60 



BULLETIN 36, UNITED STATKS NATIONAL MUSEUM. 



DELPHINUS KOSEIVENTKIS Wagner.* 



Dclphinits roscivcntris, Wagner, Schrebei's Siingetb., PI. CCCLX, fig. L 

 Dauphin a ventre rose, Jaf quiiiot & Piiclierau, Zool. Voyage Astrolabe et Zelde, iii, 

 1853, p. 39; Atlas, PI. 22, fig. 2, PI. 23, figs. 3-4. 



I am led to retain this species in the genus Belphinus (restricted) on 

 account of the form of the pahite and tlie style of coloration of the 

 exterior. 



Pucheran and Jacquinot had three skulls before tliein when at work 

 upon their account of the species. Two of tliese skulls, Nos. ^3020 and 

 rt3027, are in the Paris Museum ; the third (apparently) is No. 509 of 

 the museum of Cambridge University. There are figures of both skull 

 and exterior in the atlas of the voyage, and the former is also figured 

 in Messrs. Van Beneden and Gervais' Osteographie, PI. xxxviii, figs. 

 and 6a. 



The skulls are peculiar for their small size and the unevenness of the 

 surface of the different bones. Tfie palate shows a condition in some 

 measure intermediate between that found in Prodclpkiuus and that char- 

 acteristic of Belphinus. The pterygoids are narrow and small, as in 

 Delphinus, and a distinctly marked channel extends on either side of 

 them nearly to the extremity of the beak. These channels are in no 

 wise so deep, however, as in D. delphis or D. longirostris 



In proportions it differs from the other species of the genus. Its small 

 absolute size would alone serve to distinguish it from the remaining 

 species. 



Tahle of measurements. 

 DELPHINUS ROSEIVENTRIS. 



* So far as I have been able to ascertaiu, tbe custom of citing Wagner as tbe antlior- 

 itj' for tbe name of tbis species bas arisen simply from tbe fact tbat tbe name occurs 

 on one of tbe plates wbicb accompany tbe seventb part of Scbreber's Sdugethiere. 

 Tbe species is not mentioned in the text, nor even iu tbe list of plates. 



t L' Astrolabe, 1840. 



t Voyage de I'Astrolabe. 



