42 BRITISH COPEPODA. 



spinulosa have not been seen ; but the points of differ- 

 ence, as shown in the plates, seem to me to be too 

 well marked to allow of the two forms being brought 

 under one specific name. 



Genus 12. DELAVALIA, Brady (1868). 



Delavalia, Brady. Nat. Hist. Trans. Northumbei-land and Dur- 

 ham, vol. iii (1868). 



Animal like Dactylopus in general form ; rostrum 

 short and blunt, abdomen of the female 5-, of the male 

 6-jointed, tail-segments distant and rather divergent : 

 anterior antennae shorter than the first body-segment, 

 in the male hinged (Plate LI, fig. 3), but destitute of 

 a vesicular swelling, 8-jointed; inner branch of 

 posterior antennas composed of two or three joints ; 

 mandibles well developed, basal joint of the palp large, 

 and giving origin to two long, slender, 1 -jointed 

 branches. Maxillar palp well developed, multilobular ; 

 first foot-jaw composed of several digitiform seg- 

 ments, a small marginal 2-lobed palp, and a long 

 terminal claw. Second foot-jaw forming a slender 

 clawed hand. All the branches of the four pairs of 

 swimming-feet 3-jointed, except the inner branch of 

 the first pair, which has only two joints. Basal joint 

 of the fifth pair of feet very short and broad, second 

 joint leaf-like, ovate or subovate ; ovisacs two, large, 

 and containing a small number of large ova. 



