294 MANUAL OF NATUEAL HISTORY. 



bilobed lower lip, and a pair of jaws ; foot- 

 jaws rudimentary ; legs seven or eight pairs, 

 first short, the others long and slender ; ab- 

 doinen narrow, rudimentary. 



3. FAMILY. Glass-Shrimps (Erichthidse). Gills ru- 



dimentary; carapace large, lamellar, tran- 

 sparent, with a styliform beak in front ; first 

 two joints of head moveable, second joint of 

 outer antennse with an oval lamina with 

 ciliated margins ; upper lip triangular ; man- 

 dibles with two branches with dentate mar- 

 gins ; abdomen elongated, last segment very 

 large. 



4. FAMILY. Mantis-Crabs (Squillidse). Carapace 



leaving uncovered the first two rings of head 

 and last four of thorax ; thorax sub-quadri- 

 lateral, with a small moveable triangular 

 plate in front ; mandibles ending in two 

 divergent branches, with dentate margins ; 

 lower lip deeply bilobed ; second pair of 

 jaws long, and pediform, anterior foot-jaws 

 largely developed in the form of raptorial 

 feet folded thrice on themselves, and resem- 

 bling the fore-legs of the "Mantis"; abdo- 

 men very large. 



II. LEGION. SESSILE-EYED CRUSTACEANS 

 (Edriophthalmata). 



Gills replaced by portions of the legs modified for 

 that purpose. Body divided into head, thorax, and 

 abdomen ; no carapace ; eyes sessile. 



