NEMATODA 547 



Contracaecum spiculigerum (Rud., 1809) 

 A large number of specimens of this extremely common and cosmopolitan species 

 were collected from the stomach of a cormorant (P/ialacrocorax magellaniciis) at St 

 Martin's Cove, Hermite Island, Cape Horn (Station 222). 



Contracaecum clavatum (Rud., 1809) 



Adult or immature specimens which are referred to this species were collected on 

 about six occasions from the stomach or intestine of Merliiccius sp. at various places 

 off the Falkland Islands (Stations WS 73, 90, 96, 99). 



These worms are rather small, as compared with specimens of C. clavatum from hake 

 and cod in northern latitudes, and the males have shorter spicules, but a specific 

 distinction does not seem justifiable. 



A single small male, apparently of the same species, occurred in the intestine of 

 Stromateus sp. at Station WS 78, and an immature specimen in the stomach of Gadus sp. 

 at Station WS 99 (both off the Falklands). 



Contracaecum rectangulum (v. Linstow, 1907) 

 A number of specimens of this species, of various ages, occurred among the stomach 

 contents (chiefly Cephalopod remains) of a sea-leopard {Hydrurga leptonyx) in the 

 South Sandwich region, January 22, 1928. 



Immature forms, probably also of this species, were collected from the intestine of 

 another sea-leopard at Station 184, March 15, 1927, and from the stomach of a crab- 

 eater seal (Lobodon carcinophagiis) at Station 187, March 18, 1927. Both these stations 

 were in the Palmer Archipelago. 



Contracaecum zenis, sp. n. 



(Fig. 4) 

 Four adult females from Zeus capensis off South-west Africa, July 8, 1927. The worms 

 are stated to have been found in the body-cavity, but had probably escaped from the 

 alimentary canal. The length of the specimens varies 

 between 55 and 70 mm., and the maximum thickness 

 reaches 1-5 mm. The cuticular striations are fine (about 

 0-005 mm. apart). The dorsal lip has wide cuticular 

 expansions laterally, and the anterior lobes of the pulp 

 have inwardly-directed processes. There are deep in- 

 cisions at the bases of the lips. The cervical alae are 

 well developed. The oesophagus is 7 mm. long. The 

 ventriculus measures, in the largest specimen, about 

 0*25 mm. in length and 0-3 mm. in width. In this 

 specimen, the intestinal caecum extends forward to a 01 MM 



point about 2-5 mm. from the anterior extremity, and Fig.4. Contracaecum ,enis. Dorsal 

 '^ '' .... , ri-ii lip of female, external aspect. 



the oesophageal appendix is about 2-3 mm. long. The 



cervical papillae are situated at i-i mm., and the nerve-ring at 0-9 mm., from the anterior 



