25 
IX, ti, 7 ; and X, 15, 1(5, 18) ; the walls of the segments are absorbed 
each side the central long fissure (Plate IX, 8, 10, 15, 1G, 17, 18), which 
extends to the margin of the cyst in one direction, and upon separation 
at that end motion begins, and the Anguillula awakes to life and ac- 
tion. (Plates IX, 17, 18; and XI, 1.) 
The growth within the cyst continues till the worm attains a length 
of y^f" o inch or more, and a central diameter of T ofhny inch ; the cyst 
ruptures, the worm is free (Plate XI, 2, 3, 7), leaving the empty shell 
shrunken and torn. (Plate XI, 4, 4a.) 
Up to this point I have failed to discriminate the sexes. Both appear 
blunt at one end, which is marked with a fissure ^oo inch to T ^o 
inch in length, often with a circular hinge-like termination (Plate XII, 
3a, 4a, 6a, la. and XIII, la, 2a, 3a) extending into a tortuous channel 
Tolroo inch in diameter and averaging y^-^ inch in length; then the 
remainder of the worm becomes a mass of cells of various sizes to within 
TTUU70 inch or nftfo o inch of the extremity or tail. 
These cells at times appear with a sinuous channel clear from either 
end (Plate XII, 4), or with breaks in their continuity (Plate XII, 2, 3), or 
granular masses interspersed (Plates XII, G, 7, and XIV, 1, 2), or as 
fine cells irregularly arranged. (Plate XIII, 1, 2, 3.) Occasionally the 
whole interior appears as a solid mass of cells. (Plate XII, G.) 
I have not discovered the method of impregnation, but at an early 
period rapid changes in shape begin in the female. (Plates XVI, 2 to 
15 ; XVII, 1 to 9 ; XIV ; XV ; and XII, 5, G, 7, 8.) The enlargement is 
preceded by the formation in both upper and lower thirds of the body 
of dark masses of cells that eventually unite (Plates XIV, 3, A, B ; 4, 
5, A, B, 0, and 6 ; XV, 2, 3), then by the time the worm reaches the 
age represented in Plate XVI, 11, 12 ; Plate XVI, 3,4, become changed 
into abicornate ovarium or uterus, which at full term attains the length 
°f i-(hm)% inch in many coils, and contains one hundred and fifty or one 
hundred and sixty full-sized cysts. 
The shapes and sizes of these pregnant females vary greatly, and I 
believe are the result of the environment. In soft tissues of the Cow- 
pea, Radish, and the like rapidly-growing plants they attain a transverse 
diameter of tto o o inch, and a length of too£o inch. The tail is reduced 
to a short spine (Plates XIV, 3 ; and XV, 2, 3), which disappears later 
on, as the worm approaches the transverse diameter of - t m^ inch. 
(Plate XVII, 3, 4.) 
The thickness of the exterior wall varies from yof oo inch at the 
lower part of the body to yowo inch at the vertex, and is exceedingly 
tough and resistant. In color it appears yellowish by transmitted light, 
but a brilliant white by reflected light. When fully developed, it is 
partly transparent, showing the coils of the uterus with its cysts. The 
exterior is granular or corrugated, especially near the " head" (Plates 
XIV, G, and XIX), and with an apparently radiate arrangement of cells 
from a center near the tail, or perhaps marking the disappearance of 
that appendage. (Plate XX I. ) 
