NEMATODE GENUS PHYSALOPTERA. 1003 



to Uganda in 1906. I wish here to express my indebtedness and 

 thanks to the Zoological Society of London for the honour and 

 privilege of collecting these parasites in their Gardens, and to 

 Professor Leiper my sincere thanks and gratitude for having 

 entrusted me with his material, for his valuable advice and 

 criticisms, without which the work could not have been under- 

 taken, and for the use of his valuable library. 



In addition to the above material, the writer was able to 

 examine representative material of all of Molin's species, the 

 types of two of Diesing's species, and examples of six of Rudolphi's, 

 including his types of Ph. clausa deposited in the Helminthological 

 collection of the Zoologische Abteilung der Naturhistorischen 

 Staatsmuseum, Vienna. I wish to express my indebtedness and 

 thanks to Hofrat Dr. Ludwig von Lorenz-Liburnau, Director of 

 the Zoological Department, for the privilege afforded me to 

 examine this material, and especially also to Dr. Carl Graf 

 Attems, custodian of the Helminthological collection in the 

 Museum, for the excellent facilities so generously placed at my 

 disposal. 



Molin did not set apart any material of his species as types, 

 neither did von Drasche when re-examining Molin's material. In 

 consequence of this, I have taken the bottle with the lowest 

 number to represent the type, except in the case of Pli. obttisis- 

 sima and Ph. terdentata. In the former case a paratype of the 

 species was examined ; in the second case the bottle with the 

 lowest number did not contain Molin's species, but a repre- 

 sentative of a later-described species of von Linstow's, namely 

 Ph. prceputialis ; consequently a bottle without any regular 

 number upon it, but with the legend Y1074 on the stopper, was 

 taken as the type; this material had been determined by Molin 

 and also redetermined by von Drasche. The number of the 

 bottles containing what I have taken as the type materials of 

 Rudolphi's, Diesing's, and Molin's species are recorded under the 

 description of the individual species concerned. 



The types of the two new species, Ph. phrynosoma and 

 Ph. capensis, described in this paper will be deposited in the 

 British Museum of Natural History. The types of the live other 

 new species, Ph. gracilis, Ph. longissiina, Ph. simplicidens, 

 Ph. malayensis, and Ph. honnei, are in the Helminthological 

 Department of the London School of Tropical Medicine. 



Methods of Study. 



The fresh material obtained from the Prosectorium of the 

 London Zoological Society was collected and w^ashed in normal 

 saline, and as much as possible of the structure of the worms 

 determined while they were still in the living state. They were 

 then killed in hot 70 per cent, alcohol, according to the method 

 recommended by Looss, after which they were pi-eserved in a 

 70 per cent, alcohol -f 5 per cent, glycerine solution. For 



