42 AMPniPODA NORMA LI A. 



twice as long as the flagellum, one-half of which is fused into 

 one articulation, and resembles an extra articulation attached to 

 the peduncle. First pair of gnathopoda ha\ing the propodos and 

 cai-pus equally short and stout ; the palm but slightly receding, 

 and nearly one-third longer than the dactylos, which is robust 

 and curved ; it impinges at the apex against four short, strong, 

 small, blunt spines ; these are situated laterally instead of iipon 

 the palm. Two or three small hairs upon this pair of Hmbs appear 

 to be all that are on the animal ; all the other parts are pez-fectly 

 clean. Second pair of gnathopoda having the propodos much 

 larger than in the first ; it is ovate, long, and tapering towards 

 the extremity, the palm being two -thirds the length of the in- 

 ferior margin. 

 Length of the animal ^ths of an inch. 



The specimen in the British Museum was brought from South 

 Australia. M. Milne-Edwards gives New Holland as the habitat of 

 his specimen ; and Prof. Dana obtained his from the shores of Illa- 

 warra, New South Wales. 



Dana has divided his genus Allorcliestes into two di-sdsions, in order 

 to separate this species from the rest, in consequence of the shortness 

 of the flagellum of the inferior antenna). It is quite e%ident that 

 that distinguished naturalist has mistaken the fused portion of the 

 flagellum for a portion of the peduncle ; hence his desire to separate 

 A. Gaimardii from the rest of the genus, — an arrangement that 

 appears to be neither natural nor convenient. 



12. AUorchestes Pereiri. (Plate VI. fig. 10.) B.M. 



Orcliestia Pereiri, Lucas, Exped. dans VAlfjerie. 



Orchestia Bonelliaua, White, Cat. Crust. B.M. 1847. 



Amphitoe aquilina, Costa, Rend.deUaRealeAccad.NapoU,^.\7^, 1853. 



Eyes round and small. Superior antennae rather more than half 

 the length of the inferior. Inferior antenna) not one -third the 

 length of the animal ; the flagellum of each pair of antennas 

 longer than the peduncle. Propodos of the first pair of gnathopoda 

 longer than the carpus, quadrate, somewhat narrower at the base 

 than at the palm, which is slightly oblique and fringed with 

 cilia ; carpus inferiorly produced to a small extent. Propodos of 

 the second pair of gnathopoda weU developed, ovate, long, and 

 tapering ; the palm occupying nearly the entire length of the 

 inferior margin. Third pair of pereiopoda shorter than the two 

 posterior. 



Length -g-fths of an inch. 



The specimens in the British Museum were brought from Genoa 

 by the Marquis of Spinola ; but although found upon the northern 

 coasts of the Mediterranean, I beheve them to be of the same species 

 as that which M. Lucas found upon the coast of Algeria. There are 



