bh 
POINTS OF THE ANATOMY OF POLYXENUS LAGURUS. 105 
DESCRIPTION OF PLATE VII, 
Illustrating Mr. F. G. Heathcote’s paper ‘“ On Some Points 
of the Anatomy of Polyxenus lagurus.” 
Fie 1.—Part of a transverse section through the middle of the body, 
showing the ventral plate. The bases of the legs are separated and the 
ventral plate—that is, the fused anterior part of the two ‘lames pedigéres ” 
of Brandt—occupies the space between them. 
Fic. 2.—Part of a transverse section through the body, showing the female 
external generative appendage. dil. ovid. Dilation of the oviduct. 
ext. gen. org. External generative organ. 
Fie. 3.—Section through the male generative appendage. dil. vas. def. 
Dilation of the vas deferens. 
Fic. 4.—Section through the sense organ. eat. cut. Hxternal cuticle. 
hyp. Hypodermis. ¢. Tube. gaz. Ganglion-cell. hyp. c. mass. Hypodermic 
cell mass. 
Fic. 5.—A transverse section through the fourth segment of a female, to 
show the ovary, receptacula seminis, and the general arrangement of the 
organs. The figure is semi-diagrammatic; the outline of the body, the gut, 
ovary, receptacula, and nerve-cord being from an actual section; while the 
heart, muscles, and fat-body are diagrammatic. g. x. c. The ganglionic part 
of the nerve-cord. /. z.c. The fibrous part. ec. sem. Receptaculum seminis. 
spmzoa. Spermatozoa in the receptacula. ovidet. Oviduct. 
Fic. 6.—Part of a transverse section through the posterior part of the body 
of a female, to show the Malpighian tubes and the ovary. 4g. z. c. Ganglionic 
part of nerve-cord. /. ”.c. Fibrous part. fol. ov. Follicle round ovum. ov. 
Ovum. w.ov. Wall of ovary. 7. Malp. t. Returning part of the Malpighian 
tubes. Malp. t. Malpighian tubes. 
Fic. 7.—Part of a section through the testis of a male, showing a follicle 
containing a sperm morula. /. Follicle. sp. mor. Sperm morula. 
Fic. 8.—Part of a longitudinal section through the posterior end, to show 
the Malpighian tubes. a. d. Anal dilatation. 0. #. Outer wall of the gut. 
malp.t. Malpighian tube. 7. ma/p. ¢. Lumen of Malpighian tube. memd. 
Membrane. 
Fie. 9.—Section through gut and Malpighian tubes. ma/p. ¢. Malpighian 
tube. 7. malp.t. Reduplicated part of Malpighian tube. memb. Membrane. 
