162 FISHES. 



arranged in series along the ventral rays, and more nume- 



3fJ 



Fig. 73. — Solenostoma cyanopterum 9 (Indian Ocean). 



rous and longer at the base of the rays than in the middle 

 of their length, behind which they disappear 

 entirely. They are also more developed in 

 examples in which eggs are deposited in 

 the sac than in those which have the sac 

 empty. The filaments most developed 

 have a length of half an inch, and are beset 

 with mamilliform appendages. A slightly 

 undulated canal runs along the interior of 



the filament. 



The Testicles of the 



Teleosteans are al- 



Fig. 74.— Pouch -with, 

 ova, formed by the 



ventral fins of Sole- ways paired, and occupy the same position 



nostOTna. Lower ,i • mi • * * j_ 



, ^, , , as the ovaries. Their size vanes extra- 

 aspect ; the edges of 



the fins have been ordinarily at the different seasons of the 

 pushed asidetoaiiow _ ^^^ deferentia are constant. In 



of a view of the m- '' 



side of the pouch, the males of viviparous Teleosteans the 

 (Natural size.) urogenital papiUa is frequently enlarged, 



and clearly serves as an intromittent organ. In Clinus despicil- 

 latus the vas deferens widens within the abdomen iato a 

 cavity occupied by a complex network of loose fasciculi, 

 rising from the mucous membrane. The cavity can be com- 

 pressed by a special powerful muscle, the accumulated semen 

 being thus expelled with considerable force through the nar- 

 row aperture of the penis. In many Cyprinodonts the vas 

 deferens runs along the anterior anal rays, which may be 

 thickened, and prolonged into a long slender organ. 



