oRcnESTii)^. 40 



1 7. Allorchestes humilis. (Pj.axe Vll. fig. 5.) 



Allorclu'stes humilis, Dunit, Proe. Amer. Acad. Sci. Host. ii. 20G ; 

 U.S. Explor. Exped. p. 890, pi. GO. f. 6. 



" Female ? — Superior antenme a little shorter than the inferior ; fla- 

 gellum six- to eight-jointed. Inferior pair about one-thii'd as long 

 as bodj- ; flagcllum nine- to ton-jointed, joints a little oblong, setae 

 all very short. Propodos of first i^aii" of gnathopoda small, oblong, 

 a little smaller at base, oblique at apex. Propodos of second pair 

 of same form, and not twice as long, inferior margin slightly 

 emarginate ; palm oblique, transverse, hirsute ; dactylos short. Last 

 four feet nearly equal, fifth pair a little shorter ; seta; few, veiy 

 short ; firet joint nearly orbicular ; posterior margin slightly crenu- 

 late. Maxillipeds with the penidt joint narrow. 



" Length four lines. 



" Hah. From shallow pools of water along shores of Port Jackson, 

 New South Wales. Collected December 25th, 1839."— Z>rt«a. 



18. Allorchestes australis. (Plate VII. fig. 6.) 



Allorchestes australis, Dana, Proc. Amer. Acad. Sci. Bost. ii. 20G ; 

 U. S. Explor. Exped. p. 892, pi. GO. f. 7. 



" Superior antenna) a little shorter than inferior ; flagcllum longer 

 than base, about fourtcen-jointed, joints towards base transverse. 

 Inferior antennae less than half the body in length; flageUum 

 rather longer than base, twelve- to fourteen-jointed, joints mostly 

 oblong, setae nearly obsolete. Propodos of first pair of gnathopoda 

 quite small, but little oblong, much narrower at base than at apex, 

 nearly direct truncate at apex ; dactylos not longer than breadth 

 of propodos. Propodos of second pair of gnathopoda large, sub- 

 ovate, palm depressed, posterior angle with a few minute setae ; 

 carpus produced into a naiTow process between the propodos and 

 fourth joint. Three posterior pairs of pereiopoda gradually in- 

 creasing in length, third joint quite broad, seta3 very short. 



" Length six lines. 



"Ilab. Shores of lUawarra, New South Wales." — Dana. 



19. Allorchestes orientalis. (Plate VII. fig. 7.) 



Allorchestes orientalis, Dana, U. S. Explor. Exped. p. 890, pi. 61. f. 2. 



"Superior antennae a little shorter than inferior; flagcllum moniliform, 

 seven-jointed, longer than base. Inferior antennae half as long as 

 body, last two basal joints equal ; flagcllum nearly twice as long 

 as base, moniliform, fourteen-jointed, joints obloug, setae short. 



