54 NORTH AMERICAN 



3-2 3-3 



possessed four supplementary organs, the additional one being some little 

 distance in front of the others, which were arranged as illustrated. 

 Sometimes there are only two of these organs, one smaller than the other. 

 The cuticle of the ventral surface is slightly thickened and elevated where 

 it is pierced by these tubular organs, which appear in some instances to be 

 slightly exserted. Apart from these preanal supplementary organs, there 

 are ventrally submedian papillae on the tail ; one pair near the middle, an- 

 other pair half way between these and the anus, and a third pair part way 

 from that first mentioned to the terminus. There is a fourth pair indistinctly 

 to be seen just behind the anus; these are closer together than the members 

 of the other pairs. Furthermore there are one or two very small pairs near 

 the terminus, but perhaps these may partake more of the nature of hairs 

 than of papillae. Just in front of the anus there is a single ventral almost 

 setose papilla. There occur in front of the anus at least two pairs of ven- 

 trally submedian papillae. These are located one just in front of the pos- 

 terior supplementary organ and the other just behind it. Most of these 

 features are not easy to decipher, very careful observation being necessary to 

 enumerate the papillae as above. There are two testicles, one anterior to 

 the other, the anterior being outstretched and extending forward, the pos- 

 terior being reflexed near its middle, so that its blind end lies somewhere 

 near the junction of the two. The anterior one of this pair is connected 

 with the seminal vesicle by a tubular portion, which lies alongside the re- 

 flexed posterior member. 



Habitat: Arlington, Va. Flemming solution to glycerine. 



DORYLAIMUS, Dujardin, 1845. 

 Fig. 12, Plate V. 



43 



11. Dorylaimus fecundus, n.sp. : '- 3.4 mm. 



.5 i.i 1.6 1.9 1.2 



The thin layers of the transparent, colorless, naked cuticle are traversed 

 by exceedingly fine, plain, transverse striations resolvable with the highest 

 powers of the microscope under favorable conditions. Longitudinal striations 

 are visible throughout the length of the body. The presence of amphids is 

 indicated by a transverse marking immediately behind the lip region, and 

 somewhat in front of the guiding ring of the spear. The anterior contour 

 of each organ is a transverse line about three-fifths as long as the corre- 

 sponding portion of the head is wide. Extending backward from this are 

 lateral contours which approach each other slightly and end indefinitely. The 



