332 COMPARATIVE MORPHOLOGY OF VERTEBRATES. 
The testes, supported by mesorchia, lie at various levels in the celom. The 
relations of their ducts to the mesonephros are typical (p. 521). The vasa deferentia 
of the two side unite just before entrance into the cloaca to form a urogenital sinus, 
with which an oval sperm sac is connected on either side. In Chimera the genital 
portion of the mesonephros (fig. 331) is 
widely separated from the functional por- 
tion, the two being connected by the 
Wolffian duct. In the male the Miillerian 
duct is rudimentary and frequently is with- 
out a lumen. 
GANOIDS.—Nothing is known of the 
development of the sexual organs of the 
ganoids, except as to the origin of the germ 
cells in two species. In most species the 
ovary is band-like and the oviducts open by 
broad funnels into the ccelom, but in Lepi- 
dosteus the ovary is saccular, the eggs pass- 
ing into the central cavity, the duct being 
apparently a sterile, backward prolongation 
of the ovary. In the male the testes are 
frequently lobulated and a system of effer- 
ent ductules, connected by a longitudinal 
canal, pass from the testes into the meso- 
nephros (fig. 325) and thence separately 
or by a single tubule into the Wolffian 
duct. In the males of all but Lepidosteus 
there are short tubes with funnels, appar- 
ently the homologues of the oviducts of the 
females. 
TELEOSTS—In; some’ of the lower. Fw age Tesis she, enterion cfd 
et of mesonephbros 0. 1mera, aiter Par- 
teleosts (salmonids, etc.) the elongate ovary jer and Burland. bv, blood-vessel; 
is solid and the eggs pass from it into the cv/, longitudinal tubule; m, Miillerian 
ccelom and are carried thence to the exterior ‘ucts ms, anterior end of mesonephros 
fe (Leydig’s gland); spd, sperm duct; ve, 
by short peritoneal funnels (fig. 332), or the yet, vasa efferentia; vs, seminal vesicle. 
tubes and funnels may be absent and 
the eggs then pass out by abdominal pores. In most teleosts, however, each ovary 
is a closed sac (like that of Lepidosteus, fig. 326) continued behind by a slender 
oviduct. The ducts of the two sides may open separately, but usually their hinder 
ends are united and open by a single genital pore between the anus and the rectum 
In some instances (fig. 325, E), the urinary and genital pores are on a urogenital 
papilla. In the male the elongate testes are either simple or lobulated. Internally 
each consists of radial chambers of varying shape which are connected with a 
complicated system of tubules which lead to a vas deferens running back to open 
into the hinder end of the Wolffian duct, or separately to the exterior (fig. 333, go). 
In most teleosts the number of eggs produced in a season is very large, sometimes 
numbering millions. Usually, after passing from the oviducts, they are left to the 
