8 Mr. P. W. Bassett-Smith on 



X 253. 4. Mandible, X 380. 5. Anterior foot-jaw, X . 380. 

 6. Posterior foot-jaw, X 380. 7. Foot of first pair of swimming- 

 feet, X 170. 8. Foot of fom-tli pair, X 170. 9. Foot of second 

 pair (male), X 170. 10. Foot of third pair (male), X 170, 

 11. Foot of fifth pair, X 170. 12. Foot of fifth pair (male), X 

 253. 12 «. Appendage of first aMominal segment. 13. Last 

 two abdominal segments and caudal stylets, X 125. 



(?) Canthocampttis imrvus, sp. n. 



Fig. 14. Female, side view, X 80. 15. Antennule, X 380. 16. An- 

 tenna, X 380. 17. Mandible, X 380. 18. Foot of first pair of 

 swimmiug-feet, X 253. 19. Foot of fourth pair, X 253. 

 20. Foot of third pair (male), X 253. 21. Foot of fifth pair, 

 X 380. 22. Foot of fifth pair (male), X 380. 



Maraenobiotus Vejdovskyi, Mrazek. 

 Fig. 23. Antennule, X 253. 



II. — Notes on the Parasitic Copepoda of Fish obtained at 

 Plymouth, with Descriptions of new Species. By P. W. 

 Bassett-Smith, F.Z.S., F.R.M.S., Surgeon R.N. 



[Plates III.- VI.] 



In taking up tins subject I am chiefly indebted to Prof. F. 

 Jeffrey Bell, wlio suggested it to me as being likely to prove 

 a fruitful and interesting investigation to fill up time while 

 stationed at Plymouth. This I the more willingly did, 

 having the kind assistance of the Director of the Marine 

 Biological Association's Laboratory and others there, to whom 

 I tender my best thanks. The greater part of the material 

 was, however, obtained by daily and diligent search at certain 

 fishmongers in the town. 



Although there are many admirable monographs and 

 treatises dealing with these curious and often bizarr e-XooYm^ 

 animals, they are chiefly of somewhat ancient date : the most 

 important are : — 



MiJLLER. * Entomostraca.' 1785. 



Otto and Btjbmeister. ' Nova Acta Natur. Curios.,' 1826. 1831. 



Keoyer. ' Naturhist. Tidsskrift,' 1838 and 1863. 



Milke-Edwaeds. Treatise, ' Crustaces,' tome iii. 1840. 



ISOBBMANN. ' Mikrographische der wirbellosen Thiere.' 1832. 



Claus. Monographs. 1860-1875. 



Carl Vogt. ' Archives Zoologie exp&'.,' tome xvi. 1877. 



Camil Heller. " Crustaceen," Reise der Fregatte Novara. 



Hesse. Monographs. 1862-1868. 



Van Beneden. ' Note sur un Crustace parasite uouveau, &c.' 1861. 



Baird. * British Entomostraca.' 1850. 



Geestaecker. " Copepoda," Broun's ' Thierrcich.' 



KuRZ. Monograph. 1877. 



