Cretaceous Selachians 
79 
SYSTEMATICS 
Full synonymies for the species cited will be found in Cappetta and 
Case (1975b) and Case (1978). The illustrated voucher specimens are 
housed in the Museum of Natural History, Princeton University (PU); 
additional specimens are in the author’s collection. 
Class CHONDRICHTHYES 
Subclass ELASMOBRANCHII 
Clade HYBODONTIFORMES 
Order SELACHII 
Hybodus Agassiz, 1837 
Hybodus sp. 1 
Hybodus sp. 1 - Cappetta and Case, 1975:5, Fig. 2. 
Material : — PU 22418, one lower lateral tooth lacking roots (Figs. 1-2). 
Site 1. 
Description : — An isolated central cusp showing little wear on the blade; 
the root is missing as it is in most specimens. Plications on either side of 
the blade, rising from the apron above the root separation to approx- 
imately 1/5 the total height of the blade; plications more pronounced on 
the labial face. The tooth faces inward and is slightly concave in lingual 
aspect. It resembles a similarly preserved specimen from the Navesink 
Formation (Middle Maestrichtian) of New Jersey (Cappetta and Case 
1975b, Fig. 2), differing only in having a slight lateral apron. 
Discussion : — Cappetta and Case described Hybodus sp. 1 on the basis of 
incomplete cusps, with or without lateral cusplet traces. More recently 
Case (1978) described as Hybodus montanensis a tooth from the Judith River 
Formation (Campanian) of Montana, which shows strong, quite deep 
plications occupying approximately 1/3 of the tooth cusps. This species 
from the Western Interior is quite different from Hybodus sp. 1. The latter 
will be named by Case on the basis of an almost complete specimen show- 
ing a partial root and two lateral cusplets on one side, found in central 
New Jersey in 1978. 
Suborder ANACORACOIDEI 
Family ANACORACIDAE 
Squalicorax Whitley, 1939 
Squalicorax kaupi (Agassiz) 
Corax kaupi Agassiz, 1843:225, PI. 26a, Figs. 25-34; PI. 26, Figs. 4-8. 
Material'. — PU 22419A, an upper antero-lateral tooth (Figs. 3-4), and 
PU 22419B, a lower lateral tooth (Figs. 5-6); numerous additional teeth, 
