126 BRITISH PARASITIC COPEfODA. 



maxillae small, somewhat similar in structure to those 

 of Hatschekia. First maxillipeds small, composed of 

 three joints, and provided with a small terminal claw; 

 second maxillipeds of moderate size, armed with 

 terminal claws, strong and cheliform. First four 

 pairs of thoracic legs short, biramose ; rami of the 

 first pair two- or three -jointed ; those of the third and 

 fourth pairs are usually both composed of three joints: 

 but though in the second pair the inner ramus is some- 

 what similar in structure to that of the next pair, the 

 outer one is more or less modified. Fifth pair con- 

 sisting each of a small uniarticulate lamina ; caudal 

 rami short. 



Male. — The male somewhat resembles the female, 

 but differs in being smaller and in the antennules being 

 armed with one or two moderately strong terminal 

 hooks. The second maxillipeds are not cheliform but 

 resemble in structure those in HatscheMa ; the outer 

 ramus of the second pair of thoracic legs is not modi- 

 fied, and there is also a difference in the form of the 

 caudal rami. Moreover the abdomen, including the 

 genital segment, is in the male nearly as long as the 

 cephalothorax. 



1. Eudactylina acuta P. J. van Beneden. 

 (Plate XXXVII, fig. 1 ; Plate XXXVIII, figs. 1-5.) 



1853. Eudactylina acuta P. J. van Beneden. (13b) Bull. Acad. Roy. 

 Belgique, vol. xx, pt. i, p. 235. 



1861. Eudactylina acuta idem. (15) p. 150, pi. xxv. 



1892. Eudactylina acuta Canu. (29) p. 52, pis. 2 & 3. 



1902. Eudactylina acuta T. Scott. (114) p. 293, pi. xii, figs. 20-25. 



1904. Eudactylina acuta A. Scott. (109) p. 40. 



Female. — Body slender and elongated ; the cephalo- 

 thorax consisting of five distinct segments, and the 

 abdomen of three, including the genital segment. 

 Cephalic segment about equal in length to the next 

 two segments combined ; the first of these two seg- 

 ments smaller than the second, the fourth and fifth 

 subequal. Abdomen small and only a little more than 



