GYllNODONTID^. 
573 
based on inner dental plates in Geological Museum, University of 
IS’aples. 
Form, Loc. Miocene : Italy, Sicily, and Malta. 
Fig. 20. 
Fiodon scill<s ; inner dental plates, 
inner aspect, nat. size. 
P. 3874. The type specimen labelled by Agassiz, being the inner 
dental plates, shown of the natural size, from the inner 
aspect, in fig. 20 ; Malta. FnnisJciUen Coll. 
P. 3874 a. Two more imperfect specimens, one being only half the 
pile of plates ; Malta. Enniskillen Coll. 
36815. Fragments of larger dental plates, doubtfully of this species ; 
Isle of Gozo. Presented hy Dr. A. Leith Adams, 1862, 
Diodon sigma, Martin. Ty ^ 
1883. Diodon sigma, K. Martin, Samml, Geol. Eeichsmus. Leiden [1] 
Tol. iii. p. 16, pi. i. fig. 5. 
1891. Diodon sigma, Rothpletz & Simonelli, Zeitschr. deutsch. geoL 
* Ges. vol. xhi. p. 726, pi. xxxvi. fig. 1. 
Type. Inner dental plates ; Leyden Museum. 
Inner dental plates much like those of D. scilloe, but inner face of 
pile apparently less flattened, more rounded from side to side. 
Form. Loc. Miocene : Java; Canary Islands. 
P. 9476. Well-preserved dental pile and a fragment; Las Palmas, 
Grand Canary. Presented hy Sir Charles Lyell, Bart. 
Diodon vetus, Leidy. 
1855. Diodon veins, J. Leidy, Proc. Acad. Nat. Sci. Philad. vol. vii. 
p. 397. 
1875. Diodon antiquus, E. D. Cope, in W. C. Kerr, Rep. Geol. Surv. 
N. Carolina, vol. i. Append, p. 31. 
1877. Diodon vetus, J. Leidy, Journ. Acad. Nat. Sci. Philad. [2] vol. viii. 
p. 255, pi. xxxiv. figs. 15-18. 
Type. Imperfect jaw ; National Museum, AVashington. 
