NO. 228G. THE NEW COPEPOD FAMILY SPUYRI I DAE— WILSON. 563 



to the stomach and intestine, and are so large in Rehelulu that they 

 cause the posterior portion of the head to bulge out dorsally into two 

 hemispherical knobs. The vasa deferentia are given oif from the pos- 

 terior ends of the testes and run back nearly in a straight line along 

 either side of the body to the dorsal portion of the genital segment, 

 where they turn down ventrally and are enlarged into spermatophore 

 receptacles. For a considerable portion of its passage along the side 

 of the body each vas deferens is surrounded by a mass of glandular 

 tissue which secretes and pours into the lumen of the sperm duct the 

 cement substance, which hardens into the covering of the spermato- 

 phore. The opening through which the spermatophore is extruded 

 is on the ventral surface, just in front of the posterior processes. 



Female reproductive organs. — The ovaries are paired, and are situ- 

 ated either along the lateral margin of the anterior portion of the 

 trunk {SpJiyrlon) ., or just inside and in front of the cement glands 

 {Paeon., Rehelula). They are nearer the dorsal than the ventral sur- 

 face, and are slightly flattened against the lateral wall. Each ovary 

 consists of a mass of tiny cells, with no arrangement into filaments, 

 but with all the eggs separate and in close contact one with another. 

 But there is not the uniform gradation in size from one end of the 

 ovarj' to the other that was found in the Lernaeidae. The eggs in- 

 crease rapidly in size as soon as they leave the ovaiy thix)ugh the 

 absorption of food material and yolk. They are arranged in the ovi- 

 duct in a single row, and retain perfectly their spherical shape. Occa- 

 sionally they become flattened a little through crowding, especially 

 around the turns of the oviduct, but they are never compressed into 

 disks. 



The oviducts are narrow and thread-like and are coiled back and 

 forth laterally between the dorsoventral muscle strands without any 

 definite arrangement. Apparently they first fill the space at the pos- 

 terior portion of the genital segment between the cement glands and 

 the intestine, and then extend forward into the central portion of 

 the trunk which represents the fifth thoracic segment, and may even 

 reach in Paeon and Sphyrion the extreme anterior end of the trunk, 

 the fourth thorax segment. 



In Rehelula they are prevented from doing this by the branched 

 intestinal processes and occupy only the triangular space on either 

 side behind those processes. The sperm receptacle is situated at 

 the posterior end of the genital segment, on the median line between 

 the two vulvae, and ventral to the intestine. The cement glands aro 

 in the postero-lateral portions of the genital segment and follow the 

 contour of the body wall. The glandular portion is long and nar- 

 row except in Paeon versicolor., where it is short and thick. It lies 

 a little nearer the ventral surface and is usually curved inward a 



