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Show microscope not very sharp. The head is rounded dorsally and flattened ventrally ; it slopes down gradually to the neck. 1 9 0 5 . ] MR. A. E. SHIPLEY ON ENTO-PARASITES. 2 5 1 Text-fig. 52. Porocephalus lierpetodryados.- A. Entire worm. B. Head, much magnified. This form came from a specimen of Herpetodryas cctrinatus, 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 Trinidad, Guadeloupe and St. Vincent. NEMATODA. A n g io s t o m u m SEitPEXTicOLA von Linstow. v. Linstow, Centrbl. Bakter. xxxvii. 1904, p. 678. Von 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 Rhabditis-like 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. A SC A HIS ANG USTICOLLIS Molin. Molin, SB. Ak. Wien, xl. p. 336. v. Drasclie, Verb. Ges. Wien, 1883, p. 209. Mobius's specimens came from the coats of the intestines of Buteo vulgaris, the Buzzard. Von Drasche gives two views of the |