ISf) LTFE-niSTOllY OF THE COMMON NEMATODE OF Till': DOC4FISIJ. 



I have dissected a number of specimens of Pagurus hernhardus, 

 but have not found any larvae of Fvoleptns scillicola in them. 



Conclusions. 



The above experiments show that the larvae of ProJeptus scilli- 

 cola undoubtedly occur in Cai^cinus mcFuas, but my failure to 

 produce an artificial infection seems to point to the fact that 

 (Jarcinus is not the true intermediate host. 



It is possible, however, that (Jarcinus mcpnas may play some 

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

 normally occur at a less depth than thirteen fathoms, whereas 

 Carcinus imenas rarely occurs below a depth of three to four 

 fathoms. Durintj^ the breeding-season, iiowever, Dogfish come 

 close inshore, and it is prol)able that some of its infection takes 

 place at this season. 



TAterature. 



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



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

 Acad. 8c. Bruxelles, 1871. 



2. Beneden, P. J. van. — " Memoire sur les Vers intestinaux." 



Compt. Bend. Acad. Sc. Paris, Suppl. 1801, pp. 270-271. 



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



1875, p. 200. 



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

 Translation of 3. 1st English edition. London, 1875. 



4. Crepltnt. — S'piroptpriva claoHuUsy Arcliiv fiir Naturgesch. 



1851, p. 308. 



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



6. LiNSTOW, Dr. O. von. — Mitteilungen aus der Zoologischen 



Sammlung des Museums fiir Naturkunde in Berlin. 

 1 Band, 2 Heft. 



7. Ltnstow, Dr. 0. von. — Archiv fiir mikr. Anat. und Entwick. 



Band GO, 1902. 



8. LiNSTOW. Dr. 0. VON. — Archiv fiir Naturoesch. Berlin, 1890. 



Band 1, 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 m.cenas.'" Q.J. M.S. vol. vi. (new series), 

 1865, pp. 201-204. 



11. MoLTN, B.- Sitz. k. Akad. Wiss. 1860, pp. 512-513. 



12. Orley.— " Die Entozoen der Haien und Rochen." Termes- 



zetra.jzi Fiizetek, vol. ix., Budapesth, 1885, pp. 97-126 

 (fe pp. 216-220 {Hpirop. elegans). 



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



14. Vaullegeard, a. — Bullet. Roc. Linneenne de Normandie, 



4 scr. t. x., 1896, pp. 50-53, 



