114 JOURNAL OF CONCHOLOGY, VOL. lO, NO. 4, OCTOBER, I9OI. 



Hab., Umkomaas, Natal (H. Burnup) ; Kingsmill Islands (Pease); 

 Philippine Island and Sarawak (Brit. Mus.). 



The somewhat worn specimens from Natal have all the rows of 

 nodules blackish, the interstices being yellowish, whereas in the 

 typical form only the first and third rows are black, the second and 

 fourth being white. The Philippine and Bornean examples resemble 

 the South African form. The species is variable not only in colour 

 but also in form and in the acuteness or obtuseness of the nodules, &c. 



24. Marginella burnupi Sowerby. 



Marginella burtiupi Sowerby, Mar. Shells South Africa, appendix, 

 p. 10, pi. 6, fig. 35, 1897. 



M. inconspicua Sowerby, junior (non Sowerby, senior), op. cit., p. 20. 



M. ci?ierea Sowerby (non Jousseaume), op. cit. append., p. 9. 



Hah., Port Elizabeth. 



In this species there are always six columellar folds and sometimes 

 a trace of a seventh, although Mr. Sowerby quotes only five. The 

 two anterior ones are conspicuously larger than the rest. The outer 

 lip is not greatly thickened, and it is finely but not conspicuously 

 denticulate within. The spire is more elevated in some specimens 

 than in others and is far from being "almost flat." The shells 

 referred to M. inconspicua and M. cinerea by Mr. Sowerby are quite 

 distinct from those species, and, in my opinion, are small examples of 

 M. burnupi. Having the types of the two species referred to in the 

 Museum for comparison, I can speak with certainty upon this point. 

 I have already shown {Proc. Zool. Soc, 1890, p. 266) that M. cinerea 

 has only three folds on the columella, not four, as stated by Reeve, 

 and that it occurs at the island of St. Helena. As originally described 

 by Sowerby, M. inconspicua has four folds, and the outer lip is smooth. 

 It appears to have been somewhat tinted and not a pure white shell 

 like burtiupi and cinerea. It is possible that Cystiscus capensis of 

 Stimpson may be the same as the present species, but the description 

 is so meagre that the identification is quite impossible. 



25. Marginella alg-oensis. (PI. I., fig. 4). 



Testa parva, alba, breviter pirifortnis ; spira brevissima, obtusa, vix 

 sup7'a anfractuni ultiniuni elatum ; aufractus ires, celeriter accre- 

 scenfes, sutura conspicua sejuncti ; primus convexus, obtusus, ultintus 

 piriformis, 7nediocriter convexus ; labruvi incrassatuni, usque ad 

 apicem fere p7-oductum, intus Iceve ; columella callo temd induta, 

 plicis parvis circiter 7 insh'ucta ; apertura angusta, antice latior. 

 Longit. 4 vun., lat. 3. 

 Hab., Algoa Bay, Cape Colony. 

 The anterior columellar fold or that which passes round the end of 



the aperture into the outer lip is rather larger than the rest. The 



