■I5f) LlKK-IirSTOKV OF THK COMMOX XliMATODE OF TUK DOGFISH. 



I have dissected a number of specimens of Pagarus hernhardus, 

 bnt have not foinid any larviie of Prolejytus scillicola in them. 



Conclusions. 



The above experiments show that the Lirvae of Proleptiis scilli- 

 cnla inidoubtedly occur in Carcinus ma'uas, but my fnihu-e to 

 produce an artificial infection seems to point to tlie fact that 

 (•arcinus is not the true intermediate liost. 



It is possible, however, that Carcimis mcenas may play some 

 part in the infection of the Dogfish. Scyllhim canicula does not 

 normally occur at a less depth than thirteen fathoms, whereas 

 Carcinus inmias rarely occurs below a depth of three to four 

 fathoms. Duriiig the breeding-season, however, Dogfish come 

 close inshore, an<l it is prolwxble that some of its infection takes 

 place at this season. 



Liter aUire. 



1. Bknedex, p. J. VAN.-— -"Les Poissons des Cotes de Belgique, 



leurs Parasites et leurs Commensaux," plate 38. Mem. 

 Acad. Sc. Bruxelles, 1871. 



2. Beneden, p. J. VAN. — " Memoire sur les Vers intestinaux." 



Compt. Rend. Acad. Sc. Paris, Suppl. 1861, pp. 270-271. 



3. Beneden, P. J. van. — Les Commensaux et leurs Parasites, 



1875, p. 206. 

 3a. Beneden, P. J. van. — Animal Parasites and Messmates. 

 Translation of 3. 1st English edition. London, 187r). 



4. CitEPLiN. — " S'piro'pterina dacnodes." Archiv f iir JSTa-tHrgesch. 



1851, p. 308. 



5. Du.TARDiN. — Histoire des Helminthes, 1845, p. 105. 



6. Ltnstow, Dr. O. vox. — Mitteilungen aus der Zoologischen 



Sammlnng des Museums fiir ISTaturkunde in Berlin. 

 1 Band, 2 Heft. 



7. LiNSTOW, Dr. 0. von. — Archiv fiir mikr, Anat. nnd Entwick. 



Band 60, 1902. 



8. LiNSTOW. Dr. 0. VON. — Archiv fiir Natur oesch . Berlin. 1890. 



Bandl, Heft 3, pp. 180-181, Tab. x.^figs. v.-viii. 



9. LiNSTOW, Dr. O. VON. — Achiv fiir mikr. Anat., Band 58. 



Bonn, 1901, pp. 191-194, Tab. ix. figs. 27-30. 



10. McIntosh, "W. C. — "The Trematode Larva and Ascaris of 



the Carcinus mwnas.''' Q.J. M.S. vol. vi. (new series), 

 1865, pp. 201-204. 



11. Molin, R.— Sitz. k. Akad. Wiss. 1860, pp. 512-513. 



12. Orley. — "DieEntozoen der Haien und Rochen." Termes- 



zetrajzi Fiizetek, vol. ix., Budapesth, 1885, pp. 97-126 

 & pp. 216-220 (jSpirop. elegans). 



13. Stossich. — Note Elminth. Trieste, 1893. 



14. VaulleCtEARd, a. — Bnllet. Roc. Linneenne de Normandie, 



4 sor. t. X., 1896, pp. 50-53, 



