[cooper] TREMATODES FROM MARINE FISHES 191 



16. Ancyrocephalus cruciatus (Wedl). 27, pp. 22-24. 



On the gills of young M. dolomieii. 



The largest example, very much contracted longitudinally and 

 curved ventrally, measured 0-48 X 0-24mm. As indicated in Fig. 

 12 (of a specimen, 0-50 X 0- 13) B, no more than six pairs of peripheral 

 hooks were recognized in the posterior disc. Furthermore the chitinous 

 clamp connecting the ventrally directed or more anterior pair of 

 central hooks is not exactly similar to that shown in Wegener's Fig. 5 

 (loc. cit., p. 24), but seems to be made up of two pairs of pieces. The 

 posterior disc is in all specimens distinctly excavated on its ventral 

 surface. 



17. Diplostomum cuticola (v. Nordm.). 11, p. 513. 



Encysted on the mesenteries and in the kidneys of Notropis 

 atherinoides (Raf.), Minnow, in the coelome of N. cornutus (Mitchill), 

 Red-fin Minnow, and in the liver oî Eupomotis gibbosus (L.), Sun-fish, 

 at Go-Home; and on the mesenteries of Semotilus atromaculatus 

 (Mitchill), Creek Chub, at Toronto. 



The largest cyst was from the latter host and measured 

 1-70 X 1 • 14mm. It contained, as did many of this lot, two worms, 

 0-93 and 0-43 in length. 



Records are also at hand of diplostoma encysted in the livers of 

 young M. dolomieu, on the mesenteries of Boleosoma nigrum (Raf.), 

 Johnny Darter, on the viscera and mesenteries of Percina caprodes 

 (Raf.), Log Perch, and in the liver of young Amploblites rupestris 

 (Raf.), Rock Bass. All of them belong to this species, in all pro- 

 bability. Not a few of the larger cysts were found to contain two 

 worms, one usually much smaller than the other. 



18. Diplostomum volvens v. Nordm. 3, p. 317. 



In the lenses of the eyes of young M. dolomieu. 



A typical example, so contracted as to show the anterior append- 

 ages and the short conical posterior portion in what was considered, 

 by reference to numerous figures at hand, to be the normal position 

 at rest, has a length of 0- 31 with maximum breadth of 0- 20mm. 



19. Azygia lucii (Mueller) = Azygia tereticollis (Rud.). 18, pp. 



519-20; 4, pp. 16-17. 



Stomach of Lucius lucius (L.), Pike, L. masqidnongy (Mitch.), 

 Maskinonge, Salvelinus namaycush (Walbaum), Salmon Trout, 

 Lucioperca sp ?, Pickerel, M. dolomieu Lac. 



