256 STALK-EYED CRUSTACEA 



II, The abdomen of the male completely conceals the 

 sternum at the base. — (Sect. CarcinoplacincB^ 



3. Ocular peduncles short and robust. — {Gcryon?) 



4. Ocular peduncles elongated. — {Frevilka^ 



5. Ocular peduncles small, and without cornea. — 

 {Bathyplax) 



Section I. Euryplacinae. 



EuryplacincB .... Stimpson, Miers. 



EucratopsitKE . . . . Stimpson. 



The antero-lateral margins of the carapace are dentate 

 or spinose; the abdomen in the male does not entirely 

 cover the sternum at the base. 



I. Euryplax. 

 Euryplax .... Stimpson. 



Carapace broad ; antero - lateral margin very short, 

 dentate ; facial region of less width than the carapace ; 

 front nearly half as broad as the carapace ; ocular 

 peduncles of moderate length ; external antennae excluded 

 from the orbit by the internal suborbital lobe, which joins 

 the front. External maxillipedes with the fifth joint 

 articulated to the short fourth joint at its truncated inner 

 angle. Palate with a distinct ridge on each side defining 

 the efferent channel. First pair of legs large and thick ; a 

 circular pit on the front side of its fourth joint near its 

 extremity. Walking feet compressed ; terminal joint of 

 posterior pair short and compressed. 



Verges of the male arising from the coxae of the 

 posterior feet, and passing to the abdominal appendages 

 through canals in the sternum. Basal joints of the 



