ACTINOPTERI. 



171 



at their bases alveolar borders notched. Length of fragment 20 

 mm. (From Cope.) 



Formation and locality. Known only from the above, obtained 



Fig. 104. — Dictyodus silovianus (Cope). (Type, xi^, from Hussakof.) 



in the Miocene of Cumberland County and now in the American 

 Museum at New York. Not seen by me. 



Dictyodus speciosus (Leidy). 



Sphyrtzna speciosus Leidy, Proc. Acad. Nat. Sci. Phila., 1856, p. 221. Mio- 

 cene Marl of Cumberland Co., N. J. (E. Davis.) 



Sphyranodus speciosus Cope, Proc. Amer. Philos. Soc. Phila., XIV, 1875, 

 p. 362. (Miocene of Cumberland Co., N. J.) 



Detached teeth compressed, without roots, inner side much 

 less convex than outer, so that transverse section would be un- 

 evenly elliptical, and cutting-edge on each side extending com- 

 pletely from base to apex, and also minutely serrated. Enameled 



16 17 18 

 Fig. 105. — Dictyodus speciosus (Leidy): 1-9, Monmouth Co. (Knieskern) ; 

 10-15, Vincentown (Bryan); 16-18, Charles Co., Md. (Thomas). 



surface smooth, without striae. Anterior tooth shows only single 

 cutting-edge, and though well compressed opposite edge well 

 convex and forming slight apical barb. Basally and around 

 convex edge many minute vertical striae. Length of largest ex- 

 ample 10 mm. 



