Apr. 17, i9i6 Two New Nematodes 123 



conditions evidently being a function among other things of the age or condition of 

 tlie cuticle. There are lateral wings, though these consist simply of a pair of slightly 

 modified longitudinal striae. 



The conoid neck becomes convex-conoid toward the truncated head, which is not 

 set off in any way. There are six comparatively well amalgamated lips, each of which 

 bears two innervated papillae, one on the forward surface and somewhat forward point- 

 ing, and one on the outer surface and somewhat outward pointing. The anterior of 

 these two papillae is extended beyond the surface of the lip in the form of a minute 

 seta or innerv^ated papilla, and corresponds to the cephalic seta of other species of 

 Diplogaster. The contour of the lip is not much disttu-bed by the presence of the 

 posterior papilla, which is sometimes very difficult to see. Close behind the lateral 

 papillae or setae there are minute openings in the cuticle, which in character closely 

 simulate the amphids in some otlier species of Diplogaster, notably those of D. fictor. 

 No doubt these are really the outward expression of minute amphids. Distally the 

 lips have thin extensions which can close together over the pharynx in such a fashion 

 that the front of tlie head is comparatively flat, though the tips of these lips may be 

 recurved and point forward so as to make an exceedingly minute elevation at the 

 middle of the front of the head. The latter has its front surface on the whole very 

 slightly depressed. 



The pharynx is about as deep as the front of the head is wide, and bears near its 

 base on the dorsal side a relatively large, rather acute movable conoid tooth or onchus, 

 which reaches about one-third the distance to the lips when the latter are closed, 

 but which is relatiA^ely farther forward when the mouth is open. In addition there 

 is a very much smaller sub median projection that undoubtedly may be denomi- 

 nated a rudimentary onchus. When the lips are closed the pharynx is a little wider 

 at the base than anteriorly. At the base of the lips, opposite the posterior circlet 

 of labial papillae, the width of the pharynx is a little more than one-third that of the 

 corresponding part of the head. Posteriorly, however, the width appears to be nearly 

 three-fifths that of the corresponding portion of tlie head, at least when the head is 

 viewed in profile. The walls of the pharynx are thin but refractive and fairly well 

 ceratinized. The surface of the dorsal onchus is more highly ceratinized than that 

 of other portions of the pharynx. Both the onchus and the wall of the pharynx have 

 a yellowish or brownish color like that of the spicula. The end of the esophagus 

 receives the base of the pharynx and is at once fully two-thirds as wide as the corre- 

 sponding portion of the head. It continues to have the same diameter for some dis- 

 tance, then begins to expand and continues to do so to some^vhat behind the middle 

 of the neck, where it rather suddenly diminishes in diameter in such a way that it 

 is proper to speak of a median bulb, although the anterior end of this bulb is not 

 very distinctly set off by constriction from the anterior esophageal tube. This bulb 

 contains an elongated valvular apparatus which is about one-third as wide as the bulb 

 itself. This latter is three-fourths as wide as the corresponding portion of the neck. 

 Notwithstanding the rather massive character of this median bulb, the succeeding 

 portion of the esophagus is only about one-fourth as wide as the corresponding portion 

 of tlie neck. However, it soon begins to widen and forms a somewhat pyriform 

 cardiac bulb three-fourths as wide as the base of the neck. This bulb does not con- 

 tain any very evident valvular apparatus, though in it there are faint indications of 

 a modification of the esophageal lining. The intestine joins the posterior surface of 

 the cardiac swelling, and at this point is about one-third as wide as the correspond- 

 ing portion of the body. There is no very distinct cardia. The intestine widens 

 out rather gradually and attains a width at least half as great as that of the body. 



The tail end of the female begins to taper from some distance in front of the anus. 

 This latter is slightly raised, especially its broader posterior lip. Behind the anus 

 the tail diminishes somewhat more rapidly for a short distance and tliereafter tapers 

 regularly to the hairfine terminus. From the anus the rectum, which is about as long 



