JOURNAL OF MICROSCOPICAL SCIENCE. 
EXPLANATION OF PLATES VI & VII, 
Illustrating Mr. J. E. Bloomfield’s paper On the De- 
velopment of the Spermatozoa.^’ Part I. Lumbricus.” 
Fig. 
1. — Testis of the earth*worm — a small example as seei under low power. 
2. — Cells from the trabecular sustentaculum of the seninal reservoir. 
3. — Portion of wall of a seminal reservoir with fusifom cells of the sus- 
tentaculum. 
4. — Transverse section of the seminal reservoir, showag the penetrating 
blood-vessels. 
5. — A portion of a seminal reservoir more highly magiified, showing the 
spermatospheres packed in the vascular sustentaculum. 
6 — 10. — Cells (spermatospores) from a young testis eased : osmic acid 
and picrocarmine. 
10a. — Drawn on a larger scale. 
11 — 15. — Cells from young seminal reservoir elongting to form the 
sustentacular fibres. 
16 — 20. — Spermatospores, dividing into two (young ‘polyplasts ”). 
21, 22. — Into four. 
23. — Three segments. 
24. — Eight segments or spermatoblasts, drawn in fres state. 
25. 26. — Ditto, with acetic acid. 26 showing cental protoplasm or 
blastophor {bl). 
26a. — Sixteen spermatoblasts. 
27, 28. — A polyplast. 27, with acetic acid. 28, fresl 
29. — Similar polyplast on treatment with osmic acid ail picrocarmine. 
30, 31, 32. — Further stage in segmentation, fresh. 
33, 34, 35. — Ditto, treated with osmic acid and picrocrmine. 
36, 38. — To show the central blastophor {bl) at this sige, and in the 
following. 
37. — Showing refractive cap on the spermatoblasts. 
39. — Showing protrusion of fine filament. 
40. — Same stage fresh. 
41 — 46. — Progressive stages, consisting in an elongatioof the nuclei of 
the spermatoblasts, h, n, t, head, neck, tail. 
