CYTOPLASMIC INCLUSIONS OF THE GERM-CELLS. 463 
• Figs. 40, 41, and 42, show macromitosomatic spireme, and acrosome 
)<rmation. 
Fig. 43. — Abnormal triaster mitosis showing disposition of mito- 
chondria and acroblasts. 
Fig. 44. — Outgrowth of flagellar organ in Pieris brassicse. At X. 
is a body whose significance has not been worked out. It may be 
formed by the conglomerated acroblasts, or the remains of the spindle 
bridge. 
Fig. 45. — Three young oocytes of Euchelia showing the cytoplasmic 
bodies. 
Fig 46. — Spermatogonial nests of Euchelia showing spindle bridge 
and mitochondria 
Fig. 47. — Head of sperm just after acrosome is formed. A.G. Acro- 
somic granule. 
Fig. 48. — Prophase of first maturation division in S. populi showing 
undoubted effect of spindle fibres on the mitochondria and acroblasts. 
Fig. 49. — From a Regaud smear showing the staining effect with iron 
hsematoxylin in the first maturation division (compare with fig. 32). 
Fig. 50. — Detailed drawing of clavate flagellar organ of Pieris. 
Fig. 51. — An earlier stage than fig. 47 to show several acroblasts 
secreting the granule. In fig. 47 these have fused. 
Figs. 52 and 53. — Two abnormal spermatid stages, showing peculi- 
arities in the micromitosome. 
Figs. 54 and 55. — Regaud smear preparations of the metamorphosing 
spermatid. Nucleus dotted in, though it did not stain. 
EXPLANATION OF TEXT-FIGURE 3. 
(See p. 440.) 
Figs. 1 to 9 illustrate (jiagrammaticaUy the behaviour of all the 
plasmatic elements found in Lepidopterous spermatogenesis. The 
acroblasts (AB) can be followed through cell division to the spermatid 
(Fig. 3) ; later they become vesicular (Figs. 4 and 5), and finally fuse to 
form the bladder-like body which forms the acrosomic granule. The 
mitochondria in Figs. 3 and 4 fuse to form the macromitosomal spireme 
( MD ). The division of the centrosome (Fig. 4) and the partial revolu- 
tion of the sperm head are also illustrated. The apparent fragmentation 
of the mitochondrial spireme in Figs. 8 and 9 may be an artefact. 
