FISH ENTOZOA FROM YELL(3WST()NE I'AHK. 551 



of minute, short filaments felted together (Fig. L'l, .s). These, when 

 isolated, appear as slender lilameuts with a black speck at one end. 

 They are presumably spermatozoa. I Avas not able to demonstrate 

 any counuunication between the testes and the vas deferens from my 

 sections. The wall of the cirrus-bulb is thick and well supplied with 

 circular muscular libers, and within there are numerous retractile 

 muscular fibers. The cirrus was retracted in all the specimens. The 

 aperture of the cirrus, as seen in section through the retracted organ, is 

 quite irregular, with puckered walls and its longer axis transverse to the 

 long axis of the body (Fig. 19, c i). 



The germ gland or ovary lies transversely across the body about 

 midway between the genital aperture and the posterior end (Figs. 

 13, 14, 15, g). It is a single organ, though comprising two marginal 

 lobes with a narrower connecting part. The latter disappears in 

 specimens which have become replete with ripe ova, while the marginal 

 lobes still remain (Fig. 14, {/). In such cases there appear to be two 

 ovaries. In Fig. 1.3 there appear to be two ovaries. The sketch was 

 made from a section which passes on the dorsal side of the part which 

 connects the marginal lobes. It is thus seen tliat the marginal portions 

 of the ovary extend fai'ther toward the dorsal side than the part which 

 connects them, Tlie ovaries are made up of nucleated cells closely 

 and uniformly packed together. They do not lie in clusters or nests like 

 the granular nuclei of the testes and the vitelline glands. In the older 

 specimens, however, the ovary appears to be broken up into lobular 

 portions (Fig. 14, g). ' The ovary as a whole lies nearest the ventral face 

 of the body. 



The vitellaria (Figs. 13, 14, 15, vg) in the younger si)ecimens are seen 

 to consist of two marginal glands which connect with a posterior gland 

 lying behind the ovary. In the adult si)ecimens this organ may be 

 divided into at least three distinct glands, one posterior and two mar- 

 ginal. The vitellarian gland differs from the ovary in being lobulated, 

 and in the lobules there are numerous clusters of granules, appearing 

 in section as circles or oval nests of nuclei. This organ is well de- 

 veloped along each margin in the vicinity of the cirrus bnlb, extending 

 forward of the cirrus bulb i'or a short distance and overlapping the 

 testes. I observed small ducts leading from the marginal glands, but 

 found nothing corresponding to the conspicuous marginal ducts noticed 

 by Van Beneden in his account of the anatomy of the related genus 

 CaryophylUeus. 



The ducts from the vitellaria were in some cases crowded with small 

 globular masses, which apparently originate from the disintegration of 

 the nests of nuclei in the vitellaria. The exact relation of these ducts 

 to the duct from the germ gland was not certainly made out, but they 

 were so far traced as to show that they unite with that duct near the 

 median line on the dorsal side of tlie germ gland not far from its pos- 

 terior border. 



