168 (S-S.470) THE MONONCHS 



front of it. The tail of the male is somewhat like that of the female but dimin 

 ishes very suddenly behind the anus. Five pairs of innervated papillae have been 

 seen on the tail of the male, two of them, however, exceedingly inconspicuous and 

 easily overlooked : Of the three more conspicuous, one ventrally submedian pair 

 is located a short distance behind the anus ; a second dorsally sublateral pair occurs 

 a little behind the middle of the tail, and a third subventral pair occurs a short 

 distance in front of the spinneret. Of the two more inconspicuous pairs, one is 

 nearer the spinneret than that just mentioned, and the other, lateral, and slightly 

 behind the middle of the tail. The arcuate spicula are about one and one-fourth 

 times as long as the anal body-diameter. At their widest part, near the middle, 

 they are about one-fifth to one-sixth as wide as the corresponding part of the 

 body and thence taper in both directions ; they are not cephalated. The distal ends 

 are obscurely two-pronged. The obscurely bifurcated accessory pieces are of 

 typical form and size, about one-third as long as the spicula and about one-fourth 

 as wide as long. Fourteen rather closely approximated, equidistant supplementary 

 organs occur in front of the anus, occupying a distance about three times as great 

 as the length of the tail. Internally the organs seem to be short, broad tubes of 

 slightly varying diameter ; these are probably slightly protrudable. The protrudable 

 portion is not hispid as is the case in M. major; on the contrary, it appears to be 

 smooth. The anterior one and the posterior three of these organs are not so well 

 developed as the others, that near the anus being reduced to a mere innervation ; 

 the distance between this latter and its nearest neighbor is about twice as great as 

 between any other adjacent members of the series. These organs give to the ven- 

 tral contour a crenate or serrate appearance. The anal muscles are prominently 

 developed. The ejaculatory duct is often filled with elongated spermatozoa, some- 

 what resembling those of Dorylaimus, and similar in form to those figured by 

 Dr. de Man for M. gerlachei. Each one may be one-fourth as long as the body is 

 wide, or thereabouts. There are two outstretched testes. The blind end of the 

 anterior is about as far behind the base of the neck as the latter is behind the anter- 

 ior extremity. The blind end of the posterior seems to lie about twice as far in 

 front of the foremost supplementary organ as this latter is in front of the anus. 

 The spicula have a median stiffening piece, and their proximal ends lie toward the 

 dorsal side of the body. 



Found about the roots of plants on the Arlington Farm, Virginia, U. S. A. Re- 

 sembles M. minor, but in the proportions of the pharynx there are notable differ- 

 ences. The walls are here thicker; the amphids are larger and farther back; the 

 lips and onchus are strongly developed, so that when the pharynx is closed the 

 cavity appears smaller than in minor. Opposite the anterior supplementary organ 

 there is a fibrous ring, probably nervous. A similar structure has been noted in 

 other species. There probably exist at this point in the body special nerve com- 

 missures. Flemming solution to glycerine. Fig. 49 (near bottom of previous page). 

 36. M. subsimilis, n. sp. Striae of the cuticle more or less 

 easy of resolution. Lining of the resophagus strongly developed, 

 3. 10. 34. Y 96. occupying three-fifths of the 



3.1 3.6 4. 3.8 2.6 ' m longitudinal optical section. 

 Anus slightly elevated, especially the anterior lip. The scat- 

 tered granules in the cells of the intestine are small, but varia- 

 ble in size, and do not give rise to tessellation. The more or 

 less arcuate tail is conoid to the blunt terminus, which is about 

 one-fourth as wide as the base of the tail. A ventrally sublateral innervated papilla 

 occurs on each side near the middle of the tail. There are no caudal glands. De- 

 scription derived from a single young female. 



