50 MISS MAY E. BAINBRIDGE OX 



measured from 7-8 mm.; the neck was not quite twice as long as the cephalothorax, 

 and the egg-sacs equal to the neck in length. As already stated, Olsson examined 

 a very large numher of specimens, and he says that in all these the specific characters 

 mentioned above were very constant. T. Scott's specimens measured 5 mm., and the 

 neck appears to be decidedly shorter than in Olsson's specimens. Scott found and 

 described the male ; but Olsson, although he examined such large numbers, never 

 saw a male. This point is interesting, as the simultaneous occurrence of the two sexes 

 varies considerably in different species. 



About twelve specimens of a Lemceopocla, all females, from the gills of Raia radiata, 

 were examined by me. These agreed closely with Scott's specimens in size and other 

 particulars, and are therefore placed under his species. 



The measurements are given below. 



The body of the female (fig. 24) was full of large ova. The ovaries (Ov.) are situated 

 on either side of the genital segment where the body begins to widen out below the 

 neck. The ovisacs are short, the ova being very large and apparently hexagonal in 

 shape owing to pressure. Some ova found in a shrivelled ovisac, which had shed most 

 of its contents, were found well-developed (January), the larva showing the abdomen 

 already developed and two pair of swimming-feet. There is a wide intestine (Lees.) full 

 of granules which seems to run straight frouithe mouth-tube, widening out in the genital 

 segment and narrowing again posteriorly. The genital openings are situated on the ven- 

 tral surface on two slightly raised knobs, between which lies tbe minute postabdomen. 



Mandibles (fig. 25). — Length - 13 mm. Slender, irregularly toothed. Pour large teeth, 

 between which are three very small ones. Following these seven teeth are four more, 

 which are very thin and delicate. Eleven teeth iu all. 



The organ of attachment by which the parasite is joined to its host is most remarkable ; 

 it will be described in detail in another paper on the organ of attachment in the family 

 of the Lenmeopodidoe. 



mm. 



Length of female (without posterior processes) 5 



„ process OS 



ovisacs (1) 2'6, (2) 2"8 



„ first maxillipeds and tenaculum 4 



Genus Brachiella, Cuvier. 

 Brachiella pastinaca, Van Ben. (PL 8. figs. 6, 7 ; PI. 9. fig. 8.) 

 185 1 . Brachiella pastinaca, Van Ben. Anuales des Sci. Nat. 3 ser. vol. xvi. p. 118, pi. 4. figs. 8-9. 

 1877. Brachiella pastinaca, Kurz, Zeitschrift fur wissenchaftliche Zoologie, Bd. xxix. p. 389, pis. 25, 



26, 27. figs. 2, 3, 36, 45. 

 1880. Brachiella pasti?mca, A. Valle, Bollet. d. Soc. Adriatica di Sci. Nat. in Trieste, vol. vi. 



fasc. 1, p. 77. 

 1904. Brachiella pastinaca, T. Scott, 22nd Ann. Hep. Pish. Board Scotland, iii. p. 278. 



A single specimen of what I take to be this species was found in the spiracle of the 

 Piked Dogfish (Acanthias vulgaris). P. J. Van Beneden's description and figures of 

 this species, which he obtained from the nostrils of the Sting Ray {Trygon pastinaca), 



