10 THE VOYAGE OF H.M.S. CHALLENGER. 
1879. Dr. Hans Gadow, in his paper on the digestive organs of birds,! describes the 
alimentary viscera of the Tubinares, apparently based upon an examination of the four 
genera Puffinus, Fulmarus, Procellaria, and Diomedea. The arrangement of the intes- 
tinal folds is “ orthoccoelic,” the intestine being disposed in eight folds lying close to and 
parallel with each other. In their orthoccelic character the Tubinares agree with the 
Steganopodes and Erodii, differing from the “cycloccelic” Pelargi, Raptatores, and 
Laridee. 
1881. In a posthumous paper,’ published in the “ In Memoriam ” volume of his works, 
the late Professor A. H. Garrod describes the anatomy of the Diving Petrel (Pele- 
canoides urinatrix), based upon an examination of specimens collected during the 
Challenger’s voyage. Pelecanoides has no ambiens muscle, in which respect it differs 
from all the other true Petrels, and resembles Bulweria alone of them in its formula 
A.X. The main vein of the leg, the femoral vein, is superficial to, instead of deep of, the 
tendon of the femoro-caudal muscle, a peculiarity hitherto only observed in the genus 
Dacelo amongst the Kingfishers. ‘The Procellariidee may be divided into the Storm- 
Petrels or Thalassidromine, and the true Petrels or Cistrelatinze, the former differing 
from the latter in possessing the accessory semi-tendinosus muscle.” These two groups 
therefore correspond to those already distinguished by Garrod in his former paper as the 
“ Storm-Petrels ” and the Fulmaride. 
As regards the systematic position of the Petrels it is said—‘ I may mention that since 
writing my paper ‘On Certain Muscles of Birds, and their value in classification,’ I have 
changed my views as to the affinities of the Procellariide. In that communication 
I place the family amongst the Anseriformes ; now it is evident to me that it is with the 
Ciconuformes that they are most intimately related. Reason for my change of opinion 
will be found in what here follows.” Unfortunately the paper was never completed, and 
the reasons mentioned not stated in consequence. 
In a paper read before the Zoological Society on June 18th of the same year’ I 
proposed to make the so-called Procellaria nereis of Gould, the Procellaria fregata of 
Professor Garrod’s earlier papers, the type of a genus to be called Garrodia, it being not a 
true Petrel at all, but one of the allied group without ceeca and with a formula AB.XY, 
the Thalassidrominee of Garrod, which includes besides the genera Oceanites, Fregetta, 
and Pelagodroma, the family so formed constituting my Oceanitide. 
1882. Lastly, in the concluding part of the Atlas to the great work on Madagascar,* 
1 Versuch einer vergleichender Anatomie des Verdauungs-systemes der Vogel, Jen. Zeitschr. f. Naturw., Bd. xiii. 
(nf. vi.), pp. 92-171, 339-403, pls. iv.-ix., xvi. 
85. Notes on the Anatomy of Pelecanoides (Puffinuria) urinatria, loc. cit., pp. 521, 522. 
Proc. Zool. Soc., 1881, pp. 735, 736. 
Histoire physique, naturelle et politique de Madagascar, publiee par Alfred Grandidier, xy. ; Histoire naturelle 
des oiseaux, x. iv., Atlas iii, Paris, 1881. Plates 293, 294, 297, 298, 299, 300. 
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