CONTENTS. CI 



APPENDIX F— Continued. 



XXV. The Crustacea of fresh waters of the United States — Continued. 



B. The crustacean parasites of the fresh- water fishes of the United States.. 661 



Family Argulidse 662 



Family Caligidse 662 



Family Lernseopodidis 662 



Family Lernaeoceridse 665 



XXVI. Synopsis of the North American fresh-water leeches. By 



A. E. Verrill 666 



Genus Macrobdella 667 



Genus Aulastomum 670 



Genus Democedes 671 



Genus Semiscolex 671 



Genus Hexabdella 672 



Genus Nephelopsis 673 



Genus Nephelis 675 



Genus Clepsine 677 



Genus Cystobranchus 685 



Genus Ichthy obdella 686 



Genus Astacobdella 688 



Genus Liostomum 688 



Genus Hirudo 688 



Genus Oxyptychus 689 



Genus Centropygus 689 



XXVII. Sketch of the invertebrate fauna of Lake Superior. By 

 Sidney I. Smith 690 



Account of field work and material obtained 690 



Articulata 693 



Insects 693 



Diptera 693 



Neuroptera 693 



Acarina 694 



Crustacea 694 



Podophthalmia 694 



Tetradecapoda 694 



Amphipoda 694 



Isopoda 695 



Entomastraca 695 



Cladocera 695 



Ostracoda 696 



Copepoda 697 



Siphonostoma 697 



Worms 697 



Oligochaita 697 



Bdellodea 699 



TurbeUaria 700 



Mollusca 700 



Gastropoda 700 



Lamellibranchiata 703 



Radiata 705 



Bathymetrical distribution of species 706 



XXVIII. Food OF fresh-water fishes. By Sidney I. Smith 708 



