CALIGUS BREVICAUDATUS. 57 



one intermediate in length to the others. Length 

 about 5*3 mm. 



Habitat. Parasitic on Trie/la gurnardus and Trigla 

 lucerna. Found adhering to the inside of the mouth 

 of a grey gurnard captured in the vicinity of Piel, 

 Barrow-in-Furness, in August lyOl. Found also on 

 the inside of the gill-covers of sapphirine gurnards 

 taken in Luce Bay in October 1910 (A. Scott). 



No males have been observed. 



Tliis species resembles Caligus curtus in general appear- 

 ance, but differs in the form of the genital segment, in the 

 very short abdomen and caudal rami, and in the structure 

 and armature of the fourth pair of thoracic legs. 



9. Caligus pelamydis Kroyer. 



(Plate VII, figs. 2, 3 ; Plate IX, figs. 1-5 ; Plate 

 LXXI, fig. 14.) 



1863. Caligus pelamydis Kroyer. (71) p. 50, pi. iv, fig. 4 a-g. 

 1896. Caligus scomberi Bassett- Smith. (6) p. 11, pi. iii, fig. 2. 

 1901. Caligus scomberi T. Scott. (113) p. 148, pi. v, figs. 9, 10. 



1905. Caligus pelamydis C. B. Wilson. (145) p. 594, pi. xiii, figs. 

 154-161; pi. xiv, fig. 116. 



1906. Caligus scomberi A. Scott. (110) p. 52, pi. vi. 

 1906. Caligus pelamydis Norman & T. Scott. (88) p. 206. 

 1910. Caligus pelamydis T. R. R. Stebbing. (125) p. 558. 



Female. Carapace suborbicular, length and width 

 about equal and rather more than one-third the total 

 length of the animal, lateral margins slightly arcuate ; 

 frontal plates tolerably large, lunulae also of moderate 

 size but not very prominent. Free thoracic segment 

 short, narrow, somewhat dilated. Greiiital segment 

 ovate, equal to fully two- thirds the length of the 

 carapace, lateral margins nearly straight distally, but 

 rounded and converging towards the anterior end, 

 posterior margin truncated, postero-lateral angles 

 rounded. Abdomen narrow, about as long as the 

 genital segment, indistinctly biarticulated, end joint 

 short and rather narrower than the elongated proximal 

 one. Caudal rami short and provided with several 

 short plumose setas. 



