BY C. W. DE VIS. 439 



traits of our fossil. As before intimated, it shows a deltoid ridge 

 running parallel with the culmen at a distance of two milliins. on 

 its posterior face (PL xxiv., fig. lb C). 



The strong differential characters of this humerus render it 

 impossible to form any decided opinion as to the bird's relations 

 with recent genera, but after much consideration the writer is in- 

 clined to think that on the whole it favoursiVi'saeJMSjthe little crested 

 eagle, more than any other. Necrastur was evidently a highly 

 specialised member of its family, and if, from the extended surface 

 of articulation, allowing a wider sweep of wing in the same plane, 

 and from increased muscular room and superior leverage obtained 

 on and from the prismatic form of the shaft, we may infer unusual 

 faculties in flight, a word significant of these to some extent — 

 alacer — may be allowed to stand as the second term of its name. 



Distal end of an ulna — a bone having the characters of a falco- 

 nine ulna and corresponding fairly in size with the preceding 

 humerus may be placed with it until it can be shown to have 

 belonged to a different hawk. 



LOBIVANELLUS Sp. 



The remains of a very fragile distal end of a tarsometatarse 

 attest the early existence of this genus. While still perfect the 

 fossil was clearly identified generically, but before its specific 

 characters could be ascertained, the cover of a book, inadvertently 

 allowed to rest upon it, crushed it beyond the possibility of resto- 

 ration for descriptive purposes. 



Tribonyx effluxus, n.s. 



The bone figured [P.L.S.N.S.W. Vol. iii. (2), Pt. 3, pi. 35, fig. 9b] 

 as the distal end of the humerus of a Jfulica (F. prior) proves not 

 to belong to that genus, but to Tribonyx. The error arose from 

 an inadvertence for which no excuse can be offered — due attention 

 was not given to the shape of the radial trochlea as it exists in 

 the fossil and in Tribonyx, and undergoes change in Fulica. In 

 Fulica, Gallinula, and Porphyrio, the antero-interior side of the 

 trochlea is emarginated, and the emargination, aided by a slight 



