Zoological Society. 329 



h. From two lateral plates of ossified connective tissue, which 

 in uniting totally enclose the chorda. Acaudate Batrachia, 

 according to m}- own observations. 

 c. From two lateral cartilages which enclose the chorda, and also 

 develope the arches from themselves. Higher Vertebrata. 

 In terminating this Note, I take the liberty of adding that the only 

 information heretofore existing on the subject to which it refers, is 

 tbat contained in the very valuable memoirs by J. Miillev* and 

 Williamson f. 



ZOOLOGICAL SOCIETY. 



March 8, 1859.— John Gould Esq., F.R.S., V.P., in the Chair. 



Description of a new Species of Elanus. By J.Gould, F.R.S. 



This new species is one of the largest members of the genus, and 

 is rendered conspicuous b}"- the entire under surface being white, 

 even the basal half of all the primaries being of this hue, — in which 

 respect, and in its larger size, it materially differs from the E. mela- 

 nopterus, the only bird with which it could be confounded. 



Elanus hypoleucus, Gould. 



Adult. — Face, space over the eye, ear-coverts, all the under sur- 

 face of the body, under tail-coverts, under surface of the tail feathers, 

 and the thighs, pure white ; the under surface of the wing is also 

 pure white ; basal half of the under side of the first six primaries 

 white, slightly speckled with grey, passing into blackish grey ; on 

 their apical halves this grey hue also pervades the under surface 

 of the remaining primaries ; crown of the head, back of the neck, 

 back, and scapularies, deep grey ; on the shoulders a large patch 

 of black ; secondaries and basal half of the primaries deep grey, 

 passing into blackish grey at their tips ; two centre tail feathers 

 grey above, the next on each side grey on their outer margins, the 

 rest white ; cere and legs orange yellow ; bill and nails black. 



Total length, 14 inches ; bill, \\ ; wing, 12| ; tail, fif ; tarsi. If. 



Young. — At apparently about nine months old differs from the 

 adult in having the crown lineated with reddish brown, and a cres- 

 cent of white at the tip of the primaries, secondaries, scapularies, and 

 wing-coverts. 



Hah. Vicinity of Macassar, Celebes. 



Remark. — The above description of the adult is taken from a 

 fine example in the possession of J. H. Gurney, Esq., which, as well 

 as the young bird in the possession of Mr. Gould, was collected by 

 Mr. Wallace. 



April 12, 1859.— Professor Busk, F.R.S., in the Chair. 



Description of a Rare Entozoon from the Stomach of 

 THE DuGONG. By W. Baird, M.D., F.L.S,, &c. 



In the Museum of the College of Surgeons there is a preparation 

 of an Ascaris from the stomach of the Dugong. In dissecting this 



* Vergleichende Anatomie der Myxinoiden. f Phil. Trans. 1850. 



Ann, i^ Mag. N. Hist. Ser. 3. Vol.y. 22 



