13 2(S-S.434) 



THE MONONCHS 



which corresponds very closel} 



with that of the type species of the 

 genus, M. truncatus Bastian, and espec- 

 ially with M. papillatus Bastian. 



Skin or Cuticle 



Strics. While the skin of these nemas 

 usually described as smooth and 

 without striations, yet minute trans- 

 verse striae are probably always present, 

 though difficult of resolution except in 

 the new species reversus and similis. 

 Using a good objective of the highest 

 power under favorable conditions, I 

 have almost invariably been able to see 

 these striae, and as my examinations 

 have embraced the great majority of 

 the known species, it seems probable 

 that any specimen will reveal them if 

 examined with sufficient care. These 

 transverse striae, all alike on a given 

 specimen, are never sufficiently marked 



, , FIG. 2. Female 

 of a typical mononch, 



par Mononchus longi- 

 , caudatus, a syngonic 

 form. This individ- 

 ual had been feast- 

 ing on other nemas, 

 t h e remains of 

 which are shown in- 

 side the intestine. 

 Only the anterior 

 half of the sexual 

 organs can be seen 

 in the illustration; 

 an entirely similar 

 branch is hidden on 

 account of the coiled 

 attitude of the body. 

 The lettering of 

 the illustrations is 

 similar throughout 

 and is explained at 

 the bottom of page 

 129. The anatomy 

 and histology o f 

 various newly dis- 

 covered features are 

 shown: 



GJsophageal glands 

 (gl. sal.), the pore 

 mlr Inf through which the 

 glands empty into 



-. theossophagus (par.), 

 syngonic sperm 



j, (spm.), formation of 



"" polar body (ov.frt.), 

 ingested protozoon 

 (ing.), etc. 



to disturb the plain, even contour of the body. It is rarely possible to 



