228 STALK-EYED CRUSTACEA 



I. Trichodactylus. 



Trichodactyliis . . H, Milne Edwards, A. Milne Ed- 

 wards, Ortmann, Rathbun. 



The carapace suborbicular ; lateral teeth, when present, 

 small, appressed. Lower margin of orbit and buccal angle 

 unarmed or feebly tuberculate. Eyes very small, diminish- 

 ing in size at terminal half. Last' joint of walking legs 

 narrow, awl-shaped, cylindrical, covered with a velvet- 

 like down. 



Synopsis of the Species. 



A. Lateral border of carapace has five teeth, not 

 counting the external orbital angle. — (7^. qiihiqiiedeii- 

 taius^ 



B. Lateral border of carapace has four teeth, not 

 counting the external orbital angle. — (7". dentatus) 



C. Lateral border of carapace has no teeth. — {T. 

 qiiadratus^ 



I. Trichodactylus quinquedentatus. 



Trichodactylus quinquedentatus . . . Rathbun. 



Carapace very convex longitudinally, slightly convex 

 transversely. Surface smooth, shining, punctate, the 

 punctse irregular in size and numerous. There is an Pi- 

 shaped depression in the centre of the carapace. The 

 front consists of two broad lobes. External orbital angle 

 obtuse. Lateral margin strongly bowed, armed with five 

 teeth, besides the external orbital tooth, the first three 

 sharp and spiniform, the last two blunt. Carapace widest 

 at the fourth tooth. Frontal, orbital, and lateral margins 

 ridged and smooth. Outer margin of fourth joint of 



