11 



tissue that was almost wliitish by transmitted liuht. In al)out 

 two hours the motions were reduced to very sHght siiuirming 

 movements. The outer contour of the filaria was clear cut, l)Ut 

 within its lateral borders the serrated edges of the transverse fibers 

 of the musculo-cutaneous layer could be traced. A little more 

 than halfway between the anterior end and the viscus-like organ 

 there was a refractile V-shaped papilla with its apex turned 

 toward the lateral border of the filaria. With the one-twelfth 

 oil immersion and compensation ocular No. 8, the head end was 

 observed and at its extreme tip a notched retractile lip could 

 be seen. Owing to the rapidity of the retractile movements the 

 number of notches was indistinguishal)le. In addition there was 

 a short, refractile, needle-like process, Avhich was seen to be pro- 

 jected and withdrawn. A few minutes later, when the movements 

 had become slower, the lip, when retracted, showed at least three 

 refractile tooth-like projections, and the needle-like spicule was 

 seen to be projected at about the l(>vel of the middle tooth. (See 

 Figs. B and C, PI. II. ) 



By watching carefully and noticing what was revealed during 

 the contractions and relaxations of the circular muscular fibers, 

 three narrow, refractile, and sinuous duct-like threads could l)e 

 traced Ijackwards until the}^ united with the anterior end of the 

 viscus-like organ. (See fig. 2, PI. I, and Fig. B, PL II.) The 

 exact manner in which they terminated anteriorly could not be 

 made out. No particular structure could be distinguished pos- 

 terior to the viscus-like organ, excepting a refractile, V-shaped 

 ])apilla, like the anterior one, and situated on the same side of 

 the body at a place slightly posterior to a point halfway between 

 the hind end of the viscus and the tip of the tail. The loose, 

 transparent sheath could be seen projecting l)eyond the posterior 

 l>ut not ])eyond the anterior end of tlie parasite. In six liours 

 ecdysis was not com})lete, tlie viscus-like organ had disappeared, 

 and refractile granules l)egan to make their appea4'ance in the 

 protoplasm. The parasite was measured just before granular 

 degeneration set in and was found to be: Lengtii, 0.31 millimeter; 

 greatest Ijreadth, 0.0075 millimeter; from anterior tip to anterior 

 end of viscus, 158 /a; length of viscus, 49.5 /x; from posterior end 

 of viscus to tip of tail, 114.75 fx. (Zeiss one-twelfth ocular 

 micrometer 8.) The average of four measurements is 0.327 by 

 0.0074 niillhueter. 



