90 THOMAS L. BANCROFT. 
than the other ; five micro-millimétres from the ends, one extremity 
which probably is the head, is 3 across, whilst the other is 5p ;_ 
there is no intestinal canal, the protoplasm is transparent at places. 
whilst at others there are numerous highly refractive particles, 
probably of a fatty nature. 
The parent worms are one and a-half to two inches (40 — 50 mm) 
long, white in colour, with one portion tapered gradually to an 
extremely fine lash, the termination of which is invisible to the 
naked eye, being only 7p to 10u across at the head. The body is 
tapered for half its length in the male, but for only a third in the 
female. The skin shows very fine striz, the whole structure of 
the body is more delicate than that of Z'richocephalus dispar, and 
more resembles that of the genus /ilaria. The genital pore is 
situated 6 or 7 mm. from the head, there is a membraneous funnel- 
shaped vulva. The male organ is prolonged from the caudal 
extremity and appears to consist of a membraneous sheath without 
any spicule. Width of middle of body of mature females 100p to. 
120p, across tail of females, which is blunt 65,, across tail of males. 
28. 
EXPLANATION OF PLATES. 
Plate VII. 
Fig. 1—Mature eggs (alive) x 160. 
Fig. 2—The same, cover glass pressed down to expel embryos. 
Fig. 3—A mature egg (alive) x 650. 
Fig. 7—Is a photograph of a section of the diseased liver hardened in 
Muiler’s fluid, stained by logwood and mounted in canada balsam; it was. 
taken by Zeiss’ apochromatic objective 2‘0 mm. 1°40 apert. and the No. 2: 
projection eye-piece on an Ilford isochromatic plate, x 270. 
Plate VIII. 
Fig. 4—A section of liver shewing masses of eggs x 50. 
Figs. 5 and 6—Eggs from liver (alive), some with divided yelk not. 
quite developed, magnified respectively 300 and 400 diameters. 
