EXPLANATION OF PLATES XVIII and XIX Fig. 1. Diagram of the right lateral line from the smaller fish. Fig. 3. A crest from the longitudinal series showing an "opening." Outlined with camera lucida. Zeiss objective A, ocular no. 4. Fig. 4. A crest from the longitudinal series showing the cylindrical cartilage projecting above the surface as a nodule (c.n.) Magnification as for fig. 3. Fig. 5. A section from the longitudinal series showing a crest in sagittal section and a free nodule (n). Same magnification as fig. 3. Fig. 6. A section from the transverse series showing an "opening." Outlined with camera lucida Zeiss objective D, ocular no. 2. Fig. 7. Section from the transverse series showing a pit organ (f.p.) and passing thru the anterior part of a branchlet (br.), showing the continuation of the canal cartilage out around the branchlet. Drawn with the same magnification as fig. 6. X=posterior to this point the nodules were not indicated. V indicates places where line was cut. A NEW TREMATODE, ACANTHATRIUM NYCTERIDIS, NOV. GEN., NOV. SPEC., FROM THE LITTLE BROWN BAT.1 BY ERNEST CARROLL FAUST The material described in this paper was taken from the small intestine of a female Nycteris borealis-borealis (Müller). The bat was found in the vicinity of Urbana, Illinois and brought to the writer during the summer of 1918. With the female were two suckling young which were uninfected. Of the ten individuals of the new parasite found, two were studied alive and the remainder preserved and studied as totos and sectioned material. In the living specimens the details of the excretory system were worked out and the process of fertilization observed. This species conforms to the previous diagnostic rules prescribed for the genus Lecithodendrium in the shortness of the digestive ceca, the position of the uterine loops, the general type and position of the testes and vitellaria and in the absence of a muscular cirrus. However since the structure of the organs immediately surrounding the genital pore are important criteria on which generic diagnosis is made, it seems necessary to create a new genus to include this species and Lecithodendrium sphaerula Looss 1896, which possess in common a genital atrium lined with numerous lanceolate spines. I propose the name Acanthatrium for this new genus. Diagnosis of Acanthatrium nov. gen. Small-sized Brachycoeliinae, spherical to pyriform, with a genital atrium lined with numerous integumentary spines; prostate glands numerous; testes preacetabular, in a plane with the genital pore; vitellaria anterior to the digestive ceca; excretory system with four groups of flame cells of three each for each half of the body; in intestine of bats. Type species: A. nycteridis. 'Contributions from the Zoological Laboratory of the University of Illinois, No. 138, and from the Department of Pathology, Peking Union Medical College. |