134 



Tlie beak is daik olive inclin.ing to black, aiid is lighter at its edges 

 and along the culmen. Tlie tarsi are brovvnish black. 



The beautiful semilunar mark \vhich extends across the whole 

 of each side of the neck, consists of silvery white feathers, elevated 

 above the ręst, and abruptly terminated as if clipped by scissors. 



The exhibition was resumed of the new species of Shells con- 

 tained in the collection made by Mr. Cuming on the Western Coast 

 of South America and among the Islands of the South Pacific Ocean. 

 Those exhibited on the present evening vvere accompanied by cha- 

 racters by Mr. G. B, Sowerby, and consisted of the following species, 

 thirty-six in number, of the 



Genus Pleurotoma, 

 •J Pleurotoma maurą. Pleur. testd turritd, acuminatd, Jusco- 

 nigricante ; rnifradibus duodecint, medio tuberculatis, infrdpunc- 

 tato-striatis, superne depressione sinum labii sequente ; canali 

 recurvd : long. 1*9, lat. 0"55 poli. ; long. aperturce 0'8. 

 Hab. ad Insulam Platam Columbiae Occidentalis. 

 Two specimens \vere brought up from a depth of fourteen fathoms 

 in coral sand. — G. B. S. 



Pleurotoma unimaculata. Pleur. testd turritd, acuminatd, 

 albd, anfractūs ultimi dorso Jusco-unimaculato ; anfrnetibus tre- 

 decim, medio tuberculatis, tuberctdis elovgatis, ultimi tuberculis 

 in costellam inferam confluentibus ; aperturd brevi, labio externo 

 expanso, sinu superiore profundo, iriferiore obsoletiore ; labio in- 

 terno superne callum tuberculiformem ęffbrmante: long. I-^, lat. 

 O' 5 poli. ; long. apert. 06. 

 Hab. ad oras Americae Centrah's et Occidentalis. 

 Found in sandy mud, in from eight to sixteen fathoms, at Monte 

 Christe, Guacomayo and Salango. — G. B. S. 



Pleurotoma rosea. Pleur. testd turritd, acuminatd, albidd, 

 antice roseo tinctd ; anfractibus undecim, superne connatis, medio 

 tuberculiferis, tuberculis ovatis, anfractūs ultimi in costellas desi- 

 nentibus ; aperturd brevi, labio externo expanso, sinu superiore 

 profundo, inferiore obsoletiore; canali breviį ręfiexd: long. 1*15, 

 lat. 0*5 poli. 



Hab. ad Salango et ad Montera Christi. 



A delicately coloured species, very likę the lašt in shape. 



Found in sandy mud in from twelve to sixteen fathoms. — G. B. S. 



Pleurotoma Clavulus. Pleur. testd subulatd, leevi, albd, 

 Jusco variegatd, infru incrassatd ; anfractibus novem, suturis con- 

 natis, tdtimo crasso ; aperturd ovali, labio externo incrassato,re- 

 Jlexo , emarginaturd subcirculari posticd ; epidermide tenui: long. 

 0-9, lat. 0-35 poli. 

 Hab. in Sinu Montijae Americse Centralis. 

 Found in sandy mud at a depth of seventeen fathoms. — G. B. S. 



Pleurotoma rudis. Pleur. testd turritd, crassd , rudi, Juscd ; 

 anfractibus decem, viedio coarclatis, suprU iiifrūguc tuberculatis. 



