18 AMPUIPODA NORM ALIA. 



the length of the animal ; peduncle as long as the flagelliim. First 

 pair of gnathopoda having a prominent tubercle at the inferior 

 margin of the carpus and the propodos ; the palm not oblique, and 

 much longer than the breadth of the joint; dactj-los curved, 

 shorter than palm. Second pair of gnathopoda having the pro- 

 podos ovate, palm oblique, rather more than the inferior half raised, 

 as in 0. Aiwklandice, and fringed with one long and two short 

 solitaiy haii-s alternately. 



Female. — First pair of gnathopoda with the propodos having the infe- 

 rior margin parallel with the superior ; palm short ; dactylos longer 

 than the palm. Second pair of gnathopoda having the propodos 

 and carpus subequal, and not tuberculated. 



Length scarcely half an inch, 



Hab. Port Famine. 



This animal is generally miich more spinous than 0. AucManclice. 

 The specimen from which this species was taken was procured 

 during the Expechtiou of the Zelee, and is pi^served in the MiLseum of 

 the Jardin des Plantes. 



3. Orchestia longicomis. (Plate III. fig. 1.) B.M. 



Orchestia loniricornis, Sat/, Proc. Acad. Philad. vol. i. pt. 2. p. 386. 

 Edwards, Hist, dcs Crust, t. iii. p. 18. 



Male. — Eyes large. Upper antennoe reaching to the end of the 

 penultimate joint of the peduncle of the lower. Lower anteniue 

 nearly as long as the animal ; the peduncle about half the length 

 of the antennas ; the last joint twice the length of the penultimate. 

 First pair of gnathopoda A^•ith the cai'pus nearly as long again as 

 the propodos, and furnished with a small tubercle ; dactylos longer 

 than the palm. Propodos of the second pair of g-nathopoda largely 

 developed, the palm being concave or hoUow, The third pair of 

 pereiopoda robust, and shorter than the two posterior. 



Length 1 inch. 



Hah. Kew Jersey {Say, by whom the specimen, from which oxzr 

 figure is taken, was presented to the Museum). 



4. Orchestia Gryllus. (Plate III, fig. 2.) B.M. 



Orchestia Grvllus, Bosc, Crust, ii. t. 15. f, 1, 2. 



Say, Journ. Acad. Philad. i. 386. 

 Seamballa Sayana, Leach IIS., and in Wldte's Cat. Crust, in P. 31. 



Upper antennae reaching slightly bej-ond the extremity of the penul- 

 timate joint of the peduncle of the lower. Lower antennae about 

 one-third the length of the animal ; last joint of the peduncle longer 

 than the preceding. The first paii' of gnathopoda having the caipus 

 somewhat longer than the propodos : the pakn enlarged ; dactylos 



