CHORONEMA, IOTALAIMUS 



239 



M&ato 



the city of Washington, U. S. A. Flemming to glycerine jelly. This species, of 

 which but a single young specimen has been seen, has the general appearance 

 of being a deteriorated Cephalobus or Diplogaster. The specimen figured was 



Mi yung and in process 

 of molting. In the 

 left-hand illustration 

 the excretory pore, 

 ex p, is shown in its 

 proper position. Nearly 

 opposite is shown 

 the cast-off duct and 

 pore which has come 

 into its present posi- 

 tionbyrotation of 

 the loose, shed cuticle. 

 Similarly, in the right- 

 hand figure the 

 sloughed anal opening 

 is shown opposite the 

 anus, on. The caudal 

 pores eluded observa- 

 tion, but that they were 

 present is shown by the 

 . two markings at ppl 

 - m in the cuticle that has 

 been shed. Probably 

 the cuticle has length- 

 ened, as usual, in being 

 shed, and the pores pre- 

 JPft sumably occur not far 

 behind the anus, not- 

 withstanding the fail- 

 ure to see them. Ph, 

 while indicating the 

 ....ttlt (X position of the pharynx, 

 also indicates an ele- 

 ment that comes to 

 the surface ante- 

 riorly (amphid?). Fig. 



X 750 14. 



15. lotalaimus striatus n. sp. Cuticle naked; the striae interrupted by well- 

 developed crenate wings one-fifth as wide as the body. Between the wings is a 

 straightish refractive line, due to a continuous, cuticular structure. On some 

 specimens the outer contour of the wings consists of a doubly refractive line. 

 There appear to be four faint, submedian cephalic papillae. The amphids are 

 faint. It is possible that there is a vestigial pharynx. The oesophagus is 

 very faintly cephaloboid in form. The anterior two-fifths is cylindroid and 

 averages only about half as wide as the corresponding portion of the neck; thence 

 backward the oesophagus diminishes gradually so that opposite the nerve- 

 ring it is only about one-fourth as wide as the middle of the neck. It continues 

 to have this diameter for some distance, but finally begins slowly to expand, so 



exp 



