296 BRITISH ENTOMOSTRACA. 



We have only one British family belonging to this 

 tribe. 



Family ANTHOSOMAM. 



DICHELESTID.E (pars), M. Edwards. 

 CALIGID.E, RACE i (pars), Leach, Diet. Sc. Nat. 



Desmarest, Cous. gen. Crust. 

 ERGASILINA (pars), Kroyer, Burmeister. 



Character. Head of considerable size, in form of a 

 narrow, ovoid, convex buckler, and having attached to it 

 near the mouth a pair of large foot-jaws, armed Avith 

 strong hooks. Thorax furnished with elytraform appen- 

 dages. Feet, three pairs ; all foliaceous. 



Genus ANTHOSOMA. 



ANTHOSOMA, Lettc/i, Desmanst, Kroyer, M. Edwards, Durmeisler, Latretlli-. 

 CALIGUS, Abildgaard, Risso, Lamarck. 

 OTROPHESA, Risso, Hist. Nat. Eur. nicrid. 



Bibliographical History.-- Abildgaard was the first 

 person who noticed any of the species of this genus. In 

 the Mem. de Copenhagen, 'Act. Soc. Nat. Havn./ 1794, 

 he describes a species under the name of Caliytis crassus, 

 with considerable details, pointing out its peculiar confor- 

 mation. 



Leach, however, was the first to form the genus ; per- 

 haps without knowing Abildgaard's description or figure, 

 as he took as the type of his new gemis a specimen taken 

 from a shark on the coast of England. He first described 

 it in the 'Encyclopaedia Britannica,' 1816, and after- 

 wards in the 'Diet. Sc. Nat./ 1819. 



About the same time as Leach described the individual 

 from which he formed the genus, Risso described shortly, 

 and figured very badly, the same species from the Medi- 

 terranean. In his 'Crustac. des Envir. de Nice/ 1816, 

 he describes a species of Caligus, under the name of 

 Califfus imbricates, which Leach ascertained from Risso's 



