546 DISCOVERY REPORTS 



and whiter than the Controcaecum larvae, and are usually coiled up like watch-springs 



in disc-shaped or lenticular capsules (see Fig. 3 A), whereas the Contracaecwn larvae, 



B 



Fig. 3. A, part of a mass of Porrocaecum or Anisakis larvae 

 from Macruronus magellanicus; B, part of a mass of Coii- 

 tracaecum larvae from Notothenia loiltoni. 



though enclosed in sheaths consisting partly of old cuticles and partly of pigmented 

 peritoneal tissue from the host, are not usually coiled. 



Porrocaecum or Anisakis sp. 



Larval forms having a ventriculus like that of the adults of these two genera, but 

 without an intestinal caecum, occurred in similar situations in the following fishes: 



Gadus sp. 

 Cottoperca gobio 

 Coryphaena sp. 

 Macruronus magellaniciis 



Thyrsites atun 



Station WS 99, oflF the Falklands, together with Contracaecum larvae 

 Station WS 95, off the Falklands, together with Contracaecum larvae 

 Atlantic Ocean, 24° 05' N., 15° 46' W. 

 A large mass of specimens, with which a few Contracaecum larvae were 



mixed. Station WS 92, off the Falklands 

 Station 4, off Tristan da Cunha 



Two similar larvae, possibly of two species, were found in the stomach of a slender- 

 beaked dolphin {Sfeuo rostratiis), taken in the Atlantic Ocean, off the West African 

 coast not far from Cape Verde, October 27, 1925. 



