BAL^NOPTEEA. 



555 



B. schlegeli, it differs from it materially in the character of its beak, which is long 

 and slender, and much more forwardly directed than the beak of _S. schlegeli, and 

 also in the absence of the curvature of the external margin of the maxilla which 

 distinguishes B. schlegeli. The beak of the latter is also much more downwardly 

 shelving at its base than is the maxillary of this form from the Bay of Bengal, 

 and the skull has greater depth, as is shown by the circumstance that the orbital 

 process of the maxilla in B. schlegeli is below the level of the base of the skull, 

 whereas in this skull it is above it. The opening of the posterior nares also is much 

 narrower than in B. schlegeli. The length of this skull compared with the type 

 of B. schlegeli, is only about three inches longer, but notwithstanding the addi- 

 tional length it has less breadth and less occipital length associated with a shorter 

 maxilla, less maxillary breadth, and a narrower beak. Its lower jaw also differs 

 considerably in its length from that of B. schlegeli, being nearly 4 inches shorter, 

 although its skull is longer than the skull of that type, which, according to Professor 

 Elower's^ measurement, has the lower jaw longer than its skull, whereas in Van 

 Beneden's and Gervais^ figure the lower jaw is represented as shorter than the 

 skull. The lower jaw of B. schlegeli is much deeper and heavier than the jaw of 

 this Whale, as is seen by the accompanying table of measurements, and the curve 

 also differs materially, the latter being much more outwardly curved than the former. 





B. SCHLE- 





- 



Skull measurements of B. schlegelii and of B. edeni. 2 



OELI. 



B. EDENI. 



Java- 



Sittang. 



Arakan. 





Inches. 



Inches. 



Inches. 



Length of skull, in straight line 



11600 



118-75 



124-50* 



Breadth of cond3'les ....... 







10-50 



8-75 



10-50 



,, of exoccipitals ....... 







41-00 



34-25 



39-00 



„ of squamosals (greatest breadth of skull) . 







57-00 



53-00 



58-25 



Length of supra-occipital 







29-50 



26-50 



27-50 



„ of articular process of squamosal 







22-00 



23-50 



26-00 



Orbital process, frontal length 







22-00 



29-00 



23-50 



„ „ breadth at base 







24-50 



22-00 



2300 



,, „ outer end 







15-00 



18-00 



19-00 



Length of beak from middle of curved border of maxillary to 



tip of premaxillary 





82-00 



77-50 



81-00 



„ of maxillary 







90-00 



84- .P 



88-.? 



Greatest width of nasal aperture 







10-00 







Breadth of maxillaries at posterior end , . . , 







11-00 







„ of „ across orbital processes, following curv( 







63-00 



54-50 



62-00 



,, of beak at base, following curve 







42-00 



33'00 



36-00 



„ of „ at middle 







22-25 



21-25 



23-75 



„ of maxillary, at middle ..... 







6-00 



6-75 



8-00 



„ of premaxillary, at middle 







4-00 



3-00 





Length of lower jaw, in a straight line .... 







117-00 



113-25 



11900 



Height of „ „ at coronoid process .... 







14-00 



14-00 



15-30 



„ „ „ „ at middle 







9-50 



7-00 



7-60 



Amount of curve of lower jaw 







8-50 



13-50 



14-50 



* Adding on 6-50 inches for premaxillaries. 



The lower jaw of this Whale has all the characters of the jaw of the Whale 

 described by Blyth as Balcenoptera indica, the rami having, as pointed out by him, 



1 Proc. Zool. Soc, 1864, p. 410. 



- I reproduce in this table the measurements given by Professor Flower of B. schlegeli and alongside of them 

 tJiose of B. edeni by myself. 



