384 ON THE PETRELS COLLECTED DURING 



In (Estrelata (PI. XV. fig. 12)*, Majaqueus, Bulweria, and Puffinus 



Zool. Chall. obscurus the tongue becomes more fleshy, and slightly grooved above, 



ptTxi. p. 20." especially anteriorly. The sides, moreover, are edged by a series of large 



triangular backwardly directed papillae, extending forwards for about the 



back half of the length of the tongue, but in Puffinus to nearly its apex. 



In Puffinus brevicauda (fig. 14) there are, in addition, four longitudinal 



fairly regular rows of such papillae developed on its dorsal surface, those 



nearest the middle line being the biggest. 



In the species of the genus Diomedea (fig. 3) the tongue is also 

 similarly covered above, pretty uniformly, with spines, best developed on 

 the dorsum a little behind the apex of the organ, but is much shorter in 

 form, being of an elongated cordate shape. In Phcebetria (fig. 4), on the 

 other hand, the tongue is much more pointed and elongated, being free 

 for about its apical two thirds, and with the dorsal surface glabrous, the 

 spines being confined to its basal margin. In a nestling of this species 

 the tongue has much the same shape, but is covered for the greater part 

 of its extent above by spines, as in Diomedea : these must therefore 

 disappear as the bird reaches maturity. In Thalassiarche the tongue is 

 somewhat intermediate in shape, though most resembling that of Phcebetria. 

 Pagodroma (fig. 8) has a very elongated, tapering tongue, with its base 

 and lateral margins for about their posterior quarter spinulose. The 

 tongue of Daption (fig. 7) is much broader and more fleshy ; the spines 

 are small, and almost confined to its base, with only a few very obsolete 

 ones towards the posterior angles laterally. It is only free for a little 

 more than a quarter of its length. Prion (fig. 10) is similar, but the 

 tongue is more fleshy, and the spines are smaller and quite confined to 

 the base ; the apex is also only free for a very small extent. In Prion 

 vittatus the tongue becomes extremely large and fleshy, occupying the 

 whole of the wide space between the raini of the mandible. Aeipetes 

 antarcticus (fig. 6) has a tongue very like that of Pagodroma, but of 

 course larger and less elongate : that of Thalassoeca glacialoides is very 

 similar, but longer a little than that of Aeipetes. In all these forms the 

 tip is blunt or emarginate, with a slight dorsal groove apically. Fulmarus 

 has a more fleshy tongue of the same type, with a distinctly emarginate 

 end, and a more evident groove, extending for two fifths of its length. 



* I have figured (fig. 13) on Plate XY. a tongue of different form from any other 

 known to me as occurring in the group of Petrels. It has been labelled " (Estrelata 

 brevirostris," but does not agree with the other species of that genus (lessoni and mollis) 

 examined by me nor with any of my young specimens of the so-called (Estrelata 

 brevirostris, these resembling rather the species just named. This tongue is remarkable 

 for having no spines laterally, those of the base being well developed, and for its 

 narrow and deeply grooved form and slightly emargiuate tip. In spite of its label, it 

 belongs, I strongly suspect, to some species of the Laridic. 



