Bert B. Babero

A new species of whipworm from the rodent Akodon longipilis in Chile.

JENSEN, W. A. 1962. Botanical Histochemistry. W. H. Freeman, San Francisco. 408 pp. LAETSCH, W. M. 1969. Relationship between chloroplast structure and photosynthetic carbon-fixation pathways. Sci. Prog. (Oxford), 57: 323-351. MOHAPATRA, S. C. & JOHNSON, W. H. 1974. Microscopic studies of bright leaf tobacco. III. Scanning electron microscopy of deparaffinized sections of tobacco leaf. Tob. Sci., 18: 80-82.

Further studies on helminths of the opossum, Didelphis virginiana with a description of a new species from this host.

Marsupial parasites have been subjected to extensive investigation throughout the Americas. In North America, however, helminthological surveys of the opossum, D. virginiana, have been comparatively limited. Such studies include those of Dikmans (1931, Louisiana), Chandler (1932, Texas), Reiber and Byrd (1942, Tennessee), Byrd, Reiber, and Parker (1942, Tennessee, Georgia, and Illinois), and Babero (1957, Illinois). As a result of these investigations, considerable information relative to the bionomics of certain parasites and their occurrence and prevalence in marsupial hosts has been accumulated. For the most part, helminths of the opossum (Didelphis spp.) do not seem to be limited to a given geographical region since many of them frequently have been reported from animals that were inhabitants of widely separated areas. However, because of the endemicity of certain helminths of the opossum, additional studies in this regard seem warranted in order to provide further information concerning their geographical distribution, ecology, and hostparasite relationships. During routine faunal investigations, the writer examined 26 opossums. The animals were collected over a period of a year and a half from four widely separated areas within the state of Georgia (Fort Valley, 6; Dublin, 2; Fort Stewart, U.S. Army Reservation, 17; Perry, 1). Fifteen genera comprising about 17 species of helminths were recovered from hosts collected. This material consisted of about 11 species of nematodes (including 1 described herein as new), 3 of trematodes, 1 of cestode, and 2 of Acanthocephala. Several of the parasites collected are of particular significance either because of their pathogenicity to the opossum or their infrequent occurrence in this host-species. Brief discussions of these worms are included. Measurements are reported in millimeters unless otherwise stated.

THE HELMINTH FAUNA OF CHILE: IV. NEMATODES OF THE GENERA Anisakis DUJARDIN, 1845 AND Phocanema MYERS, 1954 IN RELATION WITH GASTRIC ULCERS IN A SOUTH AMERICAN SEA LION, Otaria byronia1

A gastric ulcer was diagnosed in a South American Sea Lion, Otario byronia, captured along the northern coast of Chile. Species of Anisakis and Phocanema were found to be associated with the lesions. A discussion of the histopathologic damage observed is presented, along with probable etiology of the ulcer.