SIGARETDS. 41 



shell (concavus) which some autliors have taken for the 

 Helix halioloideus of Linnseiis. Our fig. 4 should represent 

 Javanicus witli closer and crisper sculpture, so as to shew the 

 difference between it and that of Leachii. S. perspectivusy 

 Say. (f. 25), is probably the same species. 



5. L^viGATUS, f. 12, 13, 45? Recluz. — Testa tenuis, quam 

 S. neritoidea Isevior, magis depressa, alba, ovato-subrotunda. 

 — Smoother than S. neritoidea, and more regularly ovate, 

 ultimo anfractu subumbilicato. 



6. Delessertii, f. 14, 20, 21, 22, Recluz. — Testa de- 

 pressa, oblonga, obsolete spiraliter striata, concentrice subun- 

 dulata ; labio externo circa spiram elevato, leviter contracto, 

 superne undulatimproducto. — Of a more oblong oval form, and 

 flatter than the preceding, with the outer lip raised over the 

 spire and slightly contracted near the suture. The upper 

 part of the outer lip is somewhat flexuously produced. 



7. AusTRALis, f. 15, 46, 47, Hanley. — Testa convexius- 

 cida sublgevigata, ovato-oblonga, tenuis, tenuilirata ; spira 

 subimmersa, apice carneo-lutea ; ultimo anfractu ad suturam 

 elevato et leviter contracto. — The specimens in the British 

 Museum differ from each other so much that it is difficult to 

 mark the limits of the species. The specimen figured in the 

 Con. Icon, is distorted, it is inadvertently repeated in our f. 

 15. Our f. 46 and 47 represent the true form. 



8. CuviERiANUS, f. 6, Recluz. — Testa tenuis, albida, de- 

 pressa oblique ovata, post labium internum excavata, regu- 

 lariter tenuiter lirata, apertura ovata, labio externo ad suturam 

 elevato, leviter contracto ; latere ventrali ultimi anfractus 

 angusto ; spira parva, lutea, immersa. — Although expanded 

 and depressed this is not a flat species. It is rather thin and 

 contracted round the suture. 



9. zoNALis, f. 7, Quoy. — Testa oblique oblonga, alba, 

 tenuis, obsolete spiraliter striata, depressa, stramineo late 

 fasciata; anfractibus infra medium subangulatis, ultimo an- 

 fractu latere ventrali angusto ; apertura oblonga, la})io interno 

 tenui. — A rather thin, almost transparent shell with faint 

 spiral stria?. The front part of the body whorl is narrow ; 

 the mouth oval with thin edges. 



10. ARGENTEUS, f. 53, Reeuc. — Testa alba, oblique ovata 

 subdepressa, solidiuscula, post labium internum anguste 



