OUCHESTID^i:. 21 



penultimate joint of the peclimcle shorter than the ultimate. The 

 fii-st pair of gnathopoda ha\ing the caqnis a little lunger tlian the 

 projiodos, and fiu-nishcd Avith a small protuberance ; dactylos slight, 

 and reaching beyond the extremity of the palm, which itself is 

 considerably produced. The second paii' of gnathopoda haA-ing the 

 hand tnangular, Avitli an indentation in the ynhn corresponding to 

 a protuljcrancc in the dactylos. Tliii'd and fourth pairs of pcroioi)oda 

 subcqual. Fifth very much longer; the carpiis on the fifth paii- 

 of pereiopoda is furnished with a squamiform plate of consider- 

 able dimensions, which is concave on the side next the animal, 

 and convex upon the opposite. 

 Length -^ths of an inch. 



Female. — Upper antenna) reaching to the extremity of the pcnid- 

 timatc articulation of the pediuicle of the lower. The first paii* of 

 gnathopoda having the palm of the propodos convex : there is an 

 indentation in the meros, as if it received the extremity of the pro- 

 podos when folded in (the specimen was a dried one ; hence this may 

 be a doubtful specific diagnosis). The dactylos of the second pair 

 of gnathopoda articulates remotely from the apex of the propodos, 

 which is turned up at the extremity. The filth coxa as deep as 

 the foui'th. The bases of each of the three posterior pereiopoda 

 is serrated posteriorly, and fuiTiished with short, sharp, stout hairs 

 anteriorly. Carpus of the posterior pair of pereiopoda not largely 

 developed. 



Length ^ths of an inch. 

 ITab. New Zealand. 



The specimens of this species were taken under dead leaves in the 

 woods by Mr. Hook, during the voyage of the Erebus and Terror, 

 and presented to the British Museiim. 



y. Orchestia syMcola. (Plate III. fig. 7.) B.M. 



Orchestia svlvicola, Dana, Proc. Amer. Acad. Sci. ii. 202; U. S. 

 Explor. Exped. p. 874, pi. 59. f. 2, 3. 



Male. — Eyes round, not large. Upper antennae long, reaching be- 

 yond the penultimate joint of the lower. Lower antenna) slight, 

 more than half the length of the animal ; the flagcUum as long as the 

 peduncle, the last joint of which is as long again as the penultimate. 

 The fii-st pair of gnathopoda having the projjodos but little shorter 

 than the car])us ; a large tubercle is present on the meros and 

 carpus, and the extremity of tlm propodos is broiully dcvelo])e(l ; 

 dact5'lo8 not longer than the palm. Propodos of the second pair of 



