Ml. I- A. Hornulnili- — \ott.soii Car'ules. 207 



^5. L rocaridtiiu (^Poiitoniinic). 



Hody very sleiitler ami cornpri'ssod. Thorax without 

 dorsal swelling. Sixth abdominal sf^iiKMit tdoii^fate. Ito.s- 

 fruin Ion;;, iipcurved, toothed al)ove aiul hchjw. Outer 

 <lai,'olhiin of aiit«Muiule deeply cleft. Anteuual scale lon;r, 

 narrow. Mandilde with two-jointed palp. Second niaxil- 

 liped with podohrnncli. Third inaxillipi-d narrow, five- 

 jointed, with artlirohianch. 



4. Pontoniopsis (Pontoniiiiie). 



Body rjraceful, luit not niueh compressed. Thorax without 

 <lorsal swelling;. Sixth ahdonimal .segment short. Rostrum 

 rather short, depressed, lanceolate in dorsal view, toothless. 

 ( )uter fla^ellum of antennule moderately cleft. Antennal 

 S( ale of ^ood breadth. ]\Iandible without palp. Second 

 maxilliped without podobrancli. Third maxilliped with 

 vestigial arthrobranch. Eyes spherical. 



5. J'l ric/imenceus (Pontoniinze). 



Body rather stout ; ce|ihaIothorax deep, a good deal com- 

 pressed ; abdomen evenly curved. Thorax without dorsal 

 swelling. Rostrum rather short, compressed, toothed above 

 only. Outer antennularflagellum not deeply cleft. Antennal 

 scale of good breadth. J\Iandible without palp. Second 

 maxilliped without jiodobranch. Third maxilliped narrow, 

 with vesti;rial arthrobranch. 



IV. Definitions OF New Subgenera. 



The species of Periclimeius fall into four groups, as 

 follow : — 



I. li«)t.trum toothless. No spines on trunk and legs Eiisiqer. 



II. Kustruoj toothed. Spines at certain points on trunk and 

 legs. 



A. Cornea opival. [Upper edge of rostrum convex. Strong 



supraorbital spine. J Coniujer. 



B. Cornea not ogivai. 



1. Upper edgf of rostrum convex. Second leg with 



.xhort wrist, and unarmed save inone species. Supra- 

 orbital spine in one species only Cnstiycr. 



2. Upper edge of rostrum straight or concave. Second 



leg rarely with short wrist, generally with spine on 



wrist or arm or both. Supraorbital spine common .. Falciytr. 



