424 PROCEEDmCS of the national museum vol.90 



Numerous in wall of stomach and intestine, contractile, 1 to 3 mm., 

 numerous coarse granules in. parenchyma, characteristic vase shape 

 when at rest or under pressure. 



Very numerous, some encysted, some free, serous coat of stomach 

 and intestine, mostly slender, chalky white, very contractUe. 



Numerous in walls of stomach and intestine and muscles in vicinity 

 of backbone. 



July 28, 1920: Filefish, 30 cm. long, m very poor condition. A 

 large number of transparent cysts on the viscera, approximating in 

 bulk that of the viscera proper (see Proc. U. vS. Nat. Mus., vol. 64, 

 art. 21, p. 79, 1924). The muscular tissue in all parts of the body 

 was peppered thickly with these plerocerci. Surrounding many of 

 the larvae in the muscle tissue were thickish cysts that yielded bubbles 

 with acid. Larvae very active wavelike enlargements beginning at 

 anterior end and passing to posterior end. Length variable, extending 

 to 4 nma. or more, in which case they became very thin, 0.03 to 0.05 

 mm. in breadth. These cysts were very abundant in the wall of the 

 alimentary canal, especially on and in the wall of the esophagus. 



Family PTYCHOBOTHRIIDAE Luhe 



Genus BOTHRIOCEPHALUS Rudolph! 



BOTHRIOCEPHALUS SCORPU (MUller) 



Plate 60, Figure 8; Plate 61, Figures 9, 10 



An extensive s3aionymy of B. scorpii is given in Cooper's account of the species; 

 Illinois Biol. Mon., vol. 4, pp. 384-400, 1919. 



Cestodes belonging to the genus Bothriocephalus and referable to 

 B. scorpii or B. clamceps were found in many species of fishes of the 

 Woods Hole region. 



When, on account of the immaturity of the strobila or the unsatis- 

 factory condition of the material, determination of the species de- 

 pended upon the character of the scolex and of the anterior portion 

 of the strobila, those with more or less elongate scolex, bothria shallow 

 posteriorly, first segments slender, and usually as long as or longer 

 than broad were referred to scorpii. Those with scolex variously 

 contracted, usually short and broad, bothria extending to base of 

 scolex, and first segments crowded together and much broader than 

 long were referred to clamceps. 



Specimens jrom Anguilla rostrata. — Collected on three dates in 

 July and one in November, 1 to 9 strobilae on each date. I^laximum 

 length in alcohol 175 mm., maximum breadth 2 mm. (U.S.N.M. 

 No. 8862). 



