54 MISS MAY E. BAINBEIDGE ON 



segmentation of this appendage is indistinct, but traces of two joints on the main stem 

 below the inner branch can be seen. 



Second Maxillce (PL 10. fig. 18). — Very indistinctly segmented, traces of three joints 

 can be made out, the last bearing a short simple claw ; below this on the inner margin 

 of the same joint is a delicate short seta. Between the two appendages, at their base, 

 are two small raised folds. The outer free margin is much longer than the inner, so that 

 one appendage could not be dissected without tearing the other. The structure of these 

 appendages is peculiar and unlike those of other species of Brachiella. There was no 

 claw on the left appendage — it may, however, have been accidentally destroyed. 



mm. 



Length from top of arms to end of abdomen 9 - 2 



„ from end of head to extremity of attachment 19 



,, of arms 14"5 



„ of body from bend of neck to end of abdomen 8 



„ of head to bend of neck 5*3 



„ of process 4 



Width of neck 15 



„ of genital segment 5 - 2 



This species seems to be nearly allied to, if not identical with, Brachiella parkeri, 

 Thompson {op. cit.), from the gills of Maia nasuta and also a Stingaree [Trygon sp. ?), 

 Otago Museum, but it differs from it in several particulars. 



There is some difference in the size. The following are Thompson's measures of 

 Brachiella parkeri : — 



mm. 



Head and thorax 8 



Length of arms 17 



,, genital segment 11 



Width 7 



Length of process 10 



Total length of animal from bend of thorax 12 



On a comparison of these figures it will be seen that my specimen is considerably 

 smaller, but it was without ovisacs and is probably a young female. Thompson, in his 

 brief account of this parasite, mentions and figures a pair of " maxillary palps " at the 

 base of the rostrum ; these appendages were not observed in the form now described. 

 The great length of the posterior processes, 10 mm. as compared with 4 mm. in the 

 British form, should also be noted. But, on the other hand, the position of the head in 

 a " nearly continuous line with the arm-like appendages and bent at right angles to the 

 genital segment" is very characteristic of my specimen. Also Thompson's description 

 of the first maxillipeds (he calls these appendages "second maxillipeds "), as "conical 

 protuberances which show no distinct segmentation" and which are situated "about 

 three millimetres from the extremity of the cephalothorax," applies closely to the 

 structure and position of these appendages in the form from the Long-nosed Skate. I 



