288 The Philippine Journal of Science 191 e 



NEMATODES 

 STRONGYLID^ 



Bunostomum phlebotomum (Railliet, 1902). 



Strongyhis radiatus, Dochmius radiatus, Uncinaria radiata, Mono- 

 dontus phlebotomus. 



These are small white worms with a large, armed buccal 

 capsule, bent dorsally. There is a short, dorsal buccal tooth; 

 a pair of ventral buccal teeth; and a pair of small, subventral 

 lancets; all attached to the base of the capsule. There are six 

 circumoral papillae and a pair of short, blunt cervical papillae 

 opposite the anterior portion of the oesophagus. The oesophagus 

 is enlarged at the posterior end. 



The males are 10 to 14 millimeters long and about 0.5 milli- 

 meter in thickness. The dorsal lobe of the bursa copulatrix is 

 shorter than the lateral lobes. The dorsal ray is asymmetrical, 

 coming off from the base of the left lateral ray and giving off the 

 externolaterals asymmetrically. The spicules are long and 

 filiform. 



The females are 15 to 20 millimeters in length and a little 

 thicker than the males. The posterior end of the body is at- 

 tenuated and terminates in a slender, bluntly pointed tail behind 

 the anus. The vulva is situated a little in front of the middle of 

 the body. 



The above were collected from the ileum and the fourth stomach 

 of a cow (Bos tauriis) at Minalabag, Camarines, and are listed as 

 specimen No. 110, helminthological collection. College of Medicine 

 and Surgery. 



Oesophagostomum columbianum (Curtice, 1890). 



This is the common Oesophagostomum of sheep and goats. 

 It undergoes its development in nodules in the walls of the 

 intestines and leaves these nodules only when it has reached 

 the adult stage, at which time it passes into the lumen of the 

 intestine, where copulation and egg-laying occur. 



The mouth is surrounded by a slightly inflated mouth collar. 

 There are well-developed lateral membranes extending posteriorly 

 from the transverse groove along the whole length of the body. 

 A pair of cervical papillae are present in front of the middle of the 

 oesophagus. 



The males are 10 to 16 millimeters long and have a bursa. 

 The females are 14 to 20 millimeters long with the vulva close 

 to the end of the tail. 



The above were collected from the intestine of a goat at Mina- 



