PHTSETEEID-E. 71 



48489. A very similar vertebra. Purchased, 1 875. 



29613. A middle caudal vertebra, belonging to a different species 

 from the two preceding specimens. Purchased, 1852. 



48483. A caudal vertebra. Purchased, 1875. 



48484. A caudal vertebra, of a more elongated type. 



Purchased, 1875. 



48485. A caudal vertebra. Purchased, 1875. 

 28272. A caudal vertebra. Purchased, 1852. 



Mesoplodon tenuirostris (Owen *). 



Syn. Ziphius tenuirostris, Owen 2 . 



Dioplodon tenuirostris, Gervais 3 . 



This species appears closely allied to the preceding, but the median 

 groove on the superior surface of the rostrum is apparently wanting, 

 the posterior portion of the latter is wider, the gibbosity placed 

 rather more anteriorly, and the vertical thickness in advance of this 

 point somewhat greater. "Whether these characters are specific or 

 merely individual or sexual cannot be determined. 



Jiab. Europe (England and Italy 4 ). 



27601. The cranial rostrum, imperfect anteriorly ; from the Red 

 Crag of Suffolk. This specimen is the type, and is figured 

 by Owen in the 'Crag Cetacea ' (Mon. Pal. Soc.), pi. v. 

 figs. 1, 2, and by Gervais in the ' Osteographie des Cetaces/ 

 pi. xxvii. fig. 8. Purchased, 1852. 



39458. The cranial rostrum, imperfect ' anteriorly ; from the Red 

 Crag of Felixstowe, Suffolk. Purchased, 1865. 



Mesoplodon gibbus (Owen 5 ). 



Syn. Ziphius giblus, Owen 6 . 



Dioplodon gibbus, Gervais 7 . 



In this species the mesethmoid band is very prominent at the 

 base of the rostrum, and the gibbosity in the middle is strongly 



1 Crag Cetacea (Mon. Pal. Soc.), p. 24 (WO).- Ziphius. 



2 Loc. cit. 



3 Osteographie des Cetaces, p. 422 (1868-79). 



4 See Capellini, Mem. Ac. Sci. 1st. Bologna, ser. 4, TO!, vi. p. 296 (1885) 

 6 Crag Cetaeea (Mon. Pal. Soc.), p. 17 (1870). Ziphius. 



6 Loc. cit. 



7 Osteographie des Cetaces, p. 421 (1868-79). 



