350 
SELACHII. 
1876. Sphenndm lonyidens, E. Fiivre, Fos.s. Terr. O.xford. Alpes Tribourg. 
(M(5m. Soc. Pal. Suisse, vol. iii.), pi. ii. fig. 2. 
Type. Detached dental crowns ; Munich Museum (in part). 
The typo species, of moderate size. Dental crown narrow, at- 
taining a maximum height of about 0'03, and scarcely sigmoidally 
curved ; inner coronal face gently convex, outer face flat or slightly 
convex ; cutting-edges very iwomincnt. 
0. maeer was only distinguished by Quenstedt on account of its 
occurring at a somewhat higher horizon than the typical teeth. 
Form, (f" hoc. Oxfordian : Bavaria and Wiirtembcrg. Corallian : 
Wiirtcmborg and Hanover. Upper Jurassic: Government of Mos- 
cow, Russia. 
P. 1254-5. Typical dental crown, and small example ; Oxfordian, 
Rabenstein, Bavaria. Eyerton Coll. 
P. 5753. Three small dental crowns; Rabenstein. Emiiskillen Coll. 
P. 1256. Small dental crown ; Oxfordian, Streitberg, Franconia. 
Eyerton Coll. 
22489, 22503, 22658. Eight dental crowns ; Corallian, Schnaitheim, 
Wiirtemberg. Purchased, 1848. 
P. 2370. Dental crown ; Schnaitheim. Enniskillen Coll. 
The following species are also distinguished, but there are no 
examples in the Collection : — 
Orihacodus impressus, K. A. von Zittel, Fauna Aelt. Ccphalopo- 
dcnfiihr, Tithonbild. (Suppl. to Palajontogr., 1870), p. 25, 
pi. i. figs. 3, 4 (Sphenodus). — Tithonian ; Southern Alps. 
Orthacodus nitidns. A, Wagner, Abh. konigl. bay. Akad. Wiss., 
math.-phy.s. Cl. vol. ix. (1863), p. 290, pi. iv. fig- 4 
{Sphenodus). — Lithographic Stone ; Bavaria. 
Orthacodus titlionius, G. G. Gemmellaro, Studi Paleont. Fauna 
Calc, a Terehratula janitor N. Sicilia, pt. i. (1868—76), 
p. 8, pi. ii. figs. 32-41 {Sphenodus). — Upper Jurassic; 
Sicily. 
Orthacodus viryai, G. G. Gemmellaro, op. cit. pt. i. p. 8, pi. u- 
figs. 42-47 {Sphenodus). — Upper Jurassic; Sicily. 
To this genus also Quenstedt (Handb. Petrefakt. 3rd edit. 1882, 
p. 271) refers the Liassic tooth named Lamna liassica, U. Schou- 
bach (Neues Jahrb. 1863, p. 166). 
