STALK-EYED CRUSTACEA 37 



horizontal horns. The eyes are small. The orbits are 

 directed outwards and downwards, but the floor of their 

 cavities is very incomplete. The basal joint of the 

 external antennae is straight, and without remarkable 

 spines at its extremity. The flagellum is inserted under 

 the rostrum, and is in great part hid by it. The third 

 joint of the external maxillipedes is prolonged in front ; 

 the fourth joint is longer than wide, and dilated exter- 

 nally ; it is not auriculated. 



The first pair of legs is long, especially in males, and 

 the pincers are strongly curved inwards, toothed, and 

 pointed. The walking legs are cylindrical; those of the 

 third pair are of moderate length, but the second pair is 

 very long ; in the male these legs are in general one and 

 a half or twice as long as those of the third pair. The 

 sternal plastron is longer than wide. The abdomen is 

 seven-jointed. 



Range. — West Indies, Coromandel Coast, Seas of 

 Asia ; in deep water. 



I. Chorinus heros. 



Choriuns Jicros . Herbst, H, Milne Edwards, Leach, 



Desbonne and Schramm. 

 Maia heros . . Bosc. 

 Pisa heros . . . Latreille. 



The carapace is almost twice as long as broad, and 

 convex above ; the gastric region is very large, swollen, 

 and tubercular anteriorly ; branchial regions slightly 

 dev^eloped, and almost smooth. Rostrum very long. 

 The anterior and superior angle of the orbit has a large 

 horizontal spine ; antero-lateral borders armed in front 

 with two round teeth. 



First pair of legs of the male twice as long as the 



