302 Macteay Menmoriat Vo.LuMe. 
Genus APHELENCHUS, Bastian. 
Transparent striated round worms, nearly always totally devoid of bristles or 
sete, varying in length from one-half a millimetre to one and a-half millimetres, 
attacking the tissues of plants by means of a spear and sucking apparatus of the 
following construction : a more or less distinctly three-bulbed spear, capable of being 
thrust forth and withdrawn by appropriate muscles, is connected with a powerful 
cesophageal sucking-bulb, by means of a tube whose lining is more chitinous than 
is usual in most Nematode genera. Behind the median bulb, the cesophagus 
continues for a short distance as a narrow tube, but soon gradually enlarges and joins 
the intestine in such a manner that it is often impossible to say where the cesophagus 
leaves off and the intestine begins. The oblique nerve-ring is situated just behind 
the sucking-bulb. 
1. A. microlaimus, Cobb. 3437-3 a “3 amm. The cuticula is traversed by 
seven hundred transverse strize. _To the slightly convex-conoid neck succeeds a some- 
what rounded head with six minute rudimentary lips, which are to be seen only in 
certain oblique aspects, and which are destitute of papille. The pharynx is armed with 
an unusually short spear, whose base presents 
“fi three rudimentary bulbs. The cesophagus is 
| one-fourth as wide as the neck and terminates 
posteriorly in an ellipsoidal bulb four-fifths as 

QPS 

% 
a, lips. 2 - 
b, spear. wide as the base of the neck ; thence the ali- 
c, nerve-ring (?). 5 = 2.3 
d, median (sucking) bulb. mentary canal continues, at first narrow, but 
e, ventral excretory pore. fa O : : 
f, ventral gland. gradually widening. The bulb is, morphologi- 
g, blind end of testicle. 7 ior 
h, intestine, eally, probably the median bulb—the posterior 
7, cuticle. ‘ : : 
i: spermatozoa. part of the cesophagus being rudimentary and 
Tichianonn aaseaeory pare: indistinguishable from the intestine. Nerve- 
i, youltral dapilla: fibres appear to exist both behind and in front 
o, terminus. 
of the bulb. The rectum seems to be about 
equal in length to the anal body-diameter. The 
ventral excretory pore is situated at a distance 
behind the cesophageal bulb equal to twice the 
: as ee pee ee my, length of the latter organ; the gland of which 
oe 3 the middle of the body. IV, posterior jt is the outlet is a very long and narrow cell 
as far behind the excretory pore as the latter 
is behind the mouth. The tail is conical to the terminus, which forms an outlet 
for the secretions of the caudal glands. The posterior branch of the sexual organs 
is only half as long as the anterior, and is therefore somewhat rudimentary. 
68 
: 5 —M®S 95-1 . : 
2-7 mm. ~The ventrally-arcuate conoid tail of the male presents a 
