60 Blood Parasites 
Fig. 21. Spirocliaetes from the Pipistrelle (named provisionally Spirochaeta vesperuginis 
sp. n.). Compare 47. 
Fig. 22. Spirochaetes from the Noctule, both 21 and 22 same magnification. Some 
of them show slight flattening and are thinner in the centre. Compare 48. 
Fig. 23. Peculiar bodies, often found in the blood of the Mole. 
PLATE ill. 
Figs. 24 to 26 and 28. Halteridia of Thrush: fig. 24, two microgametes ; fig. 25 = two 
macrogametes; fig. 26= young, and a mature macrogamete; fig. 28 = ookinete, with 
a microgametocyte (free flagellum) near. 
Fig. 29. Halteridia of Starling, flagellating body—microgametocyte. 
Figs. 27 and 30 to 44. Stages in leucocytozoon of Thrush. 
Fig. 27. Two young leucocytozoa. 
Fig. 30. Ookinete stage. 
Fig. 31. Flagellating leucocytozoon of Thrush. 
Fig. 32. Male and female (macro- and microgamete) leucocytozoa—note the rounded or 
spherical shape of the leucocytozoa of Thrush. 
Figs. 33 to 44. Stages in the possible schizogony of the leucocytozoon of Thrush. 
Figs. 37, 39, 40, 41 and 42. Show these multi-nucleated bodies inside the protoplasm of 
a leucocyte. 
Figs. 33, 34, 35, 36, 38, 43 and 44. Free forms of the multiplication phase. The size 
and shape vary somewhat, as do the contained red chromatin masses. In many 
vacuoles are seen. Fig. 44 shows some of the nuclear masses escaping. Fig. 43 shows a 
dense collection of the red masses, whilst fig. 35 represents so dense an agglomeration 
of nuclear masses, which under the microscope appeared as densely stained red bodies, 
that it has come out in the photo as a homogeneous dark mass. One can see how¬ 
ever the remains of the nucleus of the host cell. 
Fig. 39. Possibly the youngest stage of schizogony. 
PLATE IV. 
Fig. 45. Segmenting cross-forms of piroplasm-like bodies, from the Water Vole (named 
provisionally Nuttallia microti sp. n.) xl500. 
Fig. 46. Dividing forms of the non-pigmented intracorpuscular parasite of the Pipistrelle, 
Achronuiticun, to show its resemblance to the piroplasms. x 1500. 
Fig. 47. Spirochaetes from Pipistrelle (named provisionally Sp. vesperuginis n. sp.). 
X 1500. 
Fig. 48. Spirochaetes from the Noctule, xl500: long forms some of which show indica¬ 
tions of transverse division. 
Fig. 49. Leucocytes from blood of Field Vole with cell inclusions. 
Fig. 50. Graham-Smith’s bodies, Grahaviella, from very young Rat, showing intra- 
corpuseular and free forms, x 1500. 
PLATE V. 
Figs. 1 to 12. Haemogregarina sciuri n. sp. 
Figs. 1 to 8. Free Haemogregarines. 
Figs. 1 and 2. Kidney or sausage-shaped forms fig. 1; showing especially polar granules. 
Fig. 3. Somewhat longer form ; figs. 4, 5, 6. Long, narrow and slightly curved forms. 
Figs. 7 and 8. Haemogregarines with recurved pointed end deeply stained in a capsule. 
