SOME PAEASITIC COPEPODA. 57 



Anchorella uncinata, Miiller (variety from the fins of the Cod). (PL 11. figs. 43-4G.) 

 (For synonymy and literature, see Bassett-Smith, op. clt. 1899, p. 505.) 



Two females of what seems to be a variety of Anchorella uncinata, Miiller, 

 were obtained from the fin of a Cod ( Gadus morrhua). 



General Appearance (female). 



The animal is somewhat flattened and is invested by a loose bag-like membrane 

 (fig. 43). On the fin of the host where the parasite is attached is a large oval 

 swelling (s.). The tenaculum is deeply imbedded in this swelling, only a small portion 

 of the end of the chitinous stem being free. The two arms (first maxillipeds) are 

 short but distinct, and are only united at the base of the stem of the tenaculum. Two 

 glands opeu to the exterior on the transparent investing membrane close to the base of 

 the arms. Similar glands are present in the common form of this species. The 

 genital segment shows traces of three segments ; the third is separated from the 

 preceding segment by a deep indentation at the sides. Prom this segment the pear- 

 shaped abdomen projects beyond the posterior margin of the body ; it is borne on a stalk 

 (p.ab.). The cephalothorax lies close to the genital segment and is moderately stout, 

 increasing in thickness towards the head. In the larger of the two specimens it is a 

 little longer than the genital segment, in the smaller considerably longer. On the 

 sides at the end of the abdomen are two openings with thickened edges : two tubes can 

 be seen running down the abdomen to open at these points. 



The tenaculum will be described in another paper. 



The appendages are the same as in A. uncinata, Miiller. This variety differs 

 considerably from the common form in its general appearance, being much flatter, and 

 in the position of the cephalothorax. The curious pear-shaped swelling on the fin of 

 the host is remarkable, as the common form of Anchorella uncinata does not seem to 

 produce this swelling. 



mm. 



(1) Length of female 3 



(2) „ „ 2 



Anchorella stellata, Kroyer. (PI. 11. figs. 38-42.) 



1838-39. Anchorella stellata, Kroyer, Naturh. Tidssk. Itekke 1, vol. ii. p. 142, pi. 3. fig. 5. 

 1864. Anchorella stellata, Kr. op. cit. Riekke 3, vol. ii. p. 383. 



1900. Anchorella stellata, T. Scott, 18th Ann. Rep. F. B. Scot. iii. p. 178. 



1901. Anchorella stellata, T. Scott, op. cit. 19th, p. 134, pi. 8. figs. 1, 2. 



This species was first described by Kroyer, and T. Scott gives a description of it (1900) 

 and some figures (1901). As the species is very interesting, I give a few more notes and 

 some drawings. 



Eve specimens were found on the skin of a Hake {Merluccius vulgaris, Linn.) 

 near the pectoral fin. They were all females and without ovisacs. The Hake was 

 purchased at Sheringham, Norfolk. 





