377 



longitudinalitcr ornata; spira brevi, anfractibus subrotunclatis ; 

 columella callosa, expansa, quadriplicata ; labio cxterno crasso, 

 intus leviter creuulato^ ad marginem externum lineatim nigro 

 maculato. 



Oval, rather ventricose, smooth, of a pale fawn colour, marked 

 by distant undulating lines. The spire is short, the aperture 

 large ; the columellar lip thickened and spread over the front of 

 the last whorl. The outer margin of the reflected lip is marked 

 by groups of strong, blackish lines. 



Common ; from Gambia, The reversed specimen (f. 18), is from 

 Mr. Cuming's collection. 



14. Marginella helmatina (pi. Ixxv. f. 38, 39), Rang, 

 Guerin, Mag. de zool. Kiener, Sp. gen. coq. Marginella, p. 10. 



M. ovali, hevi, griseo maculata, fasciis tribus, nigrescentibus 

 interruptis cincta; spira brevi, anfractibus paucis, rotundatis; 

 apertura elongata ; columella tenui, expansa, quadripHcata ; labio 

 externo intus minute crenulato; pone marginem externum sub- 

 canalifero. 



Much smaller and more ventricose than M. limhata, having the 

 columellar lip thinly spread over a portion of the last whorl, and a 

 very narrow groove behind the reflected lip. The colour is 

 spotted grey. From the River Gambia. 



15. Mauginella Cumingii (pi. Ixxiv. f. 33, 34, 35.), Tetit, 

 Eevue Zoologique ? 



M. ovali, Isevi, ventricosa, grisea, creberrime seriatim punctata, 

 maculis nigrescentibus trifasciata, spira brevi, obtusa; apertura 

 elongata, columella sub-callosa, paululum expansa, quadriplicata; 

 labio externo crasso, rotundato, intus regulariter crenulato, pone 

 margine acuto, valide canalifero. 



Much more ventricose than M. helmatina, with the outer lip 

 much thicker, the reflected margin sharper, and a deeper groove 

 behind it. The variety having the very broad outer lip (fig. 33.) 

 is in the collection of Mr. Gaskoin ; the others are Mr. Cuming's. 

 Prom Senegal. 



16. Marginella Petitii (pi. Ixxiv. f. 31, 32.), Guerin, Mag. 

 de zool. 



M. ovali, Isevi, ventricosa, pallida, grisea rubescente leviter fas- 

 ciatim punctata; spira brevi, anfractibus paucis, rotundato-sub- 



