Z()X)logical Society. 361 



style and character of its sculpture, that a specimen or two of differ- 

 ent ages seem all that is necessary to exhibit a complete specific 

 connection between them ; it has however been demonstrated by the 

 researches of two gentlemen of perhaps the greatest practical expe- 

 rience, Mr. Cuming and Mr. Hinds, that no species of shell common 

 to the western coast of South America has ever been discovered on 

 the coast of Africa. 



Ranella ponderosa. Ran. testd acuminato-ovatd, crassd, pon^ 

 derosd, varicihus valde prominentihus ; anfractibus superne leviter 

 angulatis, granulorum sericbus cingulatis, alternis granulis gran- 

 dibus, bipartitis ; rubido-fuscd, lutescente ; columella granulatd et 

 rugosd; canali brevi, subrecurvo ; labro plano-incrassatOf granu- 

 lato, superne sinuato. 

 Conch. Icon., Ranella, pi. 3. f. 14. 



Hab. ? 



The sculpture of this shell approaches very nearly to that of the 

 Ranella ccdata ; it only requires however a slight examination of the 

 specimens before me in different stages of growth, to see that they 

 are specifically distinct. 



Ranella nobilis. Ran. testd oblong o-ov aid, depressd, crassius- 

 culd ; spird acuminatd, varicibus angustis, radiatim stellatis ; an- 

 fractibus granuloso-liratis, prcecipue super varices, in medio tuber- 

 culatis, anfractu ultimo tuberculorum seriebus duabus armato ; 

 albidd, fusees cente subtiliter maculosd ; columelld fortiter rugosd; 

 aperturd oblongd, utrinque canal iculatd, fauce alba ; labro fortiter 

 rugoso. 

 Conch. Icon., Ranella, pi. 4. f. 16. 



Hab. ? 



The form of this noble species is somewhat intermediate between 

 that of the Ranella pulchrtti or " Finned Frog," and the ordinary type 

 of the genus, the varices exhibiting an indication of that peculiar 

 star-like radiation common to the former, whilst the aperture is of 

 an oblong canaliculated form, with the wrinkled lip and columella 

 of the latter. The sculpture most resembles that of the Ranella fo- 

 liata. 



Ranella coriacea. Ran. testd oblongo-ovatd, depressiusculd, 

 spird subobtusd, varicibus rotundatis ; anfractibus undique creber- 

 rime granulatis, transversim cosfatis, costis latis, interdum subobso- 

 letis, irregular iter tumido-nodosis ; aurantio-fuscescente ; columelld 

 sparsim rugosd; aperturd ovatd, utrinque leviter sinuatd ; labro 

 intus radiatim denticulato. 

 Conch. Icon., Ranella, pi. 6. f. 26. 



Hab. ? 



This interesting species, which Mr. Cuming possesses in different 

 stages of growth, is the shell figured by Mr. G. B. Sowerby, jun., in 

 the ' Conchological Illustrations ' as a variety of his Ranella scrobi- 

 culator {Triton scrobiculaior, Lamarck and others) ; I think, how- 

 ever, with M. Deshayes, that it is '* une coquille qui me paratt tou- 

 jours dijjhente ; fen ai vu plusieurs exemplaires et plusieurs figures, 

 Ann. 5f Mag. N. Hist. Vol. xv. 2 C 



