204 STALK-EYED CRUSTACEA 



Front horizontal or sloping, without superior frontal 

 border. Fourth joint of external maxillipedes triangular ; 

 fifth joint articulates with it at anterior external angle. 

 Last joint of walk-ing legs not armed with spines. — 

 ( TricJiodactylimv^ 



Subfamily L Pseudothelphusinae. 



Pseiidotlielphusincc 

 Pot a vwcaixin idcE 

 PseiidothelpJiusida 

 Bosciadce . . . 

 Bosciaava . 

 Boscia (genus) . 



Ortmann, Rathbun, 



Ortmann. 



Rathbun. 



Smith. 



Milne Edwards. 



LL Milne Edwards. 



Carapace oval from side to side; margins toothed 

 or tuberculate, sometimes very minutely. Epigastric 

 lobes and cervical sutures present. Median furrow 

 usually present. Front inclined, generally bilobed, either 

 straight or slightly arched, and with or without a superior 

 frontal border. An inner suborbital lobe, distinct from 

 the orbital margin, is always present, and is either 

 separated from the front by the width of the flagellum, 

 or, when united with the front, permits the passage of 

 the flagellum behind it into the orbit. 



The fourth joint of the external maxillipedes is 

 broader than long, with the outer margin arcuate from 

 the articulation of the second to the insertion of the fifth 

 joint, or forms an antero-exterior angle with the anterior 

 margin ; posterior margin usually as wide as the anterior 

 margin of the third joint. Its form is subquadrangular 

 or subtriangular ; the fifth joint joins it at its anterior 

 inner notch, and is not hid behind it. The third joint 

 has no longitudinal furrow. The external appendage 



