322 



PLASMODROMATA AND SARCODINA 



Vahlkamfia lobospinosa Craig, 1912. 



Synonym. — Amceba lobospinosa Craig, 1912; V. withmorei 

 Hartmann, 1912. 



This amoeba was cultivated from a dysenteric stool from a patient 

 in Manila in 1905, and first described by Musgrave and Clegg. In 

 IQ12 it was studied by Craig and called Amceha lobospinosa, also by 

 Williams and Calkins, by James, by Liston, and by Wells. 



James, in the Canal Zone, obtained this amoeba for a considerable 

 period from the faeces of a patient which were guarded against con- 

 tamination, and hence it must be admitted that it can live for a 

 time in the intestine of man, but it is probably non-pathogenic. 



On the other hand, in all the other reported cases it has occurred 

 as an aerial contamination of the fseces or pus in which it has been 

 found. It was first cultivated by Musgrave and Clegg. 



Other Species. 



In 1917 Kuenen and Swellengrebel divided the species of Limax 

 amcehcB into three types, the Limax, the Endolimax, and the Pseudo- 

 Umax ; but taking V .Umax Dujardin, 1841, emendavit Vahlkamf, 

 1904, as the type species, and allowing that V. lacustris Naegler, 

 1909, is the same species, the following are known: 

 A Small forms, 3-15 microns : — 



Cysts 1*5 microns in diameter— F. Umax Dujardin, 



1841, emendavit Vahlkamf, 1904. 

 Cysts over 7 microns in diameter. 

 {a) Karyosome surrounded by a peripheral row of 

 chromatin granules — V . lacertcB Hartmann, 1907. 

 {b) Karyosome not so surrounded — V . froschi Hart- 

 mann and Prowazek, 1907. 



, B. Medium-sized forms, 15-30 microns : — 



{a) Trophozoite binucleate — -V. diploidea Hartmann 



and Naegler, 1908. 

 (&) Trophozoite uninucleate : — ■ 



1. Contractile vacuole present — V. tachypodia 



Glaeser. 1912. 



2. Contractile vacuole absent — V. polypodia 



Schutze, 1875. 



C. Large forms reaching to 50 microns : — 



{a) Trophozoite binucleate- — V. binucleata Gruber, 

 1884. 



(b) Trophozoite uninucleate : — ■ 



1. Ectoplasm like a lamella — V. lamellipoda 



Glaeser, 1912. 



2 . Ectoplasm not so distinct : — 



(1) Nuclear division pr omit otic — V. albida 



Naegler, 1909. 



(2) Nuclear division mesomitotic — V. guttula 



Dujardin, 1912. 



