REPORT ON THE ANATOMY OF THE PETRELS. 



23 



Ci/mochorea seems here to have progressed further still. The intestines are not capacious, 

 but the commencing duodenum may be slightly dilated. 



The liver is usually about equilobed, the lobes not being large, and rather triangular 

 in shape. In the Albatrosses, however, the right lobe becomes elongated and distinctly 

 bigger. The gall-bladder, developed on the right hepatic duct, is always present so far 

 as my observations extend. The hepatic ducts (PI. II. fig. 1, r.h.d., l.h.d.) open close 

 together into the ascending arm of the duodenal loop, close to the pancreatic ones, of 

 which there are usually two or three in Majaqueus. In the specimen of Thalassceca 

 glacialoides dissected the left hepatic duct divided, soon after leaving the liver, into 

 two branches, each of which opened separately into the duodenum, so that altogether 

 this received three ducts from the liver. The vitelline rudiment is not to be found in 

 the adult birds. The bursa fabricii, in young birds at least, is a well-developed 

 large sac, with thick glandular walls, and a small opening into the cloaca. The spleen is 

 circular, or nearly so. 



3. Myology. 

 The myology of the Tubinares presents many features of interest, as will be seen 

 from the following description. The species of the group, broadly speaking, resemble 



