49 



AprU 14. 1835. 



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



Mr. Gould, at the request of tlie Chairman, exhibited, frora the 

 coUection 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 šame group with the other grooved-billed Toucans, and 

 is conseąuently 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 



AuLAcoRHYNCHUs Derbianus. Aul. viridis, suprcL in subaureum, 

 ad occiput in ccerulei/m vergens ; ptilis inferioribus flavescentibus ; 

 rectricibus duabus intermediis brunneo apiculatis ; guld albidd. 



Long. tot. 14-j- — 15 unc. ; rostri, 3-I-; ala, 5 ; cauda: 5. 



Descr. Rostrum robustum, magis quam in congeneribus angu- 

 latum, ad basin (nisi culminis) linež alba einctum, nigrum in casta- 

 neum anticė posticėque transiens. Orbitse rufescentes. Pedes satu- 

 ratė plumbei. 



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

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

 four species at present knovNTi in this genus. In Atil. suhatiis the 

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

 Aul. Derbianus, the tAVO, and in Atil. htEtnatopygus, the four, inter- 

 mediate tail-feathers are tipped with brovrn : ^hile 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. 



MoxocEROs iMBRiCATUM, vaT. Costis trūTisversis, confertis, nume- 

 rosis, imbricato-squamosis, squamuUs feri obsoletis : long. 2"2, 

 lat. IS poli. 



Hab. apud Terra del Fuego. 



Found on rocks. — G. B. S. 



Monoceros crassilabrum, var. album. Testd totd ajhd: long. 2', 



lat. 1-4. 

 Hab. apud Valparaiso. 

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

 No. XX^'III. Proceedings of the Zoological Sociktt. « 



