422 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 90 



Family TRIAENOPHORIDAE Lonnberg 

 Genus FISTULICOLA Luhe 



FISTUUCOLA PLICATUS (Rudolph!) 



Bothriocephalus plicatus Rudolphi, Entozoorum synopsis cui accedunt man- 

 tissa . . ., pp. 136, 470, 1819. 



Dibothrium plicatum (Rudolphi) Linton, Rep. U. S. Fish Comm. for 1887, pp. 

 746-750, pi. 3, figs. 1-6, 1890; Proc. U. S. Nat. Mus., vol. 20, pp. 430-431, 

 1897; Bull. U. S. Fish Comm., vol. 19, pp. 278, 448, 1901; vol. 31, pt. 2, p. 586, 

 1911. 



Fistulicola plicatus (Rudolphi) Coofer, Illinois Biol. Mon., vol. 4, pp. 377-380, 

 1919. 



Specimens from Xiphias gladius. — My record shows that 13 sword- 

 fishes were examined for Entozoa on seven dates in July in five 

 different years, and this cestode was present in practically every one, 

 1 to 9 strobilae present in each, 44 in all. The smallest strobila noted 

 measured 22 mm. in length and 1.5 mm. in breadth; the largest 240 

 mm. in length and 12 to 15 mm. in breadth throughout the greater 

 part of the length. The greatest breadth noted in any strobila was 

 20 mm. (U.S.N.M. No. 8861). 



The usual habitat of this cestode is the rectum of the host. The 

 younger specimens are simply attached to the mucous membrane and 

 are easily detached. The older strobilae are, as a rule, permanently 

 affixed, the anterior ends penetrating the intestinal wall. Thus, in 

 an example collected July 13, 1911, it was noted that the part that 

 lay free in the rectum of the host measured 70 mm. in length and 11 

 mm. in maximum breadth. The anterior end of the strobila, after 

 passing through the intestinal wall, continued in an elongated en- 

 cysted portion in the body cavity. When dissected out, this portion, 

 which had a diameter of 1 mm. in the intestinal wall and 1.5 to 3 mm. 

 in the portion that lay in the body cavity, measured 90 mm. long. 

 It was not complete, since a portion had been cut off and left in the 

 fish when the viscera were removed. 



Cooper (loc. cit., p. 380) records one specimen in the collection of 

 the University of Illinois, taken by Vinal N. Edwards from Mola mola 

 at Woods Hole. 



Genus ANCISTROCEPHALUS Liihe 



ANCISTROCEPHALUS MICROCEPHALUS (Rudolphi) 



Dibothrium microcephalum Rudolphi, Linton, Rep. U. S. Fish Comm. for 1887, 

 pp. 736-745, pi. 2, figs. 5-18, 1890; Bull. U. S. Fish Comm., vol. 19, pp. 282, 

 465, 1901; BuU. U. S. Bur. Fish., vol. 31, p. 586, 1911. 



Ancistrocephalus microcephalus (Rudolphi) Linton, Fisheries and marine biolog- 

 ical survey. Union of South Africa, Rep. No. 3, for 1922, pp. 12, 13, figs. 

 35-40, 1924. 



For references to literature see Stiles and Hassall, Hyg. Lab. U. S. Public Health 

 Serv. Bull. 8o, pp. 101, 102, 198 (Anchistrocephalus microcephalus, Ancistro- 



