53 



79. sapotilla, Hinds. 



80. sarda, Kiener. 



81. Saulia3, Sow. 



82. scripta, Hinds. 



83. splendens, Humph. 



84. strigata, Chemn. 



85. tseniata, Sow. 



86. tessellata, Lam. 



87. tricincta, Hinds. 



88. triticea, Soto. 



89. undulata(Fi3Z«^tt),Ch, 



90. varia, Sow. 



91. vitrea, Hinds. 



92. zonata, Kiener. 



Marginella nubeculata. 

 ^. Cuming. Esq. 



Figure. 

 Plate 1. Fig. 1. — From the collection of 



Genus 5. RINGICULA, Beshayes. 



Animal ; mihiown. 



Shell ; small, globose, very solid, sinuated at the base, spire short, 

 sharjjly acuminated, columella short, with a plait-lihe callosity 

 at the upper part, and two strong plaits beneath ; aperture 

 small ; lip remarkably thickened. 



The genus Ringicula was instituted by M. Deshayes for the reception of 

 a solid marine shell, about the size of a small pea, the fossil analogue of 

 wliich had been erroneously placed by Lamarck among the fresh-water, 

 or rather ampliibious, Auricidce. It was first discovered in a Hving state 

 by M. Menard de la Grove in the guK of Tarentum, and, upon noticing its 

 affuiity with the fossil Auricida ringens of Lamarck, he at once observed 

 that from its marine nature and sinuated aperture, the fossil species to 

 which it was related had been referred to the wrong genus. The characters 

 which liis shell exliibited were more intimately aUied to Marginella, and he 

 named it accordingly Marginella auriculata. M. Deshayes, however, has 

 justly observed that its general form, and the disposition of the plaits, are 

 not Hke those of Marginella, though closely allied to them, and I fully 

 concur in the course he has adopted. It is a small white porcellanous 

 shell, of very solid growth, the spire of wliich, though short, is sharply 

 acuminated ; the columella is peculiarly characterized by a rude plait -like 

 callosity round the upper part, and two very prominent winding plaits 

 beneath ; there is a broad sinus at the base of the sheU, and the Hp is very 

 considerably thickened. The following is the only recent species at present 

 known. 



Figicre. 



Ringicula auriculata. Plate L Pig. 2. (Magnified). — From tlie collec- 

 tion of H. Cuming, Esq. 



