326 BRITISH ENTOMOSTRACA. 



species the same degree of development and structure, and 

 that in some species, Ckondracanthus Lophii for example, 

 only a single small specimen is found on each female, and 

 in other species, on the contrary, two small specimens are 

 found in the sexual apertures of a female, sufficient reason 

 may be found to support Nordinann's view, and to esta- 

 blish its truth." 



Genus 1 CHONDRACANTHUS.* 



CHONDRACANTHUS, De la Roche, Nouv. Bull. Soc. Phil., ii, 1811. 



Lamarck, Hist. An. s. Vert, edit. 2d, iii, 6S1. 

 CHONDRACANTHUS (pars}, H. Edwards, Hist. Nat. Crust., iii. 

 LERNACANTHA, Blainville, Journ. de Pliys., xcv, 442, 1822; Diet. Sc. 



Nat., xxvi. 

 Desmarest, Cous. gen. Crust., 350. 



Character. Two pairs of foot-jaws prehensile, the third 

 nearly rudimentary. Appendages of thorax representing 

 the feet, in form of digitated, but not articulated, and not 

 setiferous lobes or tubercles. Oviferous tubes very short, 

 broad, and flattened. 



The genus Chondracanthus was established by De la 

 Roche in 1811, in the 'Nouv. Bull, de la Soc. Philom./ 

 upon a species of Lernea which he found attached to the 

 Zeus fader, and which appears to be characterised by its 

 exceedingly bizarre appearance, as if it were stuck over 

 with horny spines or tubercles, and having the oviferous 

 tubes short, broad, flattened, and nearly concealed be- 

 tween the elongated, terminating, lateral prolongations. 



Blainville, in the 'Journal de Physique,' 1822, in his 

 monograph of the Lerneada?, established upon the same 

 species his genus Lernacantha ; but the name of Chon- 

 dracanthus has by most succeeding authors continued to 

 be retained. 



* Xoj-fipof, cartilage; and nKavOn, .spine. 



