﻿M A R Ct A R I T A. 



Plate I. 



(ieims MARGARITA. Leach. 



Testa siihfrorJurfi'rmh, nl heliclfonnis, inius ct nub 

 tetjuiiu'iiiiun cjlenmin iiiargariiacea, interdum 

 umhih'cata, interdHin claitsa. Apertura magna, 

 simplex. Operculmn^ conicmn, siihovatuni, fatici- 

 spirale. 



Shell trochus- or lielix-sliapecl, pearly inside and 

 beneath the external tegument, sometimes um- 

 bilieated, sometimes closed. Aperture large, 

 simple. Operculum horny, subovatc, few- 

 whorled. 



This genus consists of a few shells that have been 

 grouped together, as having some affinities, but no 

 very definite uniting characters. In the work by 

 Messrs. Adams they are separated into two genera, 

 and other species have been added to each. In the 

 original genus there are umbilicated and non-nmbi- 

 licated examples : the former are allowed in that 

 work to retain the name now used, while the latter 

 are named ' Photinula.' This plate having been 

 published in a former number, the writer now 

 completes the monograph, including both sections, 

 as left by his late father, in the Conchological 

 Illustrations, with a few additions from specimens in 

 the collection of the British Museum. 



Species 1. (Fig. a, h, Mns. Brit.) 



Maug.^RITA r.Mr.lLICALls. .U-;r. /.•,•.•/(( mmind, tenui 

 lavigatd, /"In!, <./,//./»,-■ ,• ,i„ihli;,-n latissimo, apcr- 

 turd maxiiini, i-/.//y/'"", mtn^ sjilnidnlr i ndcseoifi : 

 ultimo anfraclu hdo, oh^rnri^^hnr ,M„ji<hdo. 



The ummlical Makgaeita. Shell large, thin, smooth, 

 fulvous, oblique, umbilicus very broad, aperture 

 very large, oblique, splendidly iridescent within ; 

 last whorl broad, very obscurely angular. 



Bkodekip. Sowerby Con. 111., p. 13. 



Uah. ? 



Species -. (Mns. Brit.) 



SIakgarita uxpulata. Mar. testd fiihd, parvd, de- 

 pressd, spiralifer striata, ad svturam undulatd; 

 idtiiiio anfractu lata ; apertura magiut, obliqud ; 

 umhilico augusto, alho. 



The wavy Margarita. Shell fulvous, small, de- 

 pressed, spirally striated, waved at the suture ; 

 last whorl broad ; aperture large, oblique ; 

 umbilicus narrow, white. 



Sowerby. Mai. and Conch. Mag. Conch. 111. Species 

 12, f. 4. 



Hah. Massachusetts Bay. 



Species 3. (Mus. Brit.) 



Margarita sulcata. ]\[ar. testa alhd, depressd suUus 

 Iwvi, supra spiraliter liratd ; apertura lata ; vm- 

 hilieo hit", sidii-arinato. 



The Gkihivki' Mai^haeita. Shell white, depressed, 

 smooth buneat h, spirally ridged above ; aperture 

 broad ; umbilicus broad, subcarinated. 



SowERBT. Mai. and Conch. Mag. p. 26. 



UaJ,. ? 



Species 4. (Fig. a. h. Mns. Brit.) 



Margarita tsniata. Mar. testa tfccheformi, fidvd, 

 fasciis ruhris tmniatd, leevigatd ; spird conicd, 

 anfradibus quinis, rapide crescentihus, ultimo 

 magno ; apertura magna, cohimelld albd, crassd 

 obliqud, infra suhcuiieatd. 



The eibdanded Margarita. Shell trochus-shaped, 

 fulvous, banded with red stripes, smooth, spire 

 conical, whorls five, rapidly increased, last large ; 

 aperture large, columella white, thick, oblique, 

 slightly cuneate below. 



Sowerby. Conch. lUus. Species 1, fig. 2. 



llab. Falkland Islands. 



Species 5. (Fig. a, h, Mus. Brit.) 



Margarita violacea. Mar. testa crassiusculd, rubra, 

 obliqud, la;vi, non tmibilicatd; anfradibus trinis, 

 rapide crescentibus ; ultimo magno, subdepresso, 

 infra plaiiiuseula ; apertura viagnd, obliqud. 



The violet Margarita. Shell rather thick, red, 

 oblique, smooth, not umbilicated ; whorls three, 

 rapidly enlarged ; last large, somewhat depressed, 

 rather flattened below ; aperture large, oblique. 



King. Zool. Journ. Vol. V. p. 346. 



Hab. ? 



