49 



April 14. 1835. 



N. A. Vigors, Esq., in the Chair. 



Mr. Gould, at the request of the Chairman, exhibited, from the 

 collection of the President, the Earl of Derby, a specimen of a spe- 

 cies of Toucan, which he regarded as hitherto undescribed. It be- 

 longs to the same group with the other grooved-billed Toucans, and 

 is consequently referrible to the genus recently proposed by Mr. 

 Gould (Proceedings, Part II. p. 147), under the name of Aulaco- 

 rhynchus. He pointed out the characters which distinguish it from 

 the other species of the genus, and proposed for it the name of 



AuLACORHYNCiius Derbianus. Aul. viridts, suprh in subaureum, 

 ad occiput in cceruleum vergens ; ptilis inferioribus flavescentibus ; 

 rectricibus duabus intermediis brunneo apiculatis ; guld albidd. 



Long. tot. 14-j- — 15 unc. ; rostri, 3-i-; alee, 5 ; caudcs 5. 



Descr. Rostrum robustum, magis quam in congeneribus angu- 

 latum, ad basin (nisi culminis) linea alba cinctum, nigrum in casta- 

 neum anticfe posticeque transiens. Orbitse rufescentes. Pedes satu- 

 rate plumbei. 



Mr. Gould remarked that the colouring of the extremities of the 

 tail-feathers would alone suffice to distinguish from each other the 

 four species at present known in this genus. In Aul. sulcatus the 

 tips of the tail-feathers are not marked by any peculiar colour : in 

 Aul. Derbianus, the two, and in Aul. hcematopygus, the four, inter- 

 mediate tail-feathers are tipped with brown : while in Aul. prasinus 

 the whole of the tail-feathers are tipped with brownish red. 



The exhibition was resumed of the hitherto undescribed Shells 

 contained in the collection of Mr. Cuming. Those brought at the 

 present Meeting under the notice of the Society were accompanied 

 by characters by Mr. G. B. Sowerby. They consisted of the fol- 

 lowing species and varieties of the 



Genus Monoceros. 

 MoNOCEROs iMBRicATUM, var. Costis transversis, confertis, nume- 



rosis, imbricato-squamosis, squamulis ferh ohsoletis : long. 2-2, 



lat. 13 poll. 

 Hab. apud Terra del Fuego. 

 Found on rocks. — G. B. S. 



Monoceros crassilabrttm, var. album. Testd totd ttj,bd: long. 2", 



lat. 1-4. 

 Hab. apud Valparaiso. 

 Found on rocks at low water. — G. B. S. 

 No. XXVIII. Proceedings of the Zoological Society. ^ 



