438 Prof. II . G. Seeley on the 



there forming a corresponding white projection ; the sinus 

 filled internally with brown-black, which tint also prevails on 

 the costa beyond it ; a dark central spot ; veins towards the 

 hind margin paler, with black spots in the intervals ; fringe 

 concolorous. Hind wings whitish basewards, thickly dusted 

 with fuscous along the inner margin, and with a denticulated, 

 dark, pale-edged band at two thirds, beyond which the border 

 is dark fuscous ; fringe as in fore wing. Head, thorax, and 

 abdomen ochreous, sprinkled with fuscous ; palpi, anal seg- 

 ments of abdomen, and its sides brown-black ; tufts of the 

 legs in male the same ; anal tuft of male reddish brown. 



Expanse of wings 24 millim. 



One male, one female, from Natal. 



[To be continued.] 



XLVI. — On the Shoulder -girdle in Cretaceous Ornithosauria. 

 By Professor H. G. Seeley, F.R.S., &c, King's College, 

 London. 



In 1882* Professor Marsh published the remarkable discovery 

 that the American Cretaceous Ornithosaurs are characterized 

 by the anchylosis of the anterior thoracic vertebra? into a 

 structure resembling a sacrum, to which the scapula? are said 

 to articulate. No figure has been given of this singular con- 

 dition of the shoulder-girdle. But it appears to me probable 

 that the character is common to all the Cretaceous Ornitho- 

 cheiroidea, and is a distinctive condition of that ordinal group. 

 Sir Richard Owen in 1859 published in the ' Transactions 

 of the Palasontographical Society,' pi. iv. figs. 6, 7, 8, figures 

 of a symmetrical bone from the Cambridge Greensand which 

 was interpreted as probably frontal. The discovery of a more 

 perfect specimen did not elucidate its nature; and in the 

 4 Ornithosauria,' 8vo, 1870, p. 88, I placed over my account 

 of it the twofold description " ? Neural Arch of Sacral Ver- 

 tebra, ? Vomer," remarking that there is no proof that it is a 

 skull-bone, but that if from the skull it might have been the 

 vomer. This specimen I drew in pi. xii. figs. 15, 16. I go 

 on to remark that " A specimen collected by the Rev. T. G. 

 Bonney is preserved on the sacral side of a left os innomi- 

 natum with the keel downward. It appears to show asutural 



* '• Wings, of Fierodact/vle. c ," Am. Jouni. Sci., April ]8>-2, p. 2.">4. 



