14-J THE VOYAGE OF H.M.S. CHALLENGER. 



Thalassidroma segethi seems to be intermediate in dimensions ; but so far as the 

 description goes, its identity with Fregetta graUaria is obvious. 



Mr Sharp (Zool. Kerg., Aves, p. 31) suggests that Procellaria leucogastra may prove 

 to be a stage of plumage of Procellaria melanogaster ; but I cannot think that this will 

 ever turn out to be the case. 



3. Fregetta melanogastra, Gould. 



Thalassidroma melanogastra, Gould, Ann. and Mag. Nat. Hist., vol. xiii. p. 367, et B. Austr., 



vol. vii. pi. lxii. 

 Fregetta melanogastra, Salv., Proc. Zool. Soc, 1878, p. 736. 



[a. Betsy Cove, Kerguelen.] 



Mr Sharpe (Zool. Kerg., Aves, p. 30) unites Thalassidroma tropica, Gould, with this 

 bird, and calls it by the last-mentioned name. They may lac identical ; but in any case 

 the adoption of the name tropica in place of melanogastra cannot be justified, as the 

 latter, having been in use for over thirty years, ought not to be supplanted by the former, 

 the two having been published simultaneously on opposite pages of the same publication. 



4. Pelagodroma marina, Lath. 



Procellaria marina, Lath., Ind. Orn., p. 410. 



Pelagodroma marina, Salv., Orn. Misc., vol. ii. p. 228 ; Proc. Zool. Soc, 1878, p. 736. 



[a-c. Nightingale Island. 



Eyes black ; a night-bird. These Petrels were taken out of holes in the ground 

 during the day by help of the dogs.] 



5. Thalassceca glacialoides, Smith. 



Procellaria glacialoides, Smith, 111. Zool. Soc. Afr., pi. Ii. 



Thalassceca glacialoides, Coues, Pr. Ac. Phil., 1866, p. 30 ; Salv., Proc. Zool. Soc, 1878, p. 736. 



[a. Male. Ice Barrier. February 23, 1874. 



These Petrels were only seen in the neighbourhood of the Antarctic Ice, and in small 

 numbers, in company with Thalassceca antarctica and Pagodroma nivea.~] 



G. Thalassceca antarctica. Gaim. 



Procellaria antarctica, Gaim., Syst. Nat., vol. i. p. 565. 



Thalassceca antarctica, Coues, Pr. Ac. Phil., 1866, p. 31 ; Salv., Proc. Zool. Soc, 1878, p. 737. 



[a. Male. Ice Barrier. February 14, 1874. 



b. Male. ) T _ . 



7 _ . >Ice Barrier. February 14, 1874. 



c, d. Jemales. ) J 



