400 TRICOMA AND OTHER NEW NEMATODE GENERA, 



line. Their average length is equal to the width of the head. 

 The lateral organs are roundish, but are slightly broader than 

 long ; they are one-third as wide as the head. Two flat hairs of 

 unequal length grow from the inner margin of the anterior border 

 of each lateral organ. The larger of these hairs, the dorsal, is 

 equal in length to the cephalic setse. It is from these peculiar 

 hairs that I have named the genus. The lips are three in number 

 and apparently of large size ; each is surmounted by a lew 



mammillate conical papilla. The pharynx is 

 ir_y*'=^'T^v::z*^I| narrow, almost tubular, but expands very slightly 



half-way back, and ends opposite the anterior 



fW\T""^/ border of the lateral 



■ifj^ coma cephalata. 11, head of Organs. ineie aie no 

 same more highly magnified. „„ The fvlindricrtl fpso- 



III, the same worm natural ^J^^- -^"^ Cyunciricai oeSO 



size. ly. tail end of same phagus is one-half as wide 



worm highly magnified. i & 



as the neck, and is sepa- 



a, one of the three labial 



papillae. rated from the intestine 



-) b, cephalic setse. t • . . 



/ c, pharynx. by a distuict constriction. 



^ d, lateral organ. . . 



m e, posterior end of oesopha- ihe cardia IS rather large. 



/, blind eiid anterior testicle. The intestine is two-thircls 

 ■•••/ a, junction of testicles. . ^ , i i i ^ 



A, blind end posterior testicle. aS Wide as the body, and 



i, 7, ventral accessory organs (?). . t c- ^ n 



t\ ^i o Ar.ieftsiiicuium. IS composed ot large cells, 



I, anus. in : £- 1 • 



J—\°hz\ V?t "'.anus. only four to five being 



If. ^\3!^\ \ required to build the cir- 



j ~"t9] I cumference. I could discover no ventral gland in 



the only specimen examined. The longitudinal 

 JY / fields are one-fourth as wide as the body. 

 Large cells occur at frequent intervals between 

 the intestine and the body wall. The tail is arcuate, conical, 

 and apparently destitute of caudal glands. The two equal 

 linear slightly arcuate spicula have a length equal to that of 

 the anal body-diameter, and when seen in profile make an angle 

 of forty-five degrees with the axis of the body. The proximal 

 ends are slightly expanded. There are no pa|)ill8e before or 

 behind the anus. Two low ventral swellings occur in front of the 

 anus ; that nearest the anus is removed a distance twice as great 



