Coss—Vematodes, mostly Australan and Fijian. 273 
the base, and one well-developed and projecting dorsal tooth extending three-fourths 
the distance to the lips; according to Biitschli, excretory ducts on both sides of the 
body; uteri containing but few eggs; oviparous; male tail convex-conoid for a distance 
equal to twice the anal body-diameter, being at that point as wide as the spicula and 
continuing conoid to the exceedingly fine terminus ; two pairs of pre-anal papillee, 
one opposite the proximze and the second opposite the middle of the spicula, both 
submedian ; post-anal papillae, two pairs submedian opposite the anus, two pairs 
submedian near the middle of the large part of the tail, and the remaining four pairs 
approximated near the commencement of the narrow part of the tail ; spicula linear, 
one and one-half times as long as the anal body-diameter, distal halves only arcuate 
to the acute points ; accessory pieces less than half as long as the spicula. 
ffab.—F ound among decaying masses on the surface of the river Main at 
Frankfort, Germany. 
12. D. macrodon, Oerley. 3343—“54 10mm. Cuticle with about one thousand 
transverse strize; neck nearly cylindrical, convex-conoid near the head; head rounded 
in front ; no cephalic setz ; lips prominent ; lateral organs said to be circular with a 
spot in the middle, nearly as wide as the pharynx, behind the base of which they are 
situated; pharynx irregularly cylindrical, one-third as wide as the head; dorsal tooth 
reaching half-way to the lips, the other two only one-third as long but equally pointed; 
median bulb central, prolate, two-thirds as wide as the neck, somewhat wider than the 
conoid posterior swelling ; the intestine is half as wide as the body and is marked off 
from the cesophagus by a deep and narrow constriction ; excretory pore at 107%, that 
is, somewhat in front of the cardiac constriction ; tail conical from the inconspicuous 
anus; terminus wider than usual, z.¢., not hair-fine; vulva depressed; eggs ellipsoidal, 
as long as the body is wide and half as wide as long; viviparous; reflexed portions of 
the ovaries reaching one-fourth the way back to the vulva. Ea al et tmm. Male 
tail conical, its terminus hair-fine ; papillze as follows : one pre-anal pair, submedian, 
opposite the proximz; one post-anal ventral near the anus; the remainder post-anal, 
of which the first is as far behind the anus as the pre-anal submedian pair is in front 
of it, the second considerably behind the middle of the tail, and the third half-way 
between the second pair and the terminus ; spicula elongated, two-thirds as long as 
the anal body-diameter, their proxime enlarged and apparently furcate. 
ffab.—¥F ound in Hungary. 
: . : Ue Re big ope ie * D E 
13. D. rivalis, Leydig. jgqsae—z-7 25mm The skin is marked by about 
thirteen hundred transverse striez. The truncate head is almost imperceptibly 
expanded. Six long and fine cephalic setze surround the mouth, and in addition the 
male is said to possess a second row of subcephalic sete. The projecting oval lateral 
LL 
