FELIS LYNX. 175 
b and ec, are increased in size, and the former defined from the primary, a, by a cleft; and 
from the cingulum by a notch; a also is more trenchant and broader in the antero- 
posterior direction. 
The sectorial molar presents absolutely no points of difference when compared with 
that of F. borealis and F. cervaria, but, as before mentioned, it is differentiated from that 
of the Canadian Lynx by the presence of the small accessory cusp, ¢, which is adherent to 
the posterior base of the posterior blade, a. In the latter animal, moreover, the anterior 
blade, 4, is shorter as compared with the posterior, a. 
§ 4. Measurements. In the following tables we have arranged the measurements, in 
inches and tenths, of the skulls and lower jaws most closely allied to our fossil. The dif- 
ferences in size and proportions can be seen at a glance. In the last column of the 
measurements of the lower jaw we have inserted those of the teeth, from a jaw marked 
and found by Senhor Delgado! in the Casa da Moura, a cave in the Jurassic Limestone of 
Cesareda, in Portugal, that had been inhabited by a tribe of cannibals, probably of the 
Bronze Age. They agree exactly with those of our fossil, and therefore, although the jaw 
to which they belong is smaller in every dimension than the fossil from Derbyshire, both 
probably belong to the same species. The difference of size is not greater than that existing 
between two skulls of Norwegian Lynxes in the British Museum. 
| F.lyne | F.lyne | F.lyne | F. Lyne 
, lynx, | (6 is), | (cervaria),| (cervaria),| (Canada), 
| MEASUREMENTS OF SKULL. ae eased | Saat) ab oe Sor 
1230 A. | 1156 A. 4587. Museum. 
| Maximum herphiret @beipat sca cee.| ASE 1°6 1°62 1°45 1°35 
Pn occipital foramen.................. "86 65 68 6 *55 
i es CAAECUBITAIS oh o2) cite cous. +.-0) 1:05 Bake oo 85 8 
Gransverse extent of occiput... ........ 2.0. ..6.06 0s ee ees 2°02 2-0 2:0 aN 2°2 
Transverse measurement of occipital foramen ......... 79 A 66 65 6 
Antero-posterior extent of condyles ..................... °O7 "55 O7 DO Nee soo 
3 5 basi-occipital ............... 1:05 1:08 1-02 POs) C85 
Fes ee zygomatic articulation ... *42 “4 sD | 3) “28 
Transverse A y a fy 98 1:0 ‘78 78 9 
Meatus auditorius to meatus auditorius ............... 2°0 1:99 2°0 1°89 16 
Glenoid articulation to glenoid articulation........ sscgll lke: 1°82 1°86 1-62 16 
MUEET UN TMP AMLGIADECE cia cece aaa can cceescse eee cee eee cee “85 “7. 64 "46 "52 
Antero-posterior extent of tympanic bulla ............ "92 95 “96 105 |  *95 
' Encroachment of sur-occipital on parietal surface ... *35 ‘37 || se a20 “2 | 
’ Commissiio Geologica de Portugal. Estudos Geologicos. Da Existencia do Homem no nosso solo 
em Tempos mui remotos provado pelo estudos das cavernas. Primeiro opusculo. Noticia acerca das 
Grutas da Cesarada. Par J. F. W. Delgado. Com a versao em Francez, par M. Dalhunty. This jaw is 
alluded to in the text as belonging to species a, and is figured in pl. ii, fig. 1. See also Bone Caves in Portugal, 
‘Quart. Geol. Journ.,’ No. 94, Translations and Notices, p. 9. 
