176 



PLATHELMINTHES 



P. coronatum Leidy. Body lanceolate, 6 mm. long, with 3 pairs of 

 minute hooks between the anterior pair of suckers, and 1 large and 2 

 small pairs between the posterior pair: in the 

 nose of the food terrapin. 



P. hassalli Goto (Fig. 283). Body ovate; 1.5 

 mm. long and 1 mm. wide; disc hexagonal with 

 3 pairs of small hooks between the anterior pair 

 and 1 pair of large hooks between the posterior 

 pair of suckers; intestine without side branches: 

 in the urinary bladder of Kino- 

 sternum pennsylvanicum. 



2. SPHYEANTJEA Wright 

 and MacCallum. Body elon- 

 gate with a small posterior 

 disc containing 2 large suck- 

 ers: 2 species. 



S. osleri Wr. and MacC. 



(Fig. 284). Body tapering at both ends, 4 mm. long 

 and .6 mm. wide; disc wider than body; testes nu- 

 merous: on skin and gills of Necturus maculatus. 



SUBFAMILY 2. OCTOCOTYLINAE. 



Posterior region with 8 (4) large suckers; paired 

 anterior suckers present: about 12 genera. 



Key to the genera of Octocotylinae here described : 



-7 



Fig. 283 Polystoma 

 hassalli (Goto). 



References 

 as in Fig. 278. 



dj Posterior disc-like region with median 



hooks 1. DISCOCOTYLE 



o 2 Median hooks not present. 



2. DlCLIDOPHOEA 



Fig. 284 



mura oslen 



(Wright and 



MacCallum). 



References 



as in Fig. 278. 



1. DISCOCOTYLE Diesing. Body 

 elongate with small hooks in the poste- 

 rior disc; posterior suckers slightly stalked and with 

 strong chitinous support; vagina Y-shaped: several 

 species. 



D. salmonis Shaffer (Fig. 285). Body lanceolate; pos- 

 terior suckers slightly raised and with 1 pair of hooks; 

 5 mm. long : on the gills of the rainbow trout. 



2. DICLIDOPHORA Goto. Body elongate; posterior 

 suckers either stalked or not and acting as pincers; each 



sucker with a chitinous frame work in form of a Greek cross: on the 

 gills of the Sparidae and other marine fishes. 



Fig. 285 



Discocotyle 



salmonis 



(Shaffer). 



References 



as in Fig. 278. 



