PLATE IX. 
Pig. Page 
1. Caturus heterurus (Agassiz); anterior half of fish, left 
lateral aspect, one-half nat. size.—Lower Lias: Lyme 
Regis, hr. Branchiostegal rays. d. Dentary. g. Gular 
plate, mx. Maxilla. op. Operculum, p.o. Suborbital 
(postorbital), p.op. Preoperculum, p.t. Post-temporal. 
pmx. Premaxilla. s.mx. Supramaxilla. s.op. Sub¬ 
operculum. [38121.] 340 
2. Ditto; upper caudal lobe, left lateral aspect.-—Ibid. 
/. Eulcral ridge-scales, r. Caudal fin-rays. s. Rhombic 
scales. [P. 2036.] 341 
3. Ditto ; pelvic fin-support.—Ibid. [P. 2036.] 341 
4. Ditto ; caudal flank-scales, twice nat. size.—Ibid. 
[P. 2036.] 
341 
