472 WILLIAM NICOLL. 



Family (ACANTHOCHASMIDAE). 

 Genus Acanthochasmus Looss. 

 38. A. imhutiforniis (Molin). 



DISTOMATA GASTEEOSTOMATA. 



Family BUCEPHALIDAE. 



Sub-Family Bucephalinae. 

 Genus Bucephalus Baer. 



39. B. minimus (Stossich) 



Genus Bucephalopsis (Diesing). 



40. B. gracilescens (Bud.). 



Genus Rhipidocotyle Diesing. 



41. R. mini'ma (Wagener) 



42. R. viperae (v. Ben.). 



Sub-Family Prosorhynchinae. 

 Genus Prosorhynchus (Odhner). 



43. P. crucihulum (Bud.). 



44. P. aculeatus Odhner. 



45. P. triglae sp. inq. 



46. P. squamatus Odhner. 



MONOGENEA. 



Genus Microcotyle v. Ben. & Hesse. 



47. M. draconis Briot. 



Genus Axine Abildgaard. 



48. A. helones Abildg. 



Genus Octobothrium F. S. Leuckart. 



49. 0. merlangi (Kuhn). 



Genus Octocotyle Diesing. 



50. 0. scombri Kuhn. 



