frontal plates, by 
which it fixes itself to its prey. He found it attached to 
a mackerel; but Kroyer afterwards discovered the same 
species adhering to a Caligus ; and the only specimen I 
have yet met with, I found also parasitic upon an indivi- 
dual of that genus. 
