354 Annals of the Carnegie Museum. 



it has already been described on a former page. There are 4 humeri 

 in fairly good condition ; 2 nearly perfect ulnae, also 2 ossa quadrata. 

 All of these bones belong to the '' Cahow," and need not be referred 

 to especially again, as there is ample duplicate and far more perfect 

 material in the other two collections for the purposes of description. 



2: This is the most extensive collection of the three; not only does 

 it contain a large representation of the bones of the " Cahow " in 

 excellent condition, but also the sternum of a new species, and a lot of 

 bones representing some smaller tubinarine form — both of which, to- 

 gether with the " Cahow " bones, will be described in detail further on. 



3: We have here a smaller collection than the last (No. 2), though 

 withal a most interesting and perfect one. It is chiefly made up of 

 the bones of the " Cahow," and of some very important ones of the 

 more diminutive tubinarine species referred to as being found in the 

 McGall collection. It will, on the whole, very materially contribute 

 to the working up of the specimens before me. 



I shall first describe the unique sternum, referred to as forming a 

 part of collection No. 2. 



PuflBnus mcgalli, sp. nov. 



(Plate XXII, fig. 29, and Plate XXIII. fig. 36.) 



[Recent Epoch.] 



Based on an almost perfect sternum of an adult individual discov- 

 ered in the bird-bone caves of Bermuda. 



The specimen indicates that it belonged to a species of Puffinus 

 of moderate size, and probably possessed characters typical of the 

 genus. Judging from the sternum sent me by Mr. Maynard (see 

 antea and the plates), it was a considerably larger bird than Puffinus 

 IJicrminieri, as the length of that bone in the first measures — from the 

 anterior tip of the manubrium to the extreme posterior point of the 

 mid-xiphoidal process — 5.8 cms., while in the latter this line or dis- 

 tance equals but 4.4 cms. From apex to apex of the " coracoidal 

 processes," P. mcgalli measures 3.3 cms. and P. Ihcrminlcrl but 2.5 

 cms. Either of these sterna possesses six articular facets on each 

 costal border for the costal ribs. Upon comparing this sternum with 

 the sternum of "Puffinus major" (No. 18076, Coll. U. S. Nat. Mus.), 

 the latter is seen to be a species very considerably larger than the 

 one here being described. I have also compared it with the sterna 



