ORDER L^MODIPODA. 213 



THE FOURTH ORDER OF CRUSTACEA. 



LiEMODIFODA, 



Are among the malacostraca with sessile eyes ; the only ones 

 in which the posterior extremity of the body presents no dis- 

 tinct gills; which have almost no tail, the last two feet being 

 inserted at this end, or the segment serving as an attachment 

 for them, being followed only by one or two other articulations 

 very small. They are, again, the only ones in which the two 

 anterior feet, which correspond to the second jaw-feet, form a 

 portion of the head. 



They have all fom* setaceous antennae, and carried on a pe- 

 duncle of three articulations, mandibles without palpi, a vesi- 

 cular body, at the base of four pair of feet at least, commencing 

 from the second or third pair, those of the head comprized. 

 The body, most frequently filiform or linear, is composed, 

 reckoning the head, of from eight to nine articulations, with 

 some small appendages, in the form of tubercles, at its poste- 

 rior and inferior extremity. The feet are terminated by a 

 strong hook ; the anterior four, the second of which are largest, 

 are always terminated in a monodactylous pincer or talon. In 

 many the four following are shortened, less articulated, with- 

 out hook at the end, or rudimentary, and by no means proper 

 for the ordinary uses. 



The females carry their eggs under the second and third 

 segments of the body, in a pouch formed of approximated 

 scales. 



These Crustacea are all marine. M. Savigny considers 

 them as neighbouring the pycnogonides, and making with 

 them the passage to the arachnida from the Crustacea. 



