Introduction to A nimal Morphology. 



395 



unites with its fellow in a common ejaculatory duct, 

 to which are appended 1-3 pair of long, tortuous, or 

 branched mucous glands for uniting the thread-like 

 spermatozoa into spermaphores, and one or two vesi- 

 culcB seminales. There is often a chitinous, grooved, 

 or tubular penis, which may lie in a special capsule 

 (some beetles), and may be an elongation of the end 

 of the duct. The sex orifices are usually in the 

 space between the eighth and ninth ring, rarely 

 far forward, as in the female Strepsipters. In Libel- 

 lula, the penis is on the second abdominal segment, 

 and has at its base a seminal vesicle, which, by a 

 bending of the abdomen before copulation, is filled 

 from the vas, which opens far back. 



The female has a tubular ovary on each side (or a 

 dense, often verticillate, bundle of ovarian pouches, as 

 in Hydrobius, &c.), fixed by an 

 ovarian ligament. The oviduct 

 begins as a calyx, and opens into 

 a common uterus, ending in a 

 vagina, at whose mouth open one 

 (Cicada) or two simple or branched 

 colleterial glands, by whose se- 

 cretion the eggs are united and 

 fixed in their places. A recepta- 



CUlum Seminis opens into the Reproductive organs of Lytta. 

 .1 1 . 1 . p^. a, accessoiy gflands ; A testes; 



vagina, or into the hinder part ot z/, vesicuia seminaiis ; p, penis. 

 the oviduct, and there is often a separate caecal pouch 

 from the vagina or bursa copulatrix for receiving the 

 penis. Owing to these receptive cavities, one impreg- 

 nation fertilizes successive broods of eggs. There 

 are also chitinous organs whereby the eggs are laid, 



Fi<: 



