216 Transactions. — Zoology. 



with the extremities and the webs perfectly black. The present bird differs 

 further in having the breast and abdomen almost entirely ashy-grey, but this 

 colour is passing off, and therefore seems to indicate a comparatively young 

 bird in a transitional state of plumage. The inner surface of the wings is 

 pure white, but there is a broad band of slaty-black extending from the 



spreads 



outer edge. 



vffinis. Sp. nov. 



Diag. — Supra saturate cinereus; dorsi plumis et supra-caudalibus nigro 

 terminatis ; alarum minimis et ala spuria nigricanti-brunneis ; primariis extus 

 nigricanti-brunneis, intus albis ; secundariis pallide cinereis, albo anguste 

 marginatis, basaliter albis ; rectricibus saturate cinereis, duabus externis intus 

 albidis; fronte alba cinerascenti-nigro varia ; regione suboculari conspicue 

 cinerascenti-nigra ; facie laterali guttureque albis ; pectore imo et abdomine 

 cinereis plumis basaliter albis J corpore reliquo subtus alba, pectoris lateribus 

 cinereo lavatis, hypochondriis et subcaudalibus inferioribus cinereo variis et 

 minute transfasciatis ; subalaribus albis, exterioribus conspicue nigricantibus : 



nigro 



nigris 



Hah. — New Zealand. 



Comparative Statement of Measurements. 



P. coohiL P. qffinis. 



Extreme length .., ... 12-5 inches 13 inches 



Wing from flexure ... ... 9-25 „ 10*5 



• • • ... ... 4: ,, 4: 



Tail 



Culmen (following curvature) ... 1-4 „ 1-25 



Lower mandible (from the gape) 1-5 „ 1-5 



j; 



5? 



>> 



?7 



Bare tibia 

 Tarsus 



• • ♦ . * 



■5 



• • *•• ♦ ♦ ■ 



12 „ 1-2 „ 



Middle toe and claw ... ... 1-5 „ 1-75 j? 



In Procdlaria leucoptera and P. mollis again we find very similar plumage ; 

 but the former (according to Gould) has the wing 2 inches shorter, although 

 the other proportions are the same; while Procellaria mollis, on the other 



longer. It has, moreover, a larger tarsus. 



ffi 



The 



very natural group or sub-genus. 



