PARASITIC WORMS— LEIPER AND ATKINSON. 57 



Owing to the absence of suckers, Welch created a separate t^enns Abothros for his 

 specimen. Our material does not appear to differ from his species A. en rrlm ruts. 

 Welch merely states that the number of hooks on each rostellum is about 200. 



SUMMARY AND CONCLUSIONS. 



We now summarise the species that have been collected by the various Antarctic 

 Expeditions up to the present time. The species described as new in the corresponding 

 Reports are indicated by an asterisk. 



Ross's Antarctic Expedition, 1841-4. - species (both new). 

 CESTODA : 



*Dibothriocephalus antarcticus (Baird), 1853. 



* Taenia zederi, Bain], 1853. 



National Antarctic Expedition, 1901-4 ("Discovery"). 4 species (3 new, 1 previously known). 

 CESTODA : - 



Dibothriocephalus antarcticus (Baird), 1853. 



scotti, Shipley, 1907. 

 ,, wilsoni, Shipley, 1907. 



NEMATODA : 



* Leptosomatum australe. 



Scottish National Antarctic Expedition ("Scotia") L7 species (8 new, 5 previously known, 

 4 doubtful). 



CESTODA: 



* Dibothriocephalus scotlcus, Rennie and Reid, 1912. 



emits!, Rennie and Reid, 1912. 

 ,, antarcticus (Baird), 1853. 



„ mobilis, Rennie and Reid, 1912. 



* ,, pygoscelis, Rennie and Reid, 1912. 

 Anchistrocephalus microcephalia (Rud.), 1819. 

 Ifi/mnwlcpis sp. 1 



Phyllobothrium sp. ? 

 Tetrarhynchus sp. 1 



NEMATODA : 

 (parasitic) : 

 *Ascaris radiata, v. Linst., 1906. 



* „ rectangula, v. Linst., 190G. 



osculata, Rud. 1802. 

 ,, diiiineileae, v. Linst., 188S. 

 „ sp. '! 



^'Moiiori/ijiiKi drufniinii, v. Linst., 190(i. 

 (free living) : 



Thoracostoma setosum, v. Linst., 1896. 



ACANTHOCEPHALA :— 



*Echinorhy)ic7ms antarcticus, Rennie, 190G. 



