ON THE ANATOMY OF PELECANOIDES. 521 
85. NOTES ON THE ANATOMY OF PELECANOIDES 
(PUFFINURIA) URINATRIX.* 
Ir being my good fortune to have had the Procellariids which were 
preserved in spirit during the ‘‘ Challenger” Expedition placed in my 
hands, I take the present opportunity to describe some points in the 
anatomy of Pelecanoides urinatriz, one of the most interesting of the 
species. 
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 communicationf 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. Reasons for my change-of opinion will be found in what here 
follows. 
The Procellariide may be divided into the Storm-Petrels or 
Thalassidromine, and the true Petrels or Gistrelatine, the former 
differing from the latter in possessing the accessory semitendinosus 
muscle. Pelecanoides urinatriz lacking this muscle must be placed 
with the Cstrelatine. The semitendinosus is present in all the 
Procellariide, Pelecanoides included. ‘The same may be said of the 
femoro-caudal: but with reference to the accessory femoro-caudal 
Pelecanoides differs from all its allies, as far as my experience goes, 
except Bulweria columbina, in not possessing it. ; 
Tn all the genera of Cistrelatine with which I am acquainted, in- 
cluding Diomedea, Ci strelata, Daption, Pagodroma, Bulweria, Ossifraga, 
Thalasseca, Puffinus, and Prion, the ambiens muscle is present, but 
it is wanting in Pelecanoides, as it is in Thalassidroma fregatat 
amongst the Thalassidrominz. 3 
A peculiarity in the arrangement of the vessels of the groin is 
constant in Pelecanoides. In birds generally the femoral vein on 
entering the thigh traverses obliquely downwards and forwards to 
* [This paper was never published, but having found it in its present state 
amongst the MS. papers of the author, I have thought it worth while to print it here, 
as, though manifestly incomplete, it contains one or two important facts. It was 
written during the spring or early summer of 1879.—Eb.] 
+ “ Proceedings of the Zoological Society,” 1874, p.117. (Supra, p. 214.) 
t [The birds so called here and elsewhere (supra, pp. 175 and 204) are, as I have 
lately shown (“ Proceedings of the Zoological Society,’ 1881, June 21st), specimens 
of the Thalassidroma nereis of Gould, which I have made the type of a new genus, 
Garrodia, in memory of the author of these papers.—Eb. | 
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