^69 



cecum has thick walls with voluminous ca- 

 vitj' but soon the walls take on a very cu- 

 rious appearance. There appear in the in- 

 terior voluminous prominences or viliosities, 

 which may be seen externally as dark blot- 

 ches. These prominences, which almost 

 reach the middle of the cavity, are few in 

 number and give the cavity a very irregular 

 outline when observed in transverse sections. 

 The portion thus differentiated is clearly 

 observable in th? male specimens (Fig. 1), 

 but in the females it is usually obscured by 

 the coils of the oviduct and ovary. This 

 first portion of the intestine measures about 

 1,21 to 1,56 mm. in length. 



The midportion of the intestine has the 

 usual structure of the intestine of small ne- 

 matodes, is more or less circular in section 

 (Fig. 11), and constitutes the greater part 

 of the digestive tube. 



The terminal portion is easily observa- 

 ble in the females while in the males it is 

 more or less involved with the deferent ca- 

 nal and ejaculatory duct, ventrally, and 

 with the sheath of the spicules, dorsally. 

 The cavity is filled with viliosities that are 

 less notable than those seen in the first 

 portion, but m greater number and directed 

 from before backward. This villous portion 

 is about 1,2 mm. in length and narrower 

 than the anterior villous portion and termi- 

 nates in the rectum. 



The rectum, which is the last portion 

 of the intestine, is narrow with strongly 

 chitinized walls, and terminates in the fe- 

 males (Fig. 6) in a transverse anus, and in 

 the males in a common cloaca with the 

 ejaculatory canal and the sheaths of the 

 spicules. On account of the proximity and 

 consequent complication of the male genital 

 organs, it is not easily observable in the 

 individuals of this sex. In the females, on 

 the contrary, it can be observed entirely, 

 since the uterine and ovarian coils are always 

 much above. The rectum, in the female, is 

 provided with four large monocellular glands. 



Female genital apparatus. - The vulva is 

 situated just above the middle of the body, 

 it is formed by a transverse slit with sligh- 



tly projecting lips. In the fecundated fema- 

 les it is generally found protected by a 

 shield of brown color, formed by the copu- 

 lation cement. 



The ovijector is of a very simple type, 

 claviform, with the extremity in opposition 

 to the rounded vulva, from which start two 

 thin and muscular vestibules. The ovijector 

 (Fig. 12) is directed forward and measures 

 about 1,2 mm. in length (without the vesti- 

 bules) by 0,087 to 0,190 mm. in diameter, 

 (minimum and maximum). The vestibules 

 measure 0,240 by 0,070 mm. and are cylin- 

 drical. The uteri are divergent,''almost straight 

 and contain a large number of eggs in va- 

 rious stages of development. In continuation 

 with the uteri are the oviducts, which are 

 at first of normal appearance and of regular 

 diameter, o.nd later show an irregular out- 

 line of moniliform appearance and 

 much reduced diameter, which the eggs 

 pass with difficulty The oviducts are coiled 

 near the termination of the ovaries, the an- 

 terior being at a short distance from the 

 esophagus, at the height of the anterior diffe- 

 rentiated portion of the intestine and the 

 posterior in front of the terminal differen- 

 tiated portion of the intestine. The initial 

 part of the uterus and the not moniliform 

 portion of the oviduct act as a seminal re- 

 ceptaculum, the fecundation occurring in the 

 oviduct. 



The ovary following close on the oviduct, 

 very long and cylindrical. It forms some coils 

 in the part near the oviduct and then has 

 its course in opposition to the uterus of the 

 same side, making many convolutions and 

 crossing with the opposite ovary at about 

 the height of the vulva, such belonging to 

 the amphidelphous type of SEURAT. 



Ova. -Relatively large, of ellipsoid form, 

 with a thick and rugose shell including an 

 embryo at the time of being deposited; they 

 measure about 0,120 mm. in length by 0,056 

 to 0,063 mm. in greatest diameter. 



Male genital apparatus. ~\{ is formed 

 of a cylindrical testicle, short and curved 

 in U shape, its terminal branch being the 



