10 THE VOYAGE OF H.M.S. CHALLENGEE. 



1879. Dr. Hans Gadow, in bis paper on the digestive organs of birds, 1 describes tbe 

 alimentary viscera of tbe Tubinares, apparently based upon an examination of tbe four 

 genera Puffinus, Fulmarus, Procellaria, and Diomedea. Tbe arrangement of tbe intes- 

 tinal folds is " ortboccelic," the intestine being disposed in eigbt folds lying close to and 

 parallel with each other. In their ortboccelic character the Tubinares agree with the 

 Steganopodes and Erodii, differing from the " cycloccelic " Pelargi, Raptatores, and 

 Laridse. 



1881. In a posthumous paper, 2 published in the " In Memoriam " volume of his works, 

 the late Professor A. H. Garrod describes tbe anatomy of the Diving Petrel (Pele- 

 canoides urinatrix), based upon an examination of specimens collected during the 

 Cballenger'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 

 Dacclo amongst the Kingfishers. " The Procellariidse may be divided into tbe Storm- 

 Petrels or Thalassidrominse, and the true Petrels or OEstrelatinse, the former differing 

 from tbe latter in possessing tbe 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 Fulmaridse. 



As regards the systematic position of tbe Petrels it is said — " I may mention that since 

 writing my paper ' On Certain Muscles of Birds, and their value in classification,' I have 

 cbanged my views as to the affinities of the Procellariidse. In that communication 

 I place the family amongst the Anseriformes ; now it is evident to me that it is with the 

 Ciconiiformes 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 1 8th of the same year 3 I 

 proposed to make the so-called Procellaria nereis of Gould, tbe Procellaria fregata of 

 Professor Garrod's earlier papers, the type of a genus to be called Garrod ia, it being not a 

 true Petrel at all, but one of the allied group without cseca and with a formula AB.XY, 

 the ThalassidromiuEe of Garrod, which includes besides the genera Oceanites, Fregetta, 

 and Pelagodroma, tbe family so formed constituting my Oceanitidse. 



1882. Lastly, in the concluding part of the Atlas to the great work on Madagascar, 4 



1 Vereuch einer vergleichender Anatomie des Verdauungs-systernes der Vb'gel, Jen. Zeitschr. f. Naturw., Bd. xiii. 

 (n.f. vi.), pp. 92-171, 339-403, pis. iv.-ix., xvi. 



2 85. Notes on the Anatomy of Pelecanoides (Puffinuria) urinatrix, loc. cit., pp. 521, 522. 



3 Proc. Zool. Soc, 1881, pp. 735, 736. 



4 Histoire physique, naturelle et politique de Madagascar, publiee par Alfred Grandidier, xv. ; Histoire naturelle 

 des oiseaux, x. i\\, Atlas iii., Paris, 1881. Plates 293, 294, 297, 298, 299, 300. 



