THE ANTHtTRIDJE 831 



Some eight genera are included in this family. The 

 first four to be mentioned agree in having two rounded 

 lobes to the lower lip, the mandibles with a cutting edge 

 of two or three blunt teeth and a sort of semicircular saw 

 in place of molar and spine-row, the ' palj) ' three-jointed ; 

 the first maxillae are simple, with apical teeth, without 

 ' palp ; ' the second are slightly cleft at the apex ; the 

 maxillipeds have from three to six broad flattened joints 

 including the basal piece. 



Anthura, Leach, 1814, has the flagella of both pairs of 

 antennae few-jointed in the female, of the first multi- 

 articulate in the male ; the maxillipeds three-jointed ; the 

 first five pleon-segments fused in the female, partially 

 distinct in the male. The telson is not coalesced with the 

 preceding segment. 



Gliathura, Norman and Stebbing, 1886, has the flagella 

 of both antenn® rudimentary, of the first perhaps not 

 greatly developed in the male ; the maxillipeds four- 

 jointed ; the first five pleon-segments fused, at least dor- 

 sally, in the female. 



Anthelura, Norman and Stebbing, 1886, has the flagella 

 of both antennae multiarticulate, of the first pair brush- 

 like in the male ; the maxillipeds six-jointed ; the pleon- 

 segments distinct, and the telson in the type-species 

 separate from the sixth segment. 



Hyssura, Norman and Stebbing, 1886, has the flagella 

 of both antennee multiarticulate; the maxillipeds six- 

 jointed ; the seventh segment of the perseon seemingly de- 

 void of limbs ; the first five pleon-segments distinct, fully 

 half as long as broad ; the pleopods alike, the first pair not 

 covering any of the following ; the uropods with the outer 

 branch long and narrow, not arching over the narrow 

 lanceolate telson. The animal is vermiform. 



Msothistos, Haswell, 1884, has both antennae very 

 short in both sexes with few- (8-6) jointed flagella; the 

 first gnathopods not subchelate, smaller than the following 

 limbs; the first five pleon-segments short but distinct; 

 the first pleopods covering the rest; the uropods with 

 outer branch narrow, not arching over the broad quadrate 



