222 TJNGULATA. 



regard to the Hempstead hypsodont form of the genus, the asso- 

 ciated series of upper cheek-teeth and mandibles in the Museum 

 collection agree precisely with the corresponding parts of the so- 

 called H. leptorhynchus from Ronzon, and the two have therefore 

 been identified *. The specific names bovinus and leptorhynchus 

 were apparently published in the same year ; but as the memoir in 

 which the former name occurs was read in November 1847, and 

 was published in a better-known serial than the latter, the name 

 H. bovinus is adopted for the species. With regard to the upper 

 teeth figured by Owen (op. cit. pi. viii. figs. 6, 7) as an associated 

 series under the name of H. vectianus, it appears from the specimens 

 in the Museum collection that they really belong to different indi- 

 viduals, as is indeed shown by the circumstance that at the time 

 of the protrusion of m. 3, mm. 4 (which is reckoned by Owen as 

 pm. 4) would have been replaced by pm- 4; the tooth figured as 

 m. 3 is, moreover, too small in proportion to the preceding teeth. 

 That some of these smaller upper teeth really belong to H. velaunus 

 ( = H. vectianus) is most probable; but it has been found impossible 

 to distinguish them from those of //. bovinus, as a series of detached 

 upper molars might respectively be equally well regarded as m- 1, 

 m. 2, and m. 3 of -H. velaunus, or as mm. 4, m. 1, and m. 2 of H. bo- 

 vinus. Under these circumstances, and since no associated series 

 of the upper molars of the smaller form are known from the Isle 

 of Wight, all the upper teeth are referred to H. bovinus ; but it 

 must be borne in mind that in the cases of isolated small teeth, or 

 two associated small teeth, it is quite probable they may belong to 

 H. velaunus, when they will occupy one place earlier in the series 

 than is here assigned them. 



H. bovinus is a typical hypsodont form. 



Ilab. Europe. 



M. 1941. Cast of the greater portion of the cranium, showing all 

 the dentition except the incisors, of which the alveoli 

 remain. The original of this specimen is the type of H. 

 leptorhynchus, and is from the Lower Miocene of Ronzon, 

 near Puy-en-Velay (Haute-Loire), France ; it is figured 

 by Kowalevsky in the Phil. Trans, for 1873, pi. xxxix. 

 fig. 1, under the name of Hyopotamus sp., and by Filhol 

 in the Ann. Sci. Geol. vol. xii. pi. xv., under the name 

 of Ancodus leptorhynchus. Presented by Dr. KowalevsJcy. 



30055. The occiput, in a crushed condition ; from the Hempstead 

 beds (Lower Miocene) of the Isle of Wight. This speci- 

 1 Vide Geol. Mag. dec. 3, vol. i. p. 547 (1884). 



