L.EMARGUS. 29B 



1. Cecrops Latreillii. Tab. XXXIV, figs. 1, 2. 



Cecrops Latreillii, Leach, Enc. Brit. Supp., i, t. 20, f. 1-5. 



— Lamarck, An. s. Vert., edit. 1st, v, 138. 



— Latreille, Enc. meth., t. 335, f. 3-9. 



— Desmarest, Cons, sur les Crust., 338, t. 50, f. 2. 



— Ghierin, Icon. Regne An. Crust., t. 35, f. 8. 



— M. 'Edwards, Hist. Nat. Crust., iii, 471- 



Description. — This animal is about an inch long (the 

 female), and is of a pale horny colour. The frontal edge 

 of the carapace is deeply notched, as is also, in a less 

 degree, the lower margin of the elytraform appendage, 

 and the last thoracic segment of the body. The termi- 

 nating strong hooks of the foot-jaws are of a deep black 

 colour, contrasting strongly with the light horny colour 

 of the rest of the body. The male is not above one third 

 the size of the female. 



Hah. — On the Orthagoriscus moke, Kinsale, G. J. 

 Allman, Esq., August 1848. Dublin coast, R. Ball, Esq., 

 W. Thompson, Esq. Selsey Bill, near Bognor, Sussex, 

 August 1835-6 (?), G. Newport, Esq., British Museum. 

 Weymouth, Professor E. Forbes, and R. M'Andrew, Esq. 

 In all these instances they were taken from the sun-fish, 

 and adhering to the gills. 



Genvs 2 — LiEMARGUs. 



LiEMAKGUs, Kroner, i, 500. 



— M. Edwards, Hist. Nat. Crust, iii, 474. 



Chnracter. — Elytriaform appendage of considerable size. 

 The feet are foliaceous and branchial. The upper seg- 

 ments of the thorax are distinct and small. 



Bihliographical History. — Kroyer established the genus 

 in his ' Tidsskrift,' in 1838. Finding all the feet folia- 

 ceous and branchial, he considered it a sufficient character 

 to separate the species from Cecrops, to which it is so 

 nearly allied, and form it into a distmct genus. M. 



