216 ADDITIONS AND CORRECTIONS. 



P. 133. After lone thoracicus, add — 



Pachyhdella (Diesing). Body a three-sided sac, 

 containing eggs arranged in bundles, like bunches 

 of grapes ; intestine passing straight through the 

 body. Attached by the mouth to the abdomen of 

 Crabs. 



P. carcini. (See Ann. N. H. for Sept. 1855.) 



P. 177. After Halacarus ctenoji)uSy add — 



Pachygnathus (Dug^s). Palpi thick, conical, 

 pointed ; mandibles slender, style-shaped ; limbs 

 as in Halacarus, 



P. notops. 



P. 179. After line 19, add— 



Order THY8ANURA. 



No wings ; three pairs of legs ; peculiar organs 

 for locomotion at the sides or at the extremity of 

 the body ; no proper metamorphosis. 



Family Podurad^. 



Feet jointed, lit for walking ; body divided into 

 head, thorax, and abdomen ; breathing by air- 

 pipes [tracliece) ; two antennas ; mouth rudimen- 

 tary ; abdomen composed of six segments, usually 

 ending in two bristles for leaping, bent under the 

 body. 



Anura (Gervais). Antenna conical, shorter 

 than the head, composed of four joints ; four pairs 

 of eyes ; mouth without jaws, placed at the end 

 of a conical proboscis ; no scales ; no leaping 

 apparatus ; no terminal points. 



A. maritima. 



