162 FISHES. 



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



Fig. 73. — Solenostoma cj^auopterum 9 (ludian 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- 

 ways paired, and occupy the same position 

 as the ovaries. Their size varies extra- 



Fig. 74.— Pouch with 

 ova, formed by the 

 ventral fins of Sole- 

 nostoma. Lower 

 aspect ; the edges of 



the fins have been Ordinarily at the different seasons of the 

 pushed aside to allow ._ y^^^ defcreutia are constant. In 



ot a view of the in- 

 side of the pouch, the males of viviparous Teleosteans the 

 (Natural size.) urogenital papilla is frequently enlarged, 



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

 latus the vas deferens widens within the abdomen into 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. 



