XI. B, 6 



Boynton and Wharton: Parasitic Infestation 289 



labag, Camarines, and are listed as specimen No. 106, helmin- 

 thological collection, College of Medicine and Surgery. 

 Oesophagostomum sp. 



Worms of this genus were also collected from the cow. While 

 they more closely resemble O. radiatum than any other described 

 form, it is believed that they should be placed in a separate 

 species. The mouth collar is more prominent than in 0. 

 radiatum, the cervical inflation of the cuticle is strongly pro- 

 nounced, and the body is slightly larger than that of O. 

 radiatum. The externodorsal rays of the bursa of the males 

 originate very close to the root of the dorsal ray; and the 

 external divisions of the dorsal ray are knob-shaped, while 

 the internal divisions are very long and slender. 



The above were collected from the caecum of a cow, at Mina- 

 labag, Camarines, and are listed as specimen No. 104, helmin- 

 thological collection. College of Medicine and Surgery. 



TRICHOSTRONGYLID^ 

 Haemonchus contortus (Rudolphi, 1803) Cobb, 1898. 

 Strongylus contortus. 



This is the conmion "wire worm" of cattle, sheep, and goats. 

 The head is small and bears a minute buccal lancet. There 

 are two cervical spines about 0.3 to 0.4 millimeter from the 

 anterior end of the body. The oesophagus is claviform. The 

 body is long and slender and is attenuated toward both ends. 



These worms were found in the fourth stomach of both the 

 goat and the cow at Minalabag, Camarines, and are listed as 

 specimens Nos. 102 and 108, helminthological collection, College 

 of Medicine and Surgery. 



Nematode sp. — Several female worms, 30 to 35 millimeters in 

 length and having a diameter of about 0.6 millimeter, were col- 

 lected from the fourth stomach of the cow. They probably 

 belong to the family Trichostrongylidse, although they could not 

 be identified further. They are filled with large thin-shelled 

 eggs averaging 107 microns in length by 44 microns in diameter. 

 The vulva is situated about 1 millimeter in front of the anus, and 

 the tail is short and is sharply pointed behind the anus. They 

 are listed as specimen No. 115, helminthological collection, College 

 of Medicine and Surgery. 



TRICHINELLID^ 

 Trichuris ovis (Abildgaard, 1795) Smith, 1908. 

 Trichocephalus affinis. 

 This is the common whipworm of cattle and sheep. Specimens 



