TIARA i^abella. 

 Fawn coloured 31itre. 



Order Zoophaga. Family Voluticlce. 



Sub-Family Mitrianae. (G. Mitra. Auct.) 



Generic Character. 



Animal 



Shell turrited, fusiform, the base contracted and slightly recurved ; 

 pillar v,'\th 4-5 plaits, the upper plait sulcated : outer lip 

 smooth, or entire. Aperture narrow, striated within, and pre- 

 senting an internal groove at its upper extremity. Nobis. 

 Types of Foim. 

 1, M. Corrugata 2, Regina. 3, Sanguisiiga. 4, Microzonias. 

 5, Isabella. 



Specific Character. 

 Ti. (Ty. 5) Shell slender, faion coloured, unspotted, marked by 

 slender croicded, transverse, convex ribs, the interstices deeply 

 cancellated ; inner lipicanting, outer lip crenately undulate; 

 pillar 5 plaited. 



It is highly probable that the Mitres, like some other carni- 

 vorous marine animals, seek their prey, and habitually re- 

 side, in the deep recesses of the ocean. Instances are 

 recorded of individuals having been brought up from great 

 depths ; and notwithstanding the number of species, of 

 which we already know near 150, very few are common. 



This genus, in short, is now become too overloaded, even 

 for the purposes of artificial arrangement : but we refrained 

 from characterizing any other group than Conohelix^ until 

 we analized the remainder. Tiara appears to be the 

 second, or sub-typical group. The subordinate section, or 

 type of form, represented by T. Isabella, includes several 

 little known shells, all marked by delicate transverse ribs 

 and longitudinal striae : the outer lip is not strictly toothed 

 or crenated, but is merely undulated by the external 

 sculpture : this subordinate group in Tiara, is aberrant : 

 all the species whose habitat we know, have come from the 

 Pacific Ocean. 



Tiara Isabella is a shell of the greatest rarity. Our 

 drawing was made from a specimen (presumed unique) sold 

 at the Bligh Sale for 3/, 3*-. It was stated to come 

 from New Holland, and is now in (he Manchester Museum. 



T I A 11 A sulcata. 

 Sulcated Mitre. 



Tiara. (Ty. 5.) Shell marked by distinct, carinated, remote transverse 

 ribs, theinterstices concave : pillar thi-ee plaited, epidermis broicn. 

 For this new and very distinct species, we are indebted 

 to Mr. Bulwar. It was collected on the Pacific side of the 

 American Isthmus. The central line indicates the true 

 size of our specimen. 

 Mitrana?, PI. o. 



