SOME OBSERVATIONS ON ANTARCTIC CETACEA. 503 



a quickly moving animal in the case of Dr LIOITVILLK, the two animals closely 

 resemble one another in form if they are not actually identical. ' 



The markings, however, of Dr LIOUVILLK'S animal and mine are decidedly 

 different. The Bal&na specimen is mainly white, and its markings are Mack 

 rather than brown. The whole head, dorsallv as far as the line of the base of 

 the pectoral fins, laterally less far back, thence just past the axilla, and extending 

 back in a central ventral line as far back as the extremity of the pectoral fin. 

 is black, with the exception of the throat. The snout is black, not white, as in 

 Dr LIOUVILLE'S drawing, and sn are both upper and lower lips. The tail is entirely 

 black: ventrally this black extends forward to half way between the root of tin- 

 tail and the vent; doi'sally forward of the dorsal fin, which is itself black, to the 

 middle of the back. All the rest of the bodv is white. There is no lateral stripe 

 as in the case of Dr LIOUVILLK'S drawing. I am inclined, however, to think that 

 this is a polymorphic form of the same animal, especially as His Ivxcellency \Y. L. 

 ALLARDYCE, formerly Governor of the Falkland Islands, tells me that his impression 

 of the Falkland Islands porpoise is that it is somewhat striped. Mr LYDKKKKK is 

 of similar opinion to myself that the r><il;rn specimen is like Dr Lior VII.LK'S 

 Lagenorhynchus <Tin-i</<T, (). and ({.; but in the absence of the skeleton this 

 determination cannot be absolutely relied on. 



The following is TKTK'S description I of the genus /x^/''"'"'/'//'"'/"'- s ' and of 

 Lagenorhynchus 



"7. Lagenorhynchus, Gray. 



" liostrum large and broad. Rostral portion of intermaxilta Hat (somewhat 

 convex in obliijuidens and electra). Pterygoid bones in contact or separate. 

 Symphysis of mandible short. Teeth variable in size, '2'2 to 45. Vertebrae, 

 73 to 92. 



" Head with a short, ploughshare-like beak (not distinctly marked off from the 

 forehead in obscimis). Dorsal and pectoral fins moderate, falcate. Caudal rid^e- 

 very prominent. Sides with two areas of light colour separated bv irregular. 

 oblique dark bands. 



" Lagenorhynchus crncnjer ( !>'< h-hignv and (iervais). (PI. xxv. figs. 1 and '_'.) 



" Beak short, only slightly marked off from the convexity of the forehead. Mu/y.le 

 to the corner of the mouth, forehead, back, dorsal tin. tail, and pectoral fins black. 

 On the sides, from the eye ami base of the pectoral fins to the tail, a broad black 

 band. This band is broadest above the base of the pectoral fin. and decreases in 



de 1'Antaretique," ]>ai' le Dr J. LIOUVILLB (Heiuciriite Ksj:i : ilitin/< Antarctiqut l-'niti<;n'.--e, Pari., 1913), 



pp. Hi:. 17'.). 



t "Cinitrilintiniis to the \.-itnr.-il lli.-tnry ot tin- (Vt.-inMiis : a Ui-view of tlie Family lK-lpliinii.hr,' 1 liy FUKDEUICK 

 \V. Turn, Ilnlletin of Ike Unite*! St,it,:< .\ntiwml M u.<, inn, No. :i6, pp. 108, 17U, 171, Wellington, 1889. 



