

1906.] Life-history of Adelea ovata, Aime Schneider. 161 



From the foregoing remarks, I think it will be evident that the subject of 

 •ehromidia is one of great importance, but not one on which we are at present, 

 ■owing to our lack of knowledge, able to dogmatise. I will conclude by 

 quoting Mesnil. " II faut," says this writer, " bien se garder de trop 

 generaliser, et chaque cas ou le protoplasme se charge de granulations 

 chromatiques doit etre etudie avec soin a ce nouveau point de vue." 



Note on a New Gregarine from the Gut of Lithobius forficatus. 



Whilst examining centipedes for stages in the life-history of A. ovata, 

 I came across the trophozoites of a gregarine which, I think, has not been 

 recorded hitherto. The trophozoites were very numerous, but no spores or 

 other stages could be found. Hence it is at present impossible to refer the 

 -animal to its proper systematic position. 



Only one centipede which I examined contained these gregarines, but in 

 this particular case they were very numerous. The Lithobius infected was in 

 a dying condition just before I examined it, possibly owing to the harmful 

 effects of the parasite. 



The gregarine has an exceedingly simple structure (see fig. 3). There is 



/ , th ?J&\ 



Fig. 3. 



no epimerite, and the body is non-septate and usually slightly more pointed 

 at one end than at the other. A large nucleus containing a big karyosome is 

 situated more or less in the middle of the animal : its position varies. The 

 average length is 127 ft, breadth 48 p. The measurements were made from 

 permanent preparations. 



LITERATURE. 



(A.) Relating to Adelea. 



1. BUtschli, O. " Kleine Beitrage zur Kenntniss der Gregarinen : III, Uber eine 



eiformige Psorospermie aus dem Darm des Lithobius forficatus " (' Zeitschr. f. 

 wiss. Zool.,' vol. 35, 1881). 



2. Doflein, F. "Die Protozoen als Parasiten u. Krankheitserreger, etc.," Jena, 1901. 



3. Labbe, A. " Recherches zoologiques, cytologiques et biologiques sur les Coccidies " 



('Arch, de Zool. exp. et gen.,' vol. 4, 1896). 

 4 Art. " Sporozoa," in ' Das Tierreich,' Lief. 5, 1899. 



i 



