24 Cobb — Nematodes, mostly Australian and Fijian. 



the base, and one well-developed and projecting dorsal tooth extending three-fourths 

 the distance to the lips ; according to Butschli, 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 papillse, 

 one opposite the proximee 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. 



Hab. — Found among decaying masses on the surface of the river Main at 

 Frankfort, Germany. 



12. D. macrodon, Oerley. il \ ^I's '%i. ^I'e '■'^'°'°- Cuticle with about one thousand 

 transverse striae; neck nearly cylindrical, convex-conoid near the head; head rounded 

 in front ; no cephalic setae ; 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 oesophagus by a deep and narrow constriction ; excretory pore at 10%, that 

 is, somewhat in front of the cardiac constriction ; tail conical from the inconspicuous 

 anus; terminus wider than usual, i.e., 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. 1T3-7 — 2-5 2-5 2- i'™"- Male 

 tail conical, its terminus hair-fine ; papillae as follows : one pre-anal pair, submedian, 

 opposite the proximae ; 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 proximae enlarged and apparently furcate. 



Hab. — Found in Hungary. 



13. D. rivalis, Ley dig. 1-3 1-5 i-e — 2^^- ^■^'"™- The skin is marked by about 

 thirteen hundred transverse striae. The truncate head is almost imperceptibly 

 expanded. Six long and fine cephalic setae surround the mouth, and in addition the 

 male is said to possess a second row of subcephalic setae. The projecting oval lateral 



