68 PLEISTOCENE MAMMALIA. 



Hyaena-den. This has the point and the inner side a little abraded by the wear of the 

 lower canine. We figure a second specimen (PI. XI, fig. 5) found in Ravenscliff Cave, 

 Gower, by Colonel Wood, to whose courtesy we are much indebted for the loan of this 

 specimen, as well as of the incisors 1 and 2, for the purposes of this work. This 

 specimen is smaller than the last, and may be considered as a good example of the 

 average size from the large form of the animal. Those figured in the under view of 

 the maxillaries (fig. 1) are about the same size. They are slightly restored at the apices, 

 which are a little splintered, but as sufficient of the points of the teeth remained to show 

 that they were unworn, and the restoration was most carefully copied from exactly 

 similar teeth, it is probable that it is perfectly exact. We have also figured specimens 

 of the smaller form, which occurs in all the deposits which produce the larger, and were 

 probably the canines of females (PI. VI, VIII, and XI, fig. 7). At the time the plate 

 was lithographed the last specimen was the smallest we had met with. We have, 

 however, lately seen the teeth which were referred to, at p. xxi of the " Introduction," 

 as probably those of Felis atitiqiia, on the authority of drawings shown us by Colonel 

 Wood. The examination, however, of the teeth themselves, proves that they differ from 

 those of that animal, and of its existing representative Felis pardus, in precisely the 

 same respects, except size, as do ordinary canines of Felis spelaa, although they are very 

 slightly larger than those of the former animal. We must therefore consider them as 

 abnormally small specimens of teeth of F. spelaa, unless they afford the only known 

 traces of another species. The great variations in size are given in the Table of Measure- 

 ments of the Teeth. 



The long recurved conical crown of the tooth {a) is supported by a strong sub- 

 cylindrical fang, truncated at the base, that extends in old animals further into the 

 maxillary than the suborbital foramen. The inner surface of the crown is somewhat 

 flattened, and bounded intero-anteriorly and posteriorly by two sharp ridges passing from 

 the apex to the base. In the unworn tooth the anterior of these is very slightly, and the 

 posterior strongly serrated. This is also the case in other larger Feles, and corresponds 

 with the similar character which is more highly developed in Machairodus. The intero- 

 anterior ridge ends in a small basal tubercle {b) -. each of the external and internal 

 triangular areas defined by their ridges and the base of the crown are traversed by two 

 longitudinal furrows {sillons), of which the anterior is the deeper. The external 

 surface of the crown is highly convex. The fang is considerably thickened in 

 old age by a deposit of cement (fig. 6). The external contour of the whole tooth is a 

 simple convex curve ; that of the internal, in the old animal (fig. 6), presents a double 

 curvature, whereas in the young (fig. 5) it forms a very obtuse angle with a sHght bulge 

 at the base of the crown. The anterior aspect is slightly sigmoid, the fang bending 

 slightly outwards, and the conical point inwards. 



The canines are separated from the incisive border by the canine fossa, and by a 

 small diastema of very variable extent from the first of the premolar series. 



