CESTODES FROM FISHES — LINTON 429 



Scolex length 1.54 mm., breadth 0.25 mm.; first segments, average of 

 five, length 0.41 mm., breadth of fifth segment 0.22 mm.; another 

 scolex, length 1.65 mm., anterior breadth 0.19 mm., middle 0.3 mm,, 

 base 0.018 mm. 



Specimens Jrom Urophycis chuss. — Recorded from this fish under 

 the name Dibothrium punctatum (Rudolphi) by me " and by Cooper.'^ 

 A large number of hakes were examined by Edwards through a long 

 series of years, Cestodes here noted were collected on 26 dates in nine 

 different years: 14 on seven dates in May, 81 fishes examined; 1 on one 

 date in June, 10 fishes examined; 5 on three dates in August, 14 fishes 

 examined; 23 on seven dates in October, 44 fishes examined; 11 on 

 eight dates in November, 195 fishes examined. The largest number 

 recorded from one fish is eight. Largest strobila, length 108 mm., 

 breadth 2 mm. In most cases the strobilae were immatm-e. In one 

 specimen, collected October 3, 1915, mounted in balsam, length 32 

 mm., breadth 1.6 mm., there are segments with ova, 0.06 by 0.03 mm. 

 Measiu-ements in balsam: Scolex length 1.33 mm., breadth, marginal 

 view, 0,28 mm,; first segment length 0,28 mm,, anterior breadth 0,15 

 mm,, posterior 0,19 mm, (U,S.N.M, No. 8876). 



Specimens from Zygonectes diaphanus. — Two collected August 22, 

 1916, lengths 6 and 12 mm. Measurements in balsam: Scolex 

 length 0.7 mm., breadth 0.22 mm., anterior disk 0.21 mm.; first seg- 

 ment length 0.15 mm,, anterior breadth 0,14 mm., posterior 0.18 mm.; 

 posterior segments, average length of eight, 0.42 mm., breadth 1 mm.; 

 ova 0.048 to 0.057 by 0,03 to 0,036 mm, (U,S.N,M, No. 8877). 



BOTHRIOCEPHALUS CLAMCEPS (Goeze) 



Plate 61, Figures 11-13 



For full account of this species, including synonymy, see Cooper, Illinois Biol. 

 Mon., vol, 4, pp. 402-410, 1919, 



To this species are referred cestodes of the genus that are character- 

 ized by having the first segments usually crowded and much broader 

 than long, with the scolex assimiing a variety of shapes from elongate 

 to nearly spherical, the botlu'ial pits extending to the base of the scolex. 

 The ova are thin-shelled and often collapsed and show but faintly 

 tlirough the body wall, in contrast with B. scorpii, in which the shells 

 of the ova are thicker, the masses of ova showing as dark-brown blotches 

 in strobilae with ripe segments. 



Specimens from Acanthocottus aeneus, — Recorded by me ^^ from 

 this fish under the name Dibothrium punctatum (Rudolphi), 



A large number of sculpins were examined for Entozoa over a long 

 series of years, Cestodes of this species were found on 20 dates in 



'3 Bull. U. S. Bur. Fish., vol. 31, p. 586, 1911. 



'< Illinois Biol. Mon., vol. 4, p. 388, 1919. 



" Bull. U. S. Bur. Fish., vol. 31, p. 586, 1911, 



