282 II. LYXDHIJEST DUKE. 



He showed tliat a very definite aniso^ainy was visible iu tlie 

 living cysts, wliicli, however, became much less marked in 

 the process of fixing and staining. This may be so in 

 Metamera schubergi, but, considering isogamy as the 

 more primitive condition, it is possible that this gregarine, 

 whose first spindle suggests a phase in the evolution of 

 karyokinesis, may also exhibit true isogamy. 



T hope in the spring to renew my acquaintance with this 

 species, and to be able to complete its life-history. 



Diagnosis of Metameka schubergi n.g., n.sp. 



A cephaliue gregarine belonging to the faiuily Dactylo- 

 phoridfe (Leger).^ Ti-ophozoite ca. 150 /u by 45/<. Epimerite 

 subconical, with apex excentrically placed, and surrounded 

 by nuijierous branched, digitiform appendages. The deuto- 

 merite sometimes (not always) shows a secondary septation 

 into one to three segments in the i*egion posterior to the 

 nucleus. Conjugation isogamous, no sexual differentiation 

 being observable at any stage in the life-cycle. Cyst dehisc- 

 ing by simple rupture. Spores navicelliform, containing 

 eight sporozoites, and measuring 9 /i by 1 fx. 



Hosts: Glossosiphonia complanata (Heidelberg and 

 Cambridge) and Hemiclepsis margin at a (Heidelberg). 



Guy's Hospital, 

 London, S.E.. 



Fehinuiry, 1910. 



Literature. 



1. Berndt. A. — '* Beitrag zur Keuntiiis der im Danne der Larve von 



Tenebrio molitor lebenden Gregarinen," 'Arch. Protistenk.,' 

 Bd. i. 1902. 



2. Bolsius. H. — ' Ann. Soc. Bruxelles,' vol. xix, 1895. 



3. " Un parasite de la Glossiplionia sexocnlata." 'Mem. 



Acad. Lincei,' vol. xi, 1896. 



See Minchin (15). 



