l8o BULLETIN OF THE BUREAU OK FISHERIES. 



relatively as well developed as they were in the larva. The peripheral portions of the 

 ganglia are broken and jagged, and the large ventral trunk into which the infraganglion 

 was prolonged is so much reduced in size that it can not be followed into the free thorax 

 with any degree of certainty. 



The reproductive organs. — Claus and Hartmann both gave a very brief account of 

 the reproductive organs, but as they drew their information from an examination of 

 entire adults, so that their observation of the structure of these organs was made from 

 the outside through the body wall, their description was both scanty and inaccurate 

 in many particulars. 



Claus" said: " The sex organs correspond in position and form with those of the 

 Lemseopodidse. Drawn back out of the cephalothorax, they fill the widened posterior 

 portion of the body, and are made up of two symmetrically placed ovaries with attached 

 oviducts and the same number of tubular cement glands." 



Hartmann'' said: "The sex organs are made up of two simple sacklike ovaries 

 which occupy the last quarter of the posterior body. The wall of the same was very 

 contractile, but I could not make out the structure." In the Lemseopodidae, as shown 

 by the author," the ovaries are short, spherical masses of cells situated between the 

 stomach and the dorsal body wall, partly in the first (cephalothorax) and partly in the 

 second thorax segment, and the oviducts are given off from their posterior ends. 

 Here, on the contrary, the ovaries are elongated and spindle-shaped, flattened dor- 

 soventrally, and situated as Hartmarm said "in the last quarter of the posterior 

 body," namely, in the fifth thorax segment. They lie between the intestine and the 

 dorsal body wall; posteriorly they taper to a sharp point, which is suspended from the 

 dorsal wall by two short bands of striated muscle; anteriorly they are narrowed into 

 the oviducts which turn down ventrally around the outside of the intestine, and in 

 young females proceed straight back along the ventral surface to the vulvse. (See 



fig. ID, pi. VII.) 



In older females loops are formed in the oviducts coincident with the development 

 of the eggs, until in a fully ripe female each oviduct turns backward along the dorsal 

 surface of the intestine as far as the base of the abdomen, then forward nearly to 

 the anterior end of the fourth segment, then curves around to the side of the intestine 

 and runs backward to the vulva, just behind the pregenital prominence. (See fig. 



II, 12, 14, pi. VII, VIII.) 



On examining sections of the ovary under a higher power, the pointed posterior 

 end is seen to be filled with a mass of genital protoplasm containing numerous scattered 

 nuclei, but without definite cell structure. 



Proceeding forward the protoplasm gradually breaks up into rounded masses, each 

 containing many nuclei. (See fig. 15, pi. viii.) A little farther forward these masses 

 are divided transversely into separate cells, discoidal in shape and packed like rows of 

 coins, each with its own nucleus, which is now much enlarged and provided with a 

 nucleolus. 



At the anterior end of the ovary where these egg filaments pass into the oviducts 

 the individual cells are separated from one another, and each oocyte thus set free absorbs 

 food or yolk material, swells into a sphere, and becomes eventually a mature egg. 

 (See fig. 16, pi. viii.) 



a Schrift. Gesellsch. Beford. ges. Naturw. Marburg, vol. 9, supplement, p. 10, 1886. 



6Arch. Anat. Pnysiol., p. 749, 1870. 



c Proc. U. S. Nat. Mus, vol. 39, p. 219, 1910. 



