STALK-EYED CRUSTACEA rg 



than long. Postocular spine long, with rounded end. — 

 (A rac/mopsis.) 



t'*. Fourth joint of external maxillipedes j . 



L-shaped. Postocular spine long and sharp. — ^\ 



{EuprognatJia}) y 



c^. The division between the horns about ( 

 as broad as the length of the horns ; no spine 



Aiiasiiitits. 



m centre of notch. 



f^. Postorbital spine small. — {Trachy- 

 maia.) 



c. Rostrum much longer than broad at I' 

 base. ( 



d}. External antennas exposed on a dorsal n~- 



V 

 view. 



Arachnopsts 



d^. Carapace subpyriform, almost as broad 

 as long. 



g*. Fourth joint of external maxillipedes 

 elongated and rounded distally. — {Lispog- ( 

 nath/s.) 



e^-. Carapace subpyriform, longer than Trachymaia. 

 broad, with lateral spines. 



/<!*. Fourth joint of external maxillipedes ))L 



with the antero-external angle dilated, in- f 

 ternal angle truncated. — {Ajiaviathia^) i ,, 



i^. Fourth joint of external maxillipedes ^ ■ . // 

 deeply notched distally where the fifth joint 

 articulates. — {Nibilia?) 



f'^. Carapace subtriangular, without lateral 

 spines. ;^ 



j^. P'ourth joint of external maxillipedes '■\^ 



with antero - internal angle notched, antero- 

 external angle dilated.— (C/z^/vVm.?.) Anamaihia. 



