CRUSTACEA. 671 



feet ch elate, unequal, the last much smaller. Middle antennae 

 elongate, with two unequal setse at the apex. 



Sp. Birgus latro, Payurus latro FABR., DESMAR. Crust. PI. 30, fig. 3. 



Phalanx II. Hippoidea. First pair of feet monodactylous or 

 subchelate. Four or six following feet with last joint pinniform, 

 lamellose. Fifth pair of feet short, thin, incurved. Penultimate 

 segment of tail with two appendages on each side lamellose, oval, 

 ciliate. Shell oblong. 



Hippa FABR. (exclusive of some species). External antennas 

 very long, terminated by a multiarticulate ciliated seta. First pair 

 of feet with terminal joint lamelliform. 



Sp. Hippa emerita, Cancer emeritus L., DESMAR. Crust. PI. 19, fig. 2, on the 

 coast of Brazil. 



Eemipes LATR. Middle antennas bisetose at the apex, longer 

 than external. First pair of feet long, with last joint acuminate. 



Sp. Eemipes testudinarius LATR., Hippa adactyla FABR., Cuv. R. Ani. 6d. I. 

 PI. 12, fig. 2, DESMAR. Crust. PI. 29, fig. i, from the coast of New 

 Holland. 



Albunea DALD., FABR. (in part). Middle antennae longer than 

 I external, terminated by a single seta, very long. Anterior feet sub- 

 chelate, with moveable finger incurved. Shell oblong, with anterior 

 I margin broader, almost straight. 



Sp. Albunea symnista FABR., DESMAR. Crust f f\. 29, fig. 3, GUERIN Iconogr., 

 Crust. PI. 15, fig. i, from the Indian Ocean. 



Section II. Decapoda Irachyura (KleistagnatJia FABR.). Tail 

 j or posterior part of abdomen small, reflected forwards, almost 

 I always received in a furrow of sternum, not terminated by a pinna, 

 I with appendages filiform, in females oviferous, not natatory. Third 

 I pair of maxilliform feet broad, covering the cibarious organs. Vulvae 

 I mostly situated in sternum, between the bases of third pair of feet. 



Antennae short ; middle received in a furrow under the anterior 

 I margin of shell in most, terminated by a double subulate seta. 



A. Two or four last feet inserted towards the back, not in the 

 same plane with anterior feet. 



