OHAKOPINUS DUBIUS. 191 



complex form of the anchoring arrangement of the 

 second maxillipeds, which are more slender in propor- 

 tion to their length ; their apices appear to be coalesc- 

 ent, and are fixed to a moderately large horizontal 

 appendage which is cartilaginous and of a brownish 

 colour. This appendage, when perfect, is somewhat 

 boat-shaped with the extremities slightly turned up ; it 

 has a resemblance to the cartilaginous bar clasped by the 

 enlarged apices of the second maxillipeds of Charopinus 

 dalmanni, but there the resemblance ends, for in that 

 species the ends of the second maxillipeds when freed 

 from the cartilaginous bar separate freely, whereas in 

 the species under consideration they remain fixed 

 together by a small hardened plug as in Lemseopoda , 

 and do not separate freely. The two pairs of antennas, 

 the mandibles, and other mouth-organs do not appear to 

 differ greatly from those of Charopinus dalmanni. The 

 ventral appendages at the posterior end of the genital 

 segment are also similar. Length of one of the larger 

 specimens : maxillipeds 11 mm., cephalothorax 6 mm., 

 genital segment 8'5 mm., posterior appendages 4 mm., 

 egg-strings 18 mm., and from the chitinic bar to which 

 the maxillipeds are fixed to the end of the posterior 

 appendages, 26 mm. 



No males of this species have been observed. 



Habitat. — Parasitic on the gills and gill-arches of 

 the cuckoo ray {Rata circularis) chiefly, and less fre- 

 quently on other skates, Firth of Clyde and Fish-Market, 

 Aberdeen (T. Scott). On Raia ftdlonica captured off 

 Dubh Artach (A. Scott). 



3. Charopinus ramosus Kroyer. 

 (Plate LV, figs. 6, 7 ; Plate LIV, figs. 18-22.) 



1863. Charopinus ramosus Kroyer. (71) p. 284, pi. xiv, fig. 5, a-i. 

 1901. Charojrinus ramosus T. Scott. (113) p. 130, pi. vii, figs. 17-23. 

 1904. Charopinus ramosus A. Scott. (109) p. 43. 



Female. — In this species the cephalothorax is not 

 deflexed in front of the bases of the second maxilli- 

 peds, but is projected forward as in Lemseopoda galei. 



