173 



Dr. O'Brycn BelHngliam un Irish Entozoa. 



pCEsophagus of Cohjmbus septentrionalis. 

 I CEsophagus and crop of kittiwake gull {La- 



23. Ascaris variegata <( rns tridacti/lus). 



I CEsophagus and crop of razor-bill (Alca 

 [_ Torda). 



„ . , ^ 7 . r Stomach and intestine of trout (Salmo 



24. obtusocaudata "^ ry, • \ 



25. labiata . , Intestines of eel {Angtiilla acutirostris^. 



'Peritonaeum of herring (Clupea Harengus). 



Peritonaeum of lump-fish {CyclopterusLum- 

 pus). 



Peritonaeum and intestine of salmon (^Sal- 

 mo Salar). 



Peritonaeum of cod (Gadus Morrhua). 



Peritonaeum of whiting (Merlangus vul- 

 garis). 



Peritonaeum of hake (Merliiccius vulgaris). 



Peritonaeum of ling {Lota Molva). 



Peritonaeum of holibut {Hippoglossus vul- 

 garis). 



Peritonaeum of turbot (Pleuronectes maxi- 

 mus). 



Peritonaeum of conger-eel(^«p'?/27/flCoMp'er). 



Peritonaeum of frog-fish {Lopkitis piscato- 

 rivs). 



Peritonaeum of gurnard (?>/</ /a Gurnardus). 



Peritonaeum of mackerel (Scomber Scom- 

 ber). 



Peritonaeum of Y>'ipe-fish(SgngnathusAcus). 



Stomach, intestine, peritonaeum and gall- 

 bladder of dog-fish (Squalus Acanthias). 



, ^ .. /^ ^■ \ \ Small intestine of ffolden plover 

 heteroura (Lreplm) < /^, , . , .°,. x ^ 

 l {Cnaradnus pluvial/s). 



28. ■ cuneiformis. Intestine of gudgeon (Cyprinus Gobio). 



26. 



capsularia* < 



27. 



* The Ascaris capsularia is mentioned by Rudolphi as occurring 

 only in a single species of fish (the salmon), Avhereas I have found 

 it in jiftee7i different species ; it inhabits almost exclusively the peri- 

 tonaeum. This species is very common in the peritonaeal cavity of 

 the herring (Clupea Harengus) ; it is exceedingly active, and so tena- 

 cious of life, that I have kejjt it alive in a vessel of fresh water for 

 twenty-nine days. The three tubercles which surround the mouth 

 are very small ; the whole tract of the intestinal canal can be seen 

 through the parietes when the animal is alive, but there is no ap- 

 pearance of a convoluted ovary surrounding it. The stomach is 

 whiter and more opake than any other part of the alimentary canal, 

 and is visible through the parietes as a longitudinal white and short 

 line, which is very characteristic of this species. 



