216 ADDITIONS AND CORRECTIONS. 



P. 133. After lone thoracicus, add 



PacJiyldella (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 ctenopus, add 



Pachygnathus (Duges). Palpi thick, conical, 

 pointed ; mandibles slender, style-shaped ; limbs 

 as in Halacarus. 



P. no tops. 



P. 179. After line 19, add 



Order THYSANURA. 



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^E. 



Feet jointed, fit for walking ; body divided into 

 head, thorax, and abdomen ; breathing by air- 

 pipes (trachea] ; two antennae ; mouth rudimen- 

 tary ; abdomen composed of six segments, usually 

 ending in two bristles for leaping, bent under the 

 body. 



Anura (Gervais). Antennae 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. 



