Vor. Il, Pt. 11] LOOMIS—A REVIEW OF THE TUBINARES 47 
Macronectes giganteus (Gmelin): Giant FULMAR 
Fulmarus glacialis (Linneus): FULMAR 
Priocella antarctica (Stephens): SLENDER-BILLED FULMAR 
Thalassoica antarctica (Gmelin): ANTARCTIC FULMAR 
Covrs—Thalassoica antarctica, III, 31, V, 192. 
SaLtvin—Thalasseca antarctica, 392. 
GopmMan—Thalasseca antarctica, xliii, 161, pl. 42. 
Petrella capensis (Linneus): CAPE PETREL; PINTADO 
> PETREL 
Halobzna cerulea (Gmelin): BLUE PETREL 
Coves—Halobena cerulea, IV, 163, 171. 
Satvin—Halobena cerulea, 431. 
GopmMan—Halobena cerulea, |, 281, pl. 81. 
The description fails to show that Halobaena murphy: 
Brooks! signifies more than a variation in the size and form 
of the bill in Halobena cerulea. 
Pachyptila vittata (Gmelin): PRION 
Coves—Zstrelata desolata, IV, 155, 171, in part; Pseudoprion Banksui, 
IV, 166, 172; Pseudoprion turtur, IV, 166, 172; Pseudoprion ariel, 
IV, 166, 172; Pseudoprion brevirostris, IV, 167; Prion vittatus, 
IV, 169, 172. ; 
Satvin—Prion vittatus, 432; Prion banksi, 432, 434; Prion desolatus, 
432, 434; Prion ariel, 432, 436. 
Gopman—Prion vittatus, li, 285, pl. 82; Prion banksi, li, 289, pl. 83; 
Prion desolatus, li, 293, pl. 84; Prion brevirostris, li, 297, pl. 85. 
I have searched the literature in vain for a description of 
constant characters separating “P. banksi,”’ “P. desolata,” and 
“P_ brevirostris’ from P. vittata. So far as the evidence 
shows, the variations upon which these supposed species rest 
are inconstant and therefore are not of specific significance; 
as absence of intergradation, not degree of variation, gives 
specific value to characters. The series before me is a meager 
one, but it strengthens the conviction that the variations are 
all within the limits of a single species. Ample series from 
PAF a i tN i 3 UCase 
1Bull. Mus. Comp. Zool., 1917, v. 61, p. 146. 
