5. LAOENOBHTNCHTJS. 269 



Skull : beak one-fourth longer than the length of the brain-cavity, 

 and rather longer than double the width of the skuU at the notch ; 

 teeth to the notch (see fig. Eeichenb.). 



Cassin, I. c, describes, " Teeth ^^^=160. Form elongate, the 

 dorsal fin being nearest the head ; colour dark blue-grey, the fins and 

 back nearly black ; a dark line connects the corners of the mouth 

 ■with the pectoral fins ; front and sides dark grey, covered with small • 

 vermicular white spots ; end of the snout white ; commissure of the 

 lips pale yellow. 



" Total length 6 feet 7 inches, perpendicular diameter at the dorsal 

 fin 13 inches." 



" Inhab. Pacific Ocean." 



" Though Mr. Peale's figures, from which those in the plate of the 

 Atlas to this volume have been prepared, differ in some measure from 

 the figures of D. caeruleo-aTbus, in the distribution of the light and 

 dark colours, we have no doubt of the identity of the present animal 

 with that species. The figures of the latter to which we more espe- 

 cially aUude are that of its first describer in ' Nova Acta Physico- 

 medica Academise Csesarse Leopoldino-CaroUnsB Naturae Curiosorum,' 

 xvi. pi. 43. fig. 2, and those in Schreber's ' Saugethiere,' pi. 363, and 

 in Eeichenbach's ' Cetaceans,' pi. 14. fig. 43. 



"Taken in the Pacific Ocean, latitude 2° 47' 5" S., longitude 

 174° 13' W. of Greenwich, on the 22nd of August. 



" We find no specimen in the collection of the Expedition." 



3. Lagenorhynchiis Asia. The Asia. 



Skull : nose rather depressed, broad, flattened, rather contracted 

 in the middle of each side ; triangle concave, with a shghtly raised, 

 flat, rugose space in the front half ; teeth |-|-, small. 



Lagenorhynchus Asia, Ch-ay, Zool. Ereb. §• Terror, 1. 14 (skull) ; Cat. 

 Cetac. B. M. 1850, 101. 



Inhab. ? 



a. Skull (teeth wanting). The specimen figured in the ' Voyage of 

 the Erebus and Terror,' 1. 14. 



The skull, which is without teeth, very much resembles, in the 

 depressed and expanded form of the brain-cavity and shape of the 

 beak, the skuU of L. Elecfra, but it differs from that in the beak being 

 rather more acute in front and more contracted in the middle of the 

 sides, and in being rather smaller in size. It may be only a variety 

 of that species. It measures as follows : — 



SkuU : Length, entire 16| inches. 



Length of nose 9 „ 



Length of lower jaw 12i „ 



Width at orbit 8| „ 



Width at notch 4| „ 



Width at middle of beak . . 3| „ 



