MARGINELLIDiE. It3 



Marginella, Lamarck. 



Etym. — Diminutive of Margo, a vim. 



Syw.— Volvariiia, Hinds. Eratoidea, Weink. Egouena and 

 Serrata, Jousseaume. Bullata, Jouss. Granula, Jouss. Canal- 

 ispira, Jouss. Balanetta, Jouss. Forcellanella and Microspira, 

 Conr. Pseudomarginella, Carriere, 1881. 



Distr. — 200 sp. Tropical and subtropical ; Caribbsean, West 

 African, Indo-Pacific, etc. Fossil, 75 sp. Cretaceous (?), Eocene — ; 

 United States, Europe, Australia. M. glabella, Linn. (Iv, 56). 



Shell ovately oblong to subcylindrical, smooth, polished, 

 sometimes longitudinally ribbed ; spire short-conical or con- 

 cealed ; aperture narrow, elongated, obtuse or truncated in front ; 

 columella plicate; outer lip with a thick marginal varix, its inner 

 margin smooth or crenulated. 



GLABEiiLA, Swainson. Yolutiform, spire more or less conic, 

 well developed, usually longitudinally plaited about the shoulder 

 of the body-whorl ; pillar with distinct basal plaits ; lip thick, 

 toothed or crenate, rarely smooth within. M. Adansonii, Kiener 

 (Iv, 57). 



PRUNUM, H. and A. Adams. Shell smooth, oval, spire slightly 

 prominent ; outer lip thick, unarmed, inner lip frequentl}^ forming 

 a callous deposit ; color light gray or yellowish gray, usually 

 without distinct bands or spots ; exterior lip-margin sometimes 

 orange-brown. M. marginata, Born (Iv, 59, 60). 



CRYPTOSPiRA, Hinds. Shell swollen, smooth, spire very short, 

 nearly concealed ; columella five- or six-plaited ; outer lip thick- 

 ened, smooth within ; color gray or ^^ellowish olivaceous, usually 

 without bands, sometimes interruptedly banded or strigate. 

 Nearly related to Prunum, but differs in having a shorter spire, 

 less callous deposit and more columellar teeth or plaits. M. 

 elegans, Gmel. (Iv, 58). 



VOLUTELLA, Swainson. Bulliform, ovate-oblong ; spire de- 

 pressed ; pillar with four oblique plaits at the fore-part, lip smooth 

 within. M. bullata, Born (Iv, 61). 



PERSicuLA, Schum. Shell Bulliform, spire depressed or sunken ; 

 usuall}^ banded or spotted ; aperture long, the outer lip generally 

 denticulated within, with a posterior channel, inner lip with a 

 callosity posteriorly, four plaits anteriorly, with smaller ones 

 behind them, becoming obsolete. M. persicula, Linn. (Iv, 62). 



GiBBERULA, Swaiuson. Shell suboval ; spire slightly promi- 

 nent, outer lip posteriorly dilated and gibbous, not denticulated. 

 A group of small species differing from Persicula in the spire 

 being slightly prominent instead of sunken. M. miliaria, Linn. 



CLOSIA, Gray. Spire involute ; lip thick, usually dentate 

 within ; columella heavily incrusted with callus, the two lower 

 plaits very prominent, two upper ones not so prominent, above 

 them there are sometimes false folds or transverse ridges as in 



