CESTODES FROM FISHES — LINTON 



439 



Family AMPHICOTYLIDAE Ariola 

 Genus ABOTHRIUM van Beneden 



ABOTHRIUM RUGOSUM (Batsch) 



Plate 62, Figure 19 



Taenia rugosa Batsch, Naturgeschichte der Bandwurmgattung uberliaupt und 

 ihrer Arten insbesondere . . ., p. 208, 1786. _ 



Dibothrium rugosum (Batsch) Diesing, Systema helmmthum, p. 591 1850- 

 LiNTON, Rep. U. S. Fish Comm. for 1887, PP- 750-754 P^- 3' ^gs^ 7-\0' 

 1890; Froc. U. S. Nat. Mus., vol. 20, p. 431, pi. 28, figs. 1-4, im-BulLV 

 S. Fish Comm., vol. 19, p. 476, 1901; Bull. U. S. Bur. Fish., vol. 31, p. 586, 



For extended synonymy and account of this species see Cooper, Illinois Biol. 

 Mon., vol. 4, pp. 460-473, 9 figs., 1919. 

 The adult strobila of this cestode is usually found \vith the anterior 

 end impacted m the pyloric caeca, where it is surrounded by waxy 



degenerate tissue. 



Svecimens from Gadus morrhua.-Concerning the distribution by 

 months in the following summary it should be remarked that, with 

 the exception of the two dates m June, aU the fish had been kept for 

 some time in a live-car. On one of the June dates the fish was taken 

 off Nantucket, the other 20 miles east of Great Romid Shoal. All 

 collections, except those of July, were made by Vinal N. Edwards m 

 the years from 1903 to 1916, and on four dates in earlier years refer- 

 ence to which was not included in previous publications. 



^peamens/rom Melanogrammus aeglefinus.-Thirty-eight haddock 

 were examined on 14 dates in six different years. Examinations were 

 made in every month except January, February, and March. A. 

 ruqosum was found as follows: 



April- 1 fish examined; 1 strobila, length 250 mm, breadth 4 mm 



August: 16 fishes examined on one date; 2 strobilae, length 60 and 

 36 mm, breadth 2 and 3.5 mm. ,, loo 



October- (1) 1 fish examined; 8 strobilae, maxunum length 12^ mm. 

 (2) 4 fishes examined on one date; 6 strobilae and fragments aggregat- 

 ing 1,358 mm, maximum length 210 mm. 



