384 



Differing from M. ccerulescens in the spire being more produced 

 and in the colouring, wliich is bufP, with obscure purplish bands. 



41. Marginella cincta (pi. Ixxvii, f. 165, 166.), Kiener, 

 Sp. gen. coq. viv., p. 21. 



M. sub-ovali, postice sub-angulata, varice tumido, aurantiaco 

 latera spiram et terminum anticum colligente ; spira producta, 

 anfractibus rotundatis ; apertura angusta ; columella callosa, late 

 expansa, plicis quatuor, quarum duabus anticis incrassatis, labio 

 externo Isevi, crasso, postice emarginato. 



More angular than 31. bivaricosa, encircled with a bright orange 

 callous margin, which surrounds the spire ajid is not doubled ou 

 the right side. 



Mr. Cuming's Collection ; locality unknosm, 



42. Mae-ginella bivaricosa (pi. Ixxvii, f. 171, 172.), Lam. 

 Vol. margiuata. Born, Mus. t. 9. f. 5. 6. 



M. ovali ; varice tumido, uno latere duplicato, latera, spirse partem, 

 et terminum anticum colligente; spira producta anfractibus ro- 

 tundatis ; apertura angusta ; columeDa callosa, late expansa, plicis 

 quatuor ; labio externo crasso, postice emarginato. 



Eemarkable for the manner in which the lips of the aperture 

 are extended and tliickened round the sides, and at the back of the 

 shell, nearly enveloping the spire, and forming a double ridge oil 

 the right side. 



From Senegal. 



43. Marginella amygdala (pi. Ixxvii. f. 160, 161, 162.), 

 Kiener, Sp. gen. coq. viv. 



M. ovali, ventricosa, pallide cinerea, ad latera et antice tumida, 

 fusco marginata ; spira conica, anfractibus albo-marginatis ; aper- 

 tura intiis fusca, antice sub-dilatata ; columella late ex}>ansa, alba, 

 plicis quatuor, quarum duabus anticis validis, spiralibus; labio 

 externo albo, crasso, versus apicem elevato, antice sub-acuto, pro- 

 ducto. Yariat pallide fulva, minus ventricosa ; variat etiam cinereo- 

 fusca. 



Pigures 160-1, may be taken to represent the typical form of 

 this shell. Pig. 162, represents a rather young specimen of a 

 less ventricose variety in the Collection of Mr. Cuming, who also 

 possesses a pale fawn-coloured variety of similar form. 



From Senegal. 



