XXXVi1 CONTENTS OF VOL. IT. 
Page. 
Tribe II. Lips unfit to act as a sucker. Squalus. 
Raia. Chimera. 375 
Subdivision II. Branchiz free. 
Accipenser. Spatularia. 380 
Order I].—Osseous Fishes. 
Subdivision I. Jaws imperfect. 
Tribe I. Jaws exposed and covered with ivory. Dio- 
don. : , , : 381 
Tribe II, Jaws covered, and supporting ordinary 
teeth. Balistes. Ostracion. 382 
Subdivision II. Jaws perfect. 
Tribe J. Gills in tufts. Syngnathus. 383 
Tribe II. Gills continuous. 
A. Malacopterygious Fishes. 
(I.) Ventral fins abdominal. Salmo. Clupea. Esox. 
Cyprinus. Silurus. : ; 384 
(II.) Ventral fins thoracic or jugular. 
a. Sides similar. 
(aa.) With a sucker. Cyclopterus. Echeneis. 387 
(BB.) Destitute of a sucker. Gadus. 388 
b. Sides dissimilar. Pleuronectes. ib. 
(III.) Ventral fins wanting. 
aa. Gill opening small. Murena. Gymnotus, 389 
bb. Gill opening apparent. Ophidium. Ammodytes. 
x. Acanthopterygious Fishes. 
I. Tzenioide. Cepola. Gymnetrus. Trichiurus. 
Lepidopus. ; 
390: 
