440 PROCEEDINGS OF THE NATIONAL MUSEUM vol.90 



The anterior ends of the strobilae are imperfect on account of their 

 permanent fixation in the pyloric caeca (U.S.N.M. No. 8901). 



Specimens from Microgadus tomcod. — Tomcod were examined for 

 Entozoa by Edwards in nearly every month and over a long series of 

 years. Cestodes that appear to belong to this species were found 

 twice: 



January 1, 1904: 30 fish examined; 1 strobila, length 50 mm. 



April 26, 1910: 1 fish examined; fragments of strobilae. 



Specimens from PoUachius virens. — Three fragments belonging to 

 two strobilae were collected May 28, 1913; lengths 25, 145, and 242 

 mm., thickish; segment of maximum breadth, in balsam, length 0.84 

 mm., breadth 3.7 mm. ; ova in sections, about 0.044 by 0.033 (U.S.N.M. 

 No. 8902). 



Specimens from Urophycis tenuis. — Collected as follows: 



December 15, 1904: 1 strobila, length 140 mm, breadth 4 mm; 

 scolex missing. 



November 5, 1910: 1 strobila, length 23 mm.; no scolex. 



August 4, 1911: 1 strobila, with scolex and numerous fragments. 



May 7, 1913: 2 strobilae, lengths 10 and 14 mm. 



Family PROTEOCEPHALIDAE LaRue 

 Genus PROTEOCEPHALUS Weinland 



PROTEOCEPHALUS MACROCEPHALUS (Creplin) 



Plate 62, Figures 24-28 



Taenia dilatata Linton, Rep. U. S. Fish Comm. for 1886, p. 488, 1889; Proc. 



U. S. Nat. Mus., vol. 20, p. 429, 1897; Bull. U. S. Fish Coram., vol. 18, 



p. 435, 1901. 

 For full synonymy and description see La Rue, Illinois Biol. Mon., vol. 1, 



pp. 129-143, 1914. 



Specimens from Anguilla rostrata. — My notes show that 106 eels 

 were examined for parasites on one date in January, two in March, 

 six in April, three in May, one in July, two in August, four in Septem- 

 ber, three in October, and nine in November in 12 different years 

 from 1903 to 1924, inclusive. Taenia referred to this species were 

 found on two dates in April, nine eels examined, one strobila and 

 fragments, longest 4 mm.; on one date in June, six eels examined, 

 one strobila, length 350 mm., breadth 2 mm.; on one date in July, 9 

 eels examined, 10 strobilae and fragments, longest 140 mm.; on one 

 date in August, two eels examined, one strobila and fragments, 

 longest 90 mm.; on four dates in November, 43 eels examined, six 

 strobilae and fragments, longest 295 mm., maximum breadth 2 mm. 



Diameter of scolex in balsam, average of 10, 0.24 mm., minimum 

 0.35 mm.; ripe proglottids in different strobilae, lengths 1.47 and 1.96 

 mm., breadths 1.33 and 1.12 mm. (U.S.N.M. No. 8906). 



