300 Macteay Memoria Vouume. 
is not more than half as long as the anal body-diameter. The unicellular ventral 
gland lies just behind the cesophagus, and empties, by means of a slender tube 
devoid of an ampulla, through the ventral excretory pore, situated half-way between 
the nerve-ring and the posterior end of the cesophagus. The distance between the 
two lateral wings is equal to one-fourth the length of the diameter of the body. 
The median fields are very narrow; no submedian fields came under notice. The 
tail is conoid from the conspicuously-projecting vulva. The anus is inconspicuous. 
There are no anal glands. The vulva, a transverse slit one-half as long as the body 
is wide, is opened during copulation and oviposition by means of four pairs of oblique 
muscles arranged in two antagonistic groups, one anterior to the vulva and the other 
posterior. Each of the posterior pairs is attached distally near the ends of the slit 
and proximally to the body wall near the ventral submedian lines some distance back 
from the vulva. The antagonistic muscles are arranged similarly, but in front of the 
vulva. The short vagina leads forward into the uterus, which is as long as the 
distance from the vulva to the anus, and in adult worms commonly contains one or 
two eggs (three-fourths as wide as the body and twice as long as wide), which are in 
the later stages of segmentation. The anterior part of the uterus is occupied by 
numerous spermatozoa, which are placed there by copulation with a male, and which 
fertilise the egg immediately on its entry into the uterus. A rudimentary sac-like 
posterior branch of the sexual organ extends backward from the vulva half-way to 
the anus. The females are viviparous or ovoviviparous. oe SE tm «In 
the male the anus projects so as to be prominent. The transparent ribless bursa 
originates anteriorly opposite the proximal ends of the spicula, and ends behind the 
middle of the tail or near its end. The two equal elongated arcuate-cuneiform 
spicula are one and one-half times longer than the anal body-diameter, their proxime 
being slightly cephaloid by expansion. The thin and inconspicuous accessory pieces, 
in which the spicula slide, are half as long as the spicula. In the neighbourhood of 
each spiculum and behind the anus I observed cells which may be glandular in 
function. The single testicle extends forward to near the cesophagus. The ripe 
spermatozoa are one-sixth as wide as the body. 
Syn.—T. dipsaci, Kiihn; 7. alli’, Beyerinck; 7. hyacinthi, Prilleux; 7. 
Haversteinit, Kiihn. 
Hab.—Parasitic in onions, hyacinths, teasel, rye, oats, buck-wheat, clover, 
potatoes, &e. 

3. T. granulosus, n.sp. j3-37-3s- 33-24 ‘mm. The cuticle is traversed by about 
four hundred and seventy-five transverse striz, which exist in the outer as well as 
the inner layers. The conoid neck terminates anteriorly in a head somewhat rounded 
in front and bearing six somewhat spherical lips. The stout spear is one-tenth as 
