1905.] MR. A. E. SHIPLEY ON ENTO-PARASITBS. 251 



microscope not very sharp. The head is rounded dorsally and 

 flattened ventrally ; it slopes down gra'lually to the neck. 



Text-%. 52. 



Forocephalus lierpetodryados. — A. Entire worm. B. Head, much magnified. 



This form came from a specimen of Herpetodryas carinatv,s, 

 probably from the lungs. The particular specimen was killed in 

 Honduras, but this species of snake extends in South America 

 east of the Andes to the Rio de la Plata, and is found in Tiinidad, 

 Guadeloupe and St. Vincent. 



NEMATODA. 



Angiostomum SERPENTicoLA von Liustow. 



V. Linstow, Centrbl. Bakter. xxxvii. 1904, p. 678. 



Yon Linstow describes the females which in this genus become 

 hermaphrodite whilst living in the lungs and pleural cavities of 

 Amphibia, Reptiles, and more rarely Birds.- The larvae develop 

 in or on the earth, and form a Ehabditis-\ike bisexual generation 

 in those species whose life-history is known. These specimens 

 were viviparous, the uterus being crowded with young embryos. 



Numerous specimens from the lungs of the " Hog-nosed " 

 Snake, Heterodon platyrhinus. 



ASCARJS ANGVSTICOLLIS Molin. 



Molin, SB. Ak. Wien, xl. p. 336. 

 V. Drasche, Yerh. Ges. Wien, 1883, p. 209. 

 Mobius's specimens came from the coats of the intestines of 

 Buteo vulgaris, the Buzzard. Yon Drasche gives two views of the 



