889 
No. 431.] MORTH-AMERICAN INVERTEBRATES. 
Subfamily XVI. Gorgoderinz Lss. 
Genera: Phyllodistomum, Gorgodera. 
Subfamily XVII. Microphallinze Ward. 
Genera: Microphallus, Levinsenella. 
Subfamily XVIII. Brachyceeliine Lss. 
Genera: Phaneropsolus, Lecithodendrium, Pycnoporus, Brachyccelium. 
Related genera: Cymatocarpus, Brandesia. 
Subfamily XIX. Pleurogenetina Lss. 
Genera: Prosotocus, Pleurogenes, Gymnophallus, Lepidophyllum. 
Subfamily XX. Cephalogoniminz Lss. 
Genera: Cephalogonimus, Emoleptalea, Prosthogonimus. 
Related genus: Stromylotrema. 
Subfamily XXI. Dicroceeliine Lss. 
Genera: Dicroceelium, Lyperosomum, Athesmia. 
Related genera: Eumegacetes, Anchitrema. 
Subfamily XXII. Hemiurinz Lss. 
Genera: Hemiurus, Lecithocladium, Pronopyge, Lecithochirium, Lecithas- 
ter, Liopyge, Derogenes. 
Subfamily XXIII. Syncceliine Lss. 
Genera : Progonus, Synceelium, Otiotrema. 
Related genus: Halipegus, Accaccelium, Eurycoelum. 
 Subfamily XXIV. Harmostominz Lss. 
Genera: Harmostomum, Ityogonimus, Glaphyrostomium, Scaphiostomum. 
Subfamily XXV. Urogoniminz Lss. 
Genera: Urorygma, Urogonimus, Urotocus, Urotrema. 
Subfamily XXVI. Zoógoninz Odh. 
Genera: Zoógonus, Zoógonoides. 
Subfamily XXVII. Clinostomine Pratt. 
Genera: Clinostomum, Nephrocephalus. 
Additional genera: Sperostoma, Microlistrum, Mesotretes, Hapalometra, 
istomum. 
Family III. Schistosomidae Lss. 
Genera : Schistosoma, Bilharziella, Keellikeria. 
Family IV. Holostomide Brds. 
Subfamily I. Cyathocotylinz Pratt. 
Genus: Cyathocotyle. 
