220 The Philippine Journal of Science 1918 



more or less retractile and movable from side to side, the an- 

 terior or cephalic projection measuring 1.2 millimeters in length 

 and the posterior 0.5 to 0.9 millimeter. 



The mouth is at the end of the cephalic projection and is 

 surrounded by three lips, each of which bears a terminal papilla. 

 It opens into a rounded buccal cavity about 20 p. in diameter. 

 The oesophagus extends throughout the length of the projection 

 and opens into a large sacklike intestine, w^hich continues through 

 the body and into the caudal projection, where it opens about 

 0.2 millimeter from the posterior end. The intestine generally 

 contains a mass of black coloring matter, so that it can be easily 

 followed through the body. At the junction of the oesophagus 

 with the intestine is a mass of unicellular glands. 



The genital organs occupy the greater part of the body and 

 consist of a mass of much coiled and twisted tubes. The uteri 

 are double and unite to form a long vagina, which opens ventrally 

 at the junction of the caudal extremity with the body. Just 

 anterior to the opening there is a round sacklike diverticulum 

 of the vagina. The uterus and the vagina with its diverticulum 

 are always filled with eggs in different stages of segmentation. 

 The eggs are oval and thin-shelled and measure 48 to 56 jj. in 

 length by 26 to 30 fx. in breadth. They contain a coiled embryo 

 when they are ready to leave the body of the parent worm. 



Male. — Length, 4 to 5 millimeters; diameter, 0.11 to 0.2 milli- 

 meter. The body is threadlike and white and is transversely 

 striated. Along each lateral and median line is a single row 

 of small spines, which point backward. These spines begin just 

 back of the buccal cavity and extend beyond the level of the 

 anus. In the anterior and posterior regions they are about 20 

 ^ apart, but in the middle of the body they are separated by as 

 much as 115 fx. 



In the male the alimentary canal is distinctly different from 

 that of the female. It is divided into a short buccal capsule, 

 an oesophagus composed of a short, slender, muscular portion and 

 a long, wide, posterior portion that opens into a tubelike intes- 

 tine; the latter does not show any of the black color that is so 

 prominent in the female intestine. The anus opens about 0.25 

 millimeter from the tip of the tail. 



There are two unequal spicules, a short sharp-pointed one 115 

 fj. long and 4 /x in thickness and a long one measuring 320 /n in 

 length by 15 ^ in thickness and vdth a rounded end. 



Habitat. — The female worms lie embedded in the gastric 

 glands of the proventriculus. They can be seen from the outside 

 as small, round red spots in the walls. The males lie either free 



