R. Lydekher — Note on AnthracotJieriidce. 547 



logical Memoirs," belongs. It is also desirable that that specimen 

 also should be refigured on a larger scale. 



It may be added that the half of a cranium represented in plate 

 Ixvii. fig. 2 of the " F.A.S." under the name of M. dissimilis, really 

 belongs to a species of Sus. 



The canines of Merycopotamns are relatively large and pig-like, 

 but the extremity of the upper one is not recurved as in Sus. 



lY, — Note on the Anthracothekiid^ of the Isle of Wight. 

 By E. Lydekker, B.A., F.G.S., F.Z.S. 



AN examination of the fine series of the remains of AnthracotJie- 

 riidce from the Hempstead beds of the Isle of Wight contained 

 in the British Museum, and their comparison with specimens and 

 casts of the remains of the allied Continental forms, has led to the 

 following conclusions. Some of the specimens w^ill be figured on 

 a future occasion. 



Hyopotamus velaunus (Cuvier).^ 



Syn. Hyopotamus vectianus, Owen- (in parte). 



The lower jaws of the smaller hypsodont form from Hempstead, 

 which were described by Owen under the name of R. vectianus, agree 

 precisely with those of H. velaunus from Ronzon ; and may, there- 

 fore, be referred to that species. The identity of these two forms 

 has been already indicated by Dr. Filhol.^ The upper molars figured 

 by Sir R. Owen, op. cit. pi. vii. figs. 6, 7, as an associated set of 

 H. vectianus, belono- to difi"erent individuals : but it cannot be deter- 

 mined whether they really belong to H. velaunus or H. hovinus. 



Hyopotamus bovinus, Owen.* 



Syn. Bothriodon leptorhj/nchus,Ajm&vd.^ Ancodus aymardi, Pomel.® 

 Complete specimens of the upper cheek-dentition, as well as 

 specimens of the mandible and a broken occiput of Hyopotamus 

 hovinus from Hempstead, agree so exactly with the corresponding 

 remains of the so-called U. (B.) leptorhynchiis from Ronzon that 

 there seems no doubt as to the specific identity of these two forms. 

 The names hovinus and leptorJiynchus were apparently published in 

 the same year ; but as the memoir in which the former occurs was 

 read in 1847, that name is adopted for the species. Dr. Kowalevsky 

 seems to have considered the large Hempstead and Ronzon Hyopo- 

 tamus as specifically the same, since he figures an upper molar from 

 the latter locality under the name of H. hovinus.'' 



Hyopotamus pokcinus, P. Gervais.^ 

 Among the Isle of Wight fossils are several specimens of frag- 



1 Ossemens Fossiles, ed. 2, vol. v. pt. 2, p. 506 (1822). 



2 Quart. Journ. Geol. Soc. vol. iv. p. 103 (1848). 



3 Ann. Sci. Geol. vol. xii. art. 3, p. 189 (1881). 



* Quart. Journ. Geol. Soc. vol. iv. p. 103 (1848). 



5 Ann. Soc. Agric. Sci. le Puy. 1848 {teste Filhol). 



« Catalogue Methodique, p. 92 (1853). 



■^ Palseontographica, vol. xxii. pi. xii. fig. 71. 



8 "Zool. at Pal. Fran9aises," 1st ed. vol. ii. No. 31 (1848-52). 



