402 Zoological Society, 



of specific separation, although the two extremes differ considerably 

 in general appearance. 



Helicina similis, Sow. jun., Thes. Conch. Hel. testa H. politae 



simillimd, sed impolitd, concentrice leviter striatd, fused. 

 Hab. apud insulam Guadaloup. Mus. Cuming. 



Helicina parva, Sow. jun., Thes. Conch, f. 82. Hel. testd H. 



politse simillimd, sed magis rotundatd, labio externo minime de- 



presso. 

 Hab. Argao, ins. Zebu. H. Cuming legit. 



Found on leaves of bushes, and differs only from the smaller va- 

 rieties of H. polita in being globular, and having the outer lip not at 

 all depressed above. 



Helicina Guadaloupensis, Sow. jun., Thes. Conch, f. 65, 66. 



Hel. testd Icevi, depressd, subangulatd, concentrice leviter striatd ; 



columelld ad basin subnodosd ; labio externo crasso, reflexo ; an- 



fractibus gradatim crescentibus, supra infraque subventricosis ; 



operculo fusco. 

 Hab. apud insulam Guadaloup. Mus. H. Cuming. 

 Var. a. T. rubra, lutescente, majori. Alt. *35 ; lat. '60. 

 Var. b. T. pallide brunned, minori. Alt. "20; lat. "35. 



A memoir on the family of Touracoos, by Dr. E. Riippell, was next 

 read. In this memoir the author characterizes the following two 

 new species of the genus Chizcerhis from Abyssinia : — 



Chiz^erhis personata. Chi. regione ophthalmicd, gents, mento 

 et guld, pennis denudatis, cute nigricante, vibrissis brevissimis 

 vestita ; pileo crista plicatilis, plumis laxis, elongatis, colore mu- 

 rino ; nuchd, regione paroticd, juguloque albidis, jugulo et pectore 

 viridi-glaucis ; abdomine et tibiis rufo-cervinis ; auchenio, dor so et 

 alis casio-umbrinis, rectricibus olivaceis ; caudd elongatd, subrotun- 

 datd, supra cinered, infra luteo-virenti, rostro et pedibus nigris ; 

 iride albo-cinerascente. 

 The most characteristic peculiarity in the present species, observes 

 Dr. Riippell, consists in the absence of feathers on the face and 

 throat, the skin of these parts presenting only small scattered hairs, 

 and apparently being of a blackish purple colour. The feathers of the 

 upper surface of the head are elongated, and have the plumelets soft 

 and flowing ; they no doubt are erectile, and form a crest at the will 

 of the bird. The two sexes agree perfectly, both in size and colour- 

 ing. The dimensions in French measure are as follow : — 



in. lin. 

 Total length from the tip of the beak to the tip of tail .19 



Tail 10 



Length of the beak, measuring along the upper curvature 1 1 



Greatest height of the two mandibles 7 \ 



Length of the wing from the bend to the extremity of 1 o q 

 the fourth wing-feather, which is the longest . . . . / 



Length of the tarsus 1 6 



Length of the middle toe, including the nail 1 10 



