104 BRITISH PARASITIC COPEPODA. 



front of the carapace. Other appendages somewhat 

 similar to those of the female. 



We are indebted to Major E. Y. Elwes, Babbacombe, for the 

 privilege of examining and describing the male, he having 

 kindly sent it to us for that purpose along with specimens 

 of the female. 



Philorthragoriscus serratus (Kroyer). 



(Plate XXIV, figs. 3, 4; Plate XXVII, figs. 11-24.) 



1863. Dinematura serrata Kroyer. (71) p. 176, pi. viii, fig. 4 a—i. 

 1897. Philorthragoriscus serratus Horst. (63a) Notes Leyden Museum, 

 vol. 19 N. |, Note xiv, p. 137, pi. vii. 



1901. Dinematura serrata T. Scott. (113) p. 125. 



1906. Philorthragoriscus serratus A. Brian. (21) p. 53. 



1907. Philorthragoriscus serratus C. B. Wilson. (147) p. 479, pis. 

 xlii & xliii. 



1909. Philorthragoriscus serratus E. V. Elwes. (45) p. 20. 



Female. — Carapace, which is generally described in 

 the generic definition, with the lateral margin denticu- 

 late. The antero -lateral corners of the dorsal plates of 

 the fourth segment produced outward into sharp teeth, 

 and both lobes with their posterior margins also denti- 

 culate. The outer ramus in the first four pairs of 

 thoracic legs considerably larger than the inner, the 

 first joint being longer than the entire inner ramus, and 

 having a small tooth on its outer distal angle ; the end 

 joint small and bearing a few small spines and setse on 

 its rounded apex ; the joints of the inner ramus sub- 

 equal, and the end joint somewhat expanded and 

 furnished with three apical setse. Basiopodites of 

 the second and third pairs dilated, rami small. The 

 basiopodite of the fourth pair also considerably en- 

 larged, and both rami small, uniarticulate, and some- 

 what rudimentary, but the inner much smaller than the 

 outer ramus. Egg-strings long and slender. Colour 

 yellowish. Length about 7 mm. 



Male. — See under generic definition. Length 5 mm. 



Habitat. — Taken on a short sun-fish, Orthagoriseus 

 mola (L.), at Banff in 1862 by the late Thomas 

 Edward. On a short sun-fish captured off Berry 

 Head, 1898 (E. V. Elwes). 



