lo STALK-EYED CRUSTACEA 



external antennae exposed on each side of rostrum. 

 {Mctoporaphis.) 



B. Rostrum very short and simple. 



b. No postocular spine. First 

 pair of legs with the palm inflated. 



c^. Rostrum acute, or rounded 

 and hood - shaped. Pterygostomian 

 regions naked, or with lamelliform 

 ridges defining afferent branchial 

 channels.— (/^(?,^(9r//^^7.) Fodochela. 



I. Leptopodia. 



Leptopodia . . Leach, H. Milne Edwards, Miers. 



IjiacJins . . . Fabricius. 



Cancer . . . Herbst. 



Macropc . . . Latreille. 



Stcriioryiiquc . Lamarck. 



The carapace, not tiiberculated, has the posterior 

 margin straight and not prolonged over the posterior 

 segment of the thorax. Rostrum very long, horizontal, 

 with the lateral margins serrated. Eyes short. A small 

 postocular spine present. The basal joint of the external 

 antennas is elongated ; the flagellum is in great part con- 

 cealed beneath the rostrum. The endostome is without 

 longitudinal ridges ; the epistome very large. The third 

 joint of the external maxillipedes is somewhat produced 

 at its antero-internal angle ; the fourth joint is obversely 

 triangulate, and truncated distally ; the fifth joint articu- 

 lates with it at its antero-external angle. 



The first pair of legs in the male is slender and 

 elongated, with the fourth and fifth joints and the hand 

 subcylindrical ; fingers much shorter than the palm, 

 toothed on their inner margins. The last joint of the 



