j\Ir. L. A. BorraJaile — ^'otes on Carides. 207 



3. Urocaridella (Pontoniinse). 



Body very slender and compressed. Thorax without 

 dorsal swelling. Sixth abdominal segment elongate. Ros- 

 trum long, upcurved, toothed above and below. Outer 

 flagellum of antennule deeply cleft. Antennal scale long, 

 narrow. Mandible with two-jointed palp. Second maxil- 

 liped with podobrancli. Third maxilliped narrow, five- 

 jointed, with arthrobraiicli. 



4. Pontoniopsis (Pontoniinse). 



Body graceful, but not much compressed. Thorax without 

 dorsal swelling. Sixth abdominal segment short. Rostrum 

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

 Outer flagellum of antennule moderately cleft. Antennal 

 scale of good breadth. Mandible without palp. Second 

 maxilliped without podobrancli. Third maxilliped with 

 vestigial arthrobranch. Eyes spherical. 



5. Perich'menceiis (Pontoniinae). 



Body rather stout ; cephalothorax deep, a good deal com- 

 pressed ; abdomen evenly curved. Thorax without dorsal 

 swelling. Rostrum rather short, compressed, toothed above 

 only. Outer antennular flagellum not deeply cleft. Antennal 

 scale of good breadth. Mandible without palp. Second 

 maxilliped without ])odobranch. Third maxilliped narrow, 

 with vestigial arthrobranch. 



IV. Definitions of New Subgenera. 



The species of Peridinieaes fall into four groups, as 

 follow : — 



I. Rostrum toothless. No spines on trunk and legs Ensiger. 



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

 legs. 



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



supraorbital spine. J Corniger. 



B. Cornea not ogival. 



1. Upper edge of rostrinn convex. Second leg with 



short wrist, and unarmed save in one species. Supra- 

 orbital spine in one species onlj Cristiger. 



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 . . Falcu/er. 



