42 WOODWARD : FOSSIL FISHES OF THE UPPER LIAS OF WHITBY. 
Figs. Plate V. Page. 
1. Ptycholepis hollensis, Agassiz ; imperfect fish, left lateral 
aspect. position of anal fin; c, caudal fin; c/., 
clavicle; d., dorsal fin ; md., mandible; mcc., maxilla; 
op., operculum; orh., orbit; pet., pectoral fin; ph., 
pelvic fin ; 5.ojt?., suboperculum. [P. 858] . ... 38 
\a. Outline of five flank-scales of same specimen, twice natural 
size, showing arrangement of ornamental grooves ... 39 
ih. Scales at base of lower caudal lobe of same specimen, twice 
natural size ... ... ... ... 39 
2. Ptycholepis bollensis, Agassiz ; head and anterior scales, left 
lateral aspect, gu., remains of 
gular plate ; other letters as 
above. [P.858 a] ... 39 
3. ,, „ ventral aspect of fish, wanting 
end of caudal region, h. , small 
scales at base of pectoral fin ; 
ch, ceratohyal ; pet., pectoral 
fins ; ph., pelvic fin ; p.x., en- 
larged scales between pelvic 
fins ; X., enlarged scales be- 
tween pectoral fins. [P. 5222] 39 
4. „ ), right mandibular ramus, outer 
aspect. [P. 3691a] 
Note. — All the specimens represented on these plates are preserved in 
the British Museum, and the numbers in square brackets refer to the Register 
of the Department of Geology. Unless otherwise stated, the figures are of 
the natural size. 
