ANIMALCULE ALLIED TO NOTOMMATA. 
347 
Figs. 6, 7j 8, 8" and 9, represent the ova in shelly cases, supposed to be ova that per- 
sist unhatched during the winter, or at least which are not developed within 
the body of the parent female. 
Fig. 6. The early stage of the ovum, through the coriaceous coat of which are seen 
numerous oil-globules in the yelk ; the ovum is, however, too opake to per- 
mit the germinal vesicle to be seen. 
Fig. 7. Further advancement of the ovum, in which a peculiar striated appearance of 
the flattened cells, which constitute the outer covering, may be observed. 
Fig. 8. A similar ovum, and fig. 8", a portion of these flattened cells, more highly 
magnified, to show to what is due the peculiar striated appearance. 
Fig. 9. An ovum ready to be expelled, in which the dark pigment has been added, 
which obscures all appearance of cells except at the margin. 
Fig. 10. Represents the impregnated female and the development of the ova, those 
destined to evolve living embryos. 
In this figure the ovisac contains four ova in different stages of maturity, 
viz. one (A) situated at the most inferior part of the animalcule, already 
nearly developed, in which the various internal organs are seen almost 
perfected ; cell nuclei are still visible in the two long muscles of the 
body, and as the embryo is seen frontwise, the organs are observed 
symmetrically placed. 
Immediately above this embryo is a second (B) obliquely situated, with 
the head downwards, and partially obscured by an ovum (C) lying over 
it, which has proceeded only as far as the conversion of the granular 
yelk into nucleated cells ; while above this is a fourth (D) still attached 
to the ovary, in which the germinal vesicle is very obvious and excen- 
trically placed. 
Fig. 1 1 . Represents the male animalcule in which the various organs are distinctly 
expressed. This specimen was found swimming free in water, taken from 
a pond in Warwickshire in August 1848. The spermatozoa are distinctly 
seen in the sperm-bag. 
Fig. 12. A male animalcule drawn from a specimen still in the ovisac of the female. 
A. The ciliated coronet. 
B. The pink eye. 
C. The circulatory organs with their ciliated tags. 
D. Contractile or pulmonary sac. 
E. The lateral opening, through which 
F. The penis, or male extrusory organ, is projected. 
G. The sperm-bag filled with spermatozoa. 
H. The glandiform bodies, or rudimentary structures, uses at present un- 
ascertained. 
Pig 13. Spermatozoa from the sperm-bag, obtained by compression. 
