54 THE VOYAGE OF H.M.S. CHALLENGER. 
(except in Procellaria where it is just) but shorter, and the same is always the case 
when it is compared to the ulna. It is never twice as long as the femur. The tibia 
is only a little, or not at all, longer than the humerus or manus. 
Name. Humerus. UlIna. Manus. Femur. Tibia. Peer ece, at ue 
hgh 
Oceanites oceanicus, . ‘ : 23 21 34 6||_~— od 50 35 28 
Garrodia nereis, . ; : : 20 17 26(2)1) 14 51 34 25 
Pelagodroma marina, . ; : 27 24 37 18 60 41 35 
Fregetta melanogastra, . é : 27 23 36 19 56 38 26 
| SEE SS] — | | EE 
| Cymochorea leucorrhoa, : é 35 35 AD 16 St Wy pare et 26 
Procellaria pelagica, . 3. 26 24 Fee ale 33 22 20 
Bulweria columbina,  . : 3 62 62 63 20) 42 28 28 
| “ Gestrelata grisea,” . : : 81 83 84 31 61 36 43 
Majaqueus cequinoctialis, — . 0 151 154 143 51 116 67 81 
Adamustor cinereus, . A < 134 132 127 5O eS) 108 62 78 
| Puffinus anglorum,  . : 5 79 72 86 Sih ae 46 51 
» obscurus, : : 2 66 3 71 2 WS 40 44 
Duption capensis, : : . 86 84 O15 Ce SO 46 56 
Aeipetes antarcticus,  . 2 5 98 93 100 | a 88 44 56 
Thalasseca glacialoides, ; 5 115 113 118 48 96 57 68 
Fulmarus glacialis, —. . c 118 116 117 50 113 54 67 
Ossifraga gigantea, . : : 243 236 212 || 88 184 94 130 
Prion desolatus, . : : : 57 56 56 23 53 32 35 
Pelecanoides urinatrix, : : 43 33 44 23 46 24 27 
Diomedea exulans, j ‘ i 428 417 290 110 246 124 168 
3 brachyura, . ; 5 281 285 222 76 175 96 122 
Thalassiarche melanophrys, . 5 259 262 202 80 161 83 118 
IV. THE CLASSIFICATION OF THE TUBINARES. 
The propriety of the division of the entire order Tubinares into two main families, 
which must be termed the Oceanitide and Procellariidee,’ first proposed by Professor 
Garrod in 1873 (vide supra, p. 9), has been fully borne out by my further investigations 
into the structure of these forms. To the differences in their myological formule, and in 
the presence or absence of caeca, may now be added numerous other points, both external 
and internal. 
The Oceanitidee agree together in having the following peculiarities which are not 
shared in—with one or two exceptions marked by an*—by any of the Procellariudee :— 
The number of secondary remiges is never more than ten. The tarsi are not uni- 
formly reticulate, but are either ocreate, or covered by large transversely-oblique 
1 Tmperfect in the specimen measured. This length is estimated. 
2 Cf. Proc. Zool. Soc., 1881, p. 737. 
