GYMNODONTIDiE. 
573 
based on inner dental plates in Geological Museum, University of 
Naples. 
Form, <J- Loc. Miocene : Italy, Sicily, and Malta. 
Fig. 20. 
Diodon scilla ; inner dental plates, 
inner aspect, nat. size. 
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. Enniskillen Coll. 
F. 3874 a. Two moro 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 by Dr. A. Leith Adams, 1862. 
Diodon sigma, Martin. 
1883. Diodon sigma, Iv. Martin, Samml. Geol. Reichsmus. Leiden [1] 
vol. iii. p. I6 j pi. i. fig. 5. 
1891. Diodon sigma, Rothpletz & Simonelli, Zeitschr. deutsch. geol. 
Ges. vol. xiii. p. 726, pi. xxxvi. fig. 1. 
Type. Inner dental plates ; Leyden Museum. 
Inner dental plates much like those of D. scillce, hut inner face of 
Pile apparently less flattened, more rounded from side to side. 
Form. Loc. Miocene : Java ; Canary Islands. 
F- 9476. Well-preserved dental pile and a fragment; Las Palmas, 
Grand Canary. Presented by Sir Charles Lyell, Bart , 
Diodon vetus, Leidy. 
1855. Diodon vetus, 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, Washington. 
