[cooper] 



TREMATODES FROM MARINE FISHES 



193 



to conclude that they are of little use in the distinction of species, — 

 at least as applied to the material at hand. 



Very young and immature Azygia were also found in Perca 

 flavescens (Mitchill) ; they probably belong to this species. 

 20. Azygia acuminata Goldberger. 4, pp. 17-22. 



Stomach of Amia calva L., "Dog-fish", Bowfin. 



Nine specimens from two individuals of the host species are re- 

 ferred to this species, since, presenting no evidence of undue con- 

 traction, they agree in essentials with Goldberger's description. The 

 testes are situated close together towards the posterior end of the body, 

 the anterior being smaller than the posterior and in four specimens to 

 the left of the median line, in four to the right, and in one (the smallest, 

 6mm. of the table below) in the median line. The ovary, immediately 

 in front of the anterior testis, is smaller than it and also in the median 

 line (Fig. 17). The vitellaria begin in all specimens at about the same 

 level, a short distance behind the acetabulum, but vary in extent 

 posteriorly and on the different sides. In two the right is longer than 

 the left, in two they are at about the same level, while in the remainder 

 the left extends farther than the right. The oral sucker is relatively 

 larger than that described for this species, and the pharynx is spherical 

 with a larger cavity than in A. lucii. The following table gives the 

 measurements of four examples, the first two being all that were 

 taken from one host: 



21. Crepidostomum cornutum (Osborn). 20. 



Stomach of M. dolomieu from Go-Home Bay, Flat-Rock Lake 

 and Musquash River; stomach and pyloric coeca of Ambloplites rupes- 

 tris; and intestine of Ameiurns lacustris (Walb.), Channel Cat, from 

 Flat-Rock Lake and Musquash River. 



The largest specimen at hand from the Black Bass gives the fol- 

 lowing measurements: Length, 3-70; breadth, at middle, 0-46; 



