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455 
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EXPLANATION OF PLATES XXXVII AND XXXVIII. 
Illustrating Mr. Wilson’s paper on Spermatogenesis in the Bryophyta. 
All the figures were drawn with the camera lucida under a 2 mm. apochr. horn. imm. Zeiss, 
N.A. 1*40 with comp. oc. 18, x 2250, except Figs. 65, 70, and 71, which were drawn under a 3 mm. 
apochr. horn. imm. Zeiss, N.A. 1.40 with comp. oc. 18, x 1500. 
Figs. 1-44 refer to Mnium hornum\ 1-15 to divisions in the antheridium, and 16-44 to 
spermatids. Figs. 45-60 to Atrichum undulatum ; 45-9 to divisions in the antheridium, and 
50-60 to spermatids. Figs. 61-81 to Pellia epipliylla. 
PLATE XXXVII. 
Mnium hormim. 
Fig. 1. Resting cell from antheridium just before antepenultimate division. 
Fig. 2. Metaphase of antepenultimate division in side view. 
Fig. 3. Metaphase of antepenultimate division in polar view. 
Fig. 4. Constriction of body from nucleolus before penultimate division. 
H h 1 
