530 . The American Naturalist. [June, 
The larger corpuscle is the one nearest the observer. Thestructural 
peculiarity of one side of the nucleus should be noted—where cyto- 
plasm and yolk granules are in intimate relation with contents of nu- 
cleus. This is Garnault’s “ prophase ;” it is the stage just previous to 
formation of nuclear plate leading to the forming of first polar globule. 
In another egg, No. 9, from the same oviduct, an optical section showed 
rays of hyalocytoplasm pushing out fromfclear area through granules 
of vitellus. Chromosomes irregularly placed in hyaline area. Spindle 
striae observed in viewing the egg at right angles to spindle axis. 
Fig. 3 illustrates an optical 
section of egg No. 11 from 
oviduct of another animal, oc- 
cupying the same relative po- 
sition as No. 11 in the ovi- 
duct drawn. In an eccentric 
position, and near the surface, 
a clear circular area with ra- 
dial striae was observed, indi- 
cating the presence of the male 
pronucleus, A portion of the 
membrane of the germinal ves- 
icle still present. Egg No. 
Fic. 3. 10, in the same animal, also 
showed circular male area m 
direction of axis of spindle, and chromatin granules within it. In egg 
No. 9 the head of spermatozoön was seen in optical section, some little 
distance from periphery, circular with narrow Hof about it and striae 
radiating from Hof. Very fine granules were evident within this pro- 
nucleus. 
Fig. 4 illustrates part of a sec- 
tion of egg shown in Fig. 2, cut 
in such a plane as to show the 
sperm nucleus near the periph- 
ery. Drawn with Zeiss Oc 1 and 
rx oil immersion. Garnaultsays, 
in speaking of formation of 
sperm nuclesin Arion and Helix, 
“the spermatozodn enters just 
before first kinesis or immedi- 
ately after. The contracted head Fic. 4. 
~ does not begin to change until 
after the expulsion of the second polar globule. The sperm-head first 
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