76 BRITISH PARASITIC COPEPODA. 



branches of the second and third pairs two-jointed, and 

 of the fourth pair one-jointed. 



1. Liitkenia asterodermi Glaus. 

 (Plate XIX, figs. 1-9 ; Plate XXIII, fig. 4.) 



1864. Liitkenia asterodermi Glaus. (33) p. 365-383, pi. xxxiv. 



1865. Cecropsina glabra Heller. (58) p. 209, pi. xix, figs. 1, 2. 



1906. Liitkenia asterodermi Norman & T. Scott. (88) p. 210, pi. xx. 

 figs. 9, 10; pi. xxiv, figs. 1-8. 



1906. Liitkenia asterodermi A. Brian. (21) p. 48. 



Female. Carapace suborbicular or obcordate, with 

 the posterior margin deeply hollowed out. Last 

 thoracic segment produced into a leaf -like bifurcated 

 dorsal expansion, the distal end forming two rounded 

 lobes which are separated by a tolerably deep and 

 narrow sinus ; the width of the plate at the proximal 

 end equal to about two-thirds the width of the cara- 

 pace; the anterior portion of the outer margin sloping 

 in a slightly arcuate line from the middle towards the 

 front corners which are distinctly angular. Genital 

 segment produced backwards into two contiguous lobes 

 which completely overhang and conceal the abdomen 

 and caudal rami, so that they can only be seen from 

 the ventral aspect. 



Abdomen somewhat lozenge-shaped, broader than 

 long, the length being three-fifths the width. Caudal 

 rami nearly contiguous, broadly lamelliform and 

 scarcely half as long as the abdomen. 



Antennules very small, second joint slender and 

 nearly as long as the first. Antennae armed with 

 strong hook-like terminal claws. First maxillipeds 

 slender and furnished with terminal claws, two of 

 which are small and subequal and the others rather 

 longer and stouter. Second maxillipeds large, basal 

 joint stout with one or two nodulous processes on the 

 inner aspect, the terminal claw large, strong, and 

 sickle-shaped. First pair of thoracic legs small, bi- 

 ramose, inner ramus minute, simple, and not half the 

 length of the first joint of the outer ramus. The outer 

 ramus two-jointed, the end joint very small, its distal 



