PLATE Y. 
Fig. Page 
1. Eugnathus orthostomus , Agassiz (type specimen of so-called 
E. scabriusculus, Agassiz, MS.); lower portion of head, 
right lateral aspect.—Lower Lias ; Lyme Regis, ag. 
Angular, br. Branchiostegal rays. d. Dentarv. g. Gular 
plate, i.op . Interoperculum, mx. Maxilla, p.op. Pre¬ 
operculum. s.o. Suborbital, s.op. Suboperculum. 
[P. 509.] 293 
2. Eugnathus philpotce , Agassiz; right opercular apparatus 
and clavicle, outer aspect.—Ibid. cl. Clavicle, op. Oper¬ 
culum. x. Fracture across clavicle. Other letters as 
above. [38104.] 295 
3. Eugnathus minor , Agassiz; head and opercular apparatus, 
left lateral and superior aspect.—Ibid. c.o. Circum- 
orbitals. fr. Frontal, pa. Parietal, p.t. Post-tem¬ 
poral. s.mx. Supramaxilla, s.t. Supratemporal. sq. 
Squamosal. Other letters as above. [P. 3628.] 298 
