SYNOPSES OF NORTH-AMERICAN 
INVERTEBRATES. 
XII. THE TREMATODES. 
PART I[1— THE ASPIDOCOTYLEA AND THE MALA- 
COCOTYLEA, OR DIGENETIC FORMS. 
H. S ERATI. 
Tne following are the families, subfamilies, and genera of the 
suborders Aspidocotylea and Malacocotylea, as arranged by 
Braun, Fischoeder, Looss, Liihe, Monticelli, Stiles and Hassall, 
and others : 
Order. — Trematoda Rud. 
Suborder II. Aspidocotylea Mont. 
Family. Aspidobothride Burm. 
Genera: Macraspis, Stichocotyle, Aspidocotylus, Platyaspis, Cotylaspis, 
Cotylogaster, Aspidogaster, Lophotaspis. 
Suborder III. Malacocotylea Mont. 
Family I. Paramphistomidz Fisch. 
Subfamily I. Paramphistominz Fisch. 
Genera: Gastrothylax, Paramphistomum, Stephanopharynx. 
Subfamily II. Cladorchinz Fisch. 
Genera: Gastrodiscus, Homologaster, Diplodiscus, Cladorchis, Chiorchis. 
Related genus: Balanorchis. 
Family II. Fasciolida Rail. 
Subfamily I. Fascioline S. et H. 
Genera : Fasciola, Fasciolopsis, Campula. 
Related genera: Pleorchis, Paragonimus. 
Subfamily II. Omphalometrinz Lss. 
Genera: Omphalometra, Cathzemasia. 
l Part I appeared in the American Naturalist, vol. xxxiv (August, 1900), 
P- 645. The figures illustrating Part II will appear in the continuation, in the 
‘December number of the American Naturalist. 
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