ANTHOSOMA. 297 



own specimens to be identical with his Anthosoma, though 

 the figure given in the work quoted above was so bad as 

 to make it almost impossible to identify it from that alone. 

 In 1826 Risso described it again in his 'Hist. Nat. Eur. 

 merid.,' under the name of OtropUesa imbricata, giving 

 Leach as his authority for the generic name ! 



Lamarck retains the name of Caligus, but Latreille, 

 Kroyer, M. Edwards, and other authors, have adopted the 

 genus, though only one species has as yet apparently been 

 described, unless the species described by Abildgaard 

 may be considered different. 



Anatomy and Physiology, fyc. The general form of 

 the animal is oval ; and we distinguish as usual the head, 

 thorax, and abdomen. 



The head is of tolerable size, and distinct, consisting 

 of a stout, rather narrow, and strongly convex, horny 

 buckler of an ovoid shape. It is very narrow, thick, and 

 obtuse in front, where it has a furrow running across its 

 dorsal surface, and a deep notch on each side, which thus 

 forms a beak, and almost divides it into a separate seg- 

 ment. It extends backwards for some length, and becomes 

 considerably broader, covering a portion of the thorax. 



The segments of the thorax are verv indistinct. On 



O B _ i 



the dorsal aspect we perceive two foliaceous elytraform 

 appendages of an oval shape, and of a light horny and 

 somewhat granulated texture. Beneath these the remain- 

 ing portion of the thorax is seen, of a fleshy structure, 

 and apparently without any divisions. 



The abdomen is very small, consisting of one short 

 segment, which gives off two small caudal appendages, 

 in form of short, flat, blunt filaments of the same texture 

 as the elytraform appendages. Immediately beneath the 

 notch, on each side of the blunt beak, we see a small, 

 flat body, and from near the base of each of these we 

 find the origin of the antennae. These organs are rather 

 long and slender, and consist of six articulations, tapering 

 from the base to the extremity. 



