Kotes on a New Boveria species. 3 



process, the lip (/), 10 — 15 ^ long. The mouth (???) is a shallow 

 but tolerably wide oval depression placed nearly at the centre of 

 the peristomal disc. The margin of the disc is bordered by a 

 narrow and very shallow groove {s.g.), which starts from the very 

 tip of the lip, and after taking a spiral course of about P/e turns, 

 ends in the mouth- depression. The two ridges bordering this spiral 

 groove carry each a single series of strong cilia, which are about 

 ^/s as long as the body-length. The remainder of the body- surface 

 is covered by finer and much shorter cilia arranged in 20 — 20 

 longitudinal rows, 



The contractile vacuole {c.v.) may be seen in the living 

 specimens as a small clear vesicle, lying generally beneath the 

 peristomal ciliated groove. The mouth is not followed by a 

 cytopharynx. Nor is the finely granular lenticular disc present, 

 which is said to exist in the aboral region of Boveria suhcylindrica. 

 There are several food-MicQoles of varying sizes, mostly situated 

 in the anterior half of the body. Of the two nuclei, which are 

 ha clly visible in the fresh state, the elliptical meganucleus (fig. 1, 

 N) is situated usually in the middle of the body, while the vesi- 

 cilar micronucleus {n) hes near the aboral end, The meganucleus 

 in the resting state appears, when examined in the fixed and 

 stained state, as a thick mass of minute, homogeneously deeply 

 stained granules on a very delicate network of hnin, the whole 

 structure being bounded against the entoplasm by a faintly stain- 

 able nuclear membrane. Bat, in individuals which are in the 

 process of fission or of conjugation, the meganucleus reveals a 

 structure very diffèrent from that mentioned above ; that is, while 

 the majority of the nuclear granules, which seem to represent 

 plasmosomes, are contracted into a slightly stainable central mass, 

 thus giving rise to a narrow clear area between this mass and 

 the nuclear membrane, a few, which are deeply stained with 



