A CONTRIBUTION TO THE ANATOMY OF DINOBOTH-RIUM, A GENUS OF SELACHIAN TAPEWORMS; WITH DESCRIPTIONS OF TWO NEW SPECIES. By Edwin Linton, 0/ the University of Missouri, Colwnbia, Missouri. In 1S89 P. J. van Beneden described an interesting cestode from the mackerel shark (Lamna cornuVica) under the name Dinohoth-num septaria} The species has been recorded from the same host by Loennberg^ and b}^ Scott.^ Loennberg gives detailed description of the scolex and of immature proglottides. Scott publishes a brief description of the species and a protograph of a specimen collected by him. Strobiles with adult, or ripe, proglottides were not seen by any of the above-named authorities. I am indebted to Dr. Maurice C. Hall, of the Zoological Division of the United States Department of Agriculture, for photographic copies of Loennberg's papers. Tliis paper is a contribution from the laboratory of the United States Bureau of Fisheries, Woods Hole, Massachusetts, and the zoological laboratory of the L^niversity of Missouri. On September 1, 1903, 1 collected some cestodes from a small man-eater shark, of which no description was published, but a record was made,^ as follows: Dinobothrium septaria Beneden. Host: Carcharodon carcharias Linton, MS A t3r[3ographical error appears in the spelling of the generic name, which is printed ^'Dinobothrium." During the summer of 1920 I obtained three specimens of a cestode from the bone shark, which also belong to the genus Dinobothrium . Although at first disposed to refer the cestodes of these two lots to the species D. septaria, I found difficulties of two sorts present-JBuU. Acad. roy. d. Belg., vol. 17, pp. 68-74, figs. 1-3. » Zwei Parasitcn aus Walfischen und zwei aus Lamna comubica. K. vet. Akad. Handl., Stockholm , vol. 24, 1898, pp. 25-28, figs. 11 and 12. Ueber einige Cestoden aus dem Museum zu Bergen, 1898, pp. 19-23, fig. 10. » Twenty-sixth Ann. Rep. Fisheries Board of Scotland, pt. 2, p. 84, fig. 4, 1898. <Bull. Bur. Fish. (1911), vol. 31, pt. 2, p. 58G. No. 2401.— Proceedings U. S. National Museum, Vol. 60. Art. 6. 1
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