Species o/Monhystera {Nematodes). 



All 



the intestine, which follows it. The narrow portion of the 

 bulb is anterior. At the sides of the anterior neck of the 

 bulb there are two large spherical or ovoid cells, with granular 

 contents, and perhaps of glandular nature (fig. 3, G.). The 

 walls of the chyle-intestine are composed of a single layer of 

 large oblong cells rilled with rather dark brown granules, and 

 lined with the usual cuticular layer. 



The vulva (fig. 1, V.) is situated at about the beginning 

 of the last third of the body. The ovary is unpaired, and 

 composed of a single row of ovarian cells. Its apparent 



Fio-. 3. 



-Int. 



Monhystera'wilsoni: anterior end, showing B., bulb of oesophagus; 

 G., gland-cells (?) at sides of the bulb ; Int., chyle-intestine ; 

 iV., nerve-ring ; Oes., oesophagus. 



commencement is shortly behind the bulb of the oesophagus, 

 but in reality its anterior end is bent back upon itself for 

 a short distance. In the uterus a single row of large ova 

 can be seen (fig. 1), generally in all stages of development, 

 from unsegmented eggs at the anterior end to fully-developed 

 embryos at the posterior end. Sometimes there is one egg in 

 each stage of segmentation, so that the complete develop- 

 mental history can be seen by simply following along the 

 uterus from one egg to the next. The last 3-5 eggs 

 generally consist of fully-formed embryos still enclosed in 



