420 PROCEEDINGS OF THE NATIONAL MUSEUM vol.90 



Family DIPHYLLOBOTHRIIDAE Liihe 



Genus LIGULA Bloch 



Cooper ^ refers all members of this genus to the one species: Ligula 

 intestinalis (Linnaeus), Cestodes apparently belonging here have 

 been found in two species of fishes of the Woods Hole region. 



LIGULA CHILOMYCTERI Linton 



Ligula chilomycteri Linton, Proc. U. S. Nat. Mus., vol. 19, pp. 788-789, pi. 1. 

 fig. 1, 1897. 



From Chilomycterus schoepji. 



LIGULA speciea 



Plate 60, Figure 4 



Specimen from Palinurichthys perciformis. — Collected August 17, 

 1904; three fragments of strobila, 27, 18, and 10. 5 mm. long, respec- 

 tively; maximum breadth 5.5 mm.; maximum thickness 4 mm.; mini- 

 mum breadth 2 mm.; from intestine, somewhat macerated. This 

 specimen (U.S.N.M. No. 8854) is represented in the collection by 

 two slides of transverse sections, the median and larger of which 

 measures 3.71 by 2.45 mm. There is a thin layer of delicate longi- 

 tudinal muscles next to the cuticle, followed in turn by a conspicuous 

 layer of longitudinal muscles surrounding the inner, parenchymatous 

 area. Thickness of cuticle about 0.005 mm., of outer parenchyma- 

 tous layer 0.63 mm., of longitudinal muscle layer 0.36 mm., of inner 

 parenchymatous area 0.63 mm. The muscle bundles of the con- 

 spicuous longitudinal muscle layer are, for the most part, fiat and thin; 

 cross sections of larger bundles are about 0.18 by 0.012 mm. 



What appears to be a unique feature of these sections is the occur- 

 rence of a band of longitudinal muscle fibers at each lateral margin 

 of the inner parenchymatous area extending from the region of the 

 nerve cord to a point corresponding to the marginal limit of the 

 layer of longitudinal muscles. These bundles are more or less ellipti- 

 cal in cross section; dimensions of one of the larger cross sections, 

 0.06 by 0.021 mm. (pi. 60, fig. 4). 



Family CYATHOCEPHALIDAE Nybelin 



Genus SPATHEBOTHRIUM Linton 



SPATHEBOTHRIUM SIMPLEX Linton 



Plate 60, Figure 5 



Spathebothrium simplex Linton, Trans. Amer. Micr. Soc, vol. 41, p. 118-121, 

 pi. 15, 1922 (from Liparis lipans) . 



Specimen from Microgadus tomcod. — Collected April 23, 1920, by 

 Vmal N. Edwards (U.S.N.M. No. 8856). Measurements in formalin: 



* Illinois Biol. Mon., vol. 4, pp. 306-318, 1919. 



