80 



©ilijginal Jiiiii4li;.^» 



X. — On the Dentition oe IlTiENA spelj^a, and its taeieties, 

 WITH Notes on the eecent Species. By W. Boyd Dawkins, 

 B.A.. Oxon. r.Gr.S. Geological Survey of Great Britain. 



Inteoductiox. 



§ I. Recent Siiecics. — a. H. striata.— h. H. hmnnea.—c. B. crocuta. (p. 80.) 



§ II. Fossil Species, (p. 82.) 



§ III. H. spelcea. — A. Milk Molar Dentition. — b Comparative measurements of 

 Milk Teeth. — c. Succession of permanent Teeth.— d. Upper permanent Dentition. 

 — E. Lower permanent Dentition, (p. 83.) 



§ IV. H. hruyinea, Fossil in Britain ? (p. 94.) 



§ V. H. spelcea, a true H. crocuta. (p. 95.) 



§ VI.^Table of Comparative Measurements of Permanent Dentition of Recent 

 and Fossil Species, (p. 95 ) 



In tlie course of the determination of the vast quantity of organic 

 remains from "Wookey Hole Hyaena-den,* upwards of 200 jaws and 

 500 teeth of Ilycena spelcea of all ages, and showing considerable 

 variations from the typical form, passed through my hands. My 

 only excuse for adding the following notes about them, to a literature 

 already so bulky, is that they clear up some of the doubtful points 

 in the researches of MM. Croizet and Jobert, Marcel de Serres, De 

 Blainville, and others, relative to the value of certain differences 

 assumed to be specific in the milk and permanent dentition of the 

 Spelaean Hysena. Before, however, I can enter upon these, I must 

 briefly run over the differences which obtain in the dentition of the 

 three existing species of the Genus. 



§ 1. The genus Ilycena is characterized by a dental formula, inter- 

 mediate between the Canidae on the one hand, and the FelidaB on the 



other, the deciduous series consisting of .,' „' ,-,' " -^ ' ' , and the 



^ 1. 3. C. 1. Dm. 3. ' 



permanent of ?• t ^- V ?!"■ t ^I" j " 



^ 1. 3. C. 1. Pm. 3. M. 1. 



A. Of the three species into which it is divided, the most common, 

 ranging through North Africa, Asia Minor, Arabia and Persia, and 

 extending down to the Cape, H. striata, Zimmer. {H. vulgaris, Cuv.), 



* See two papers hy the Author. Quart. Journal Geol. vol. xvii. p. 115. vol. 

 xix. p. 260. 



