368 Mr. Cosmo Melvill on the 



The order Fasciolariincey as at present understood, 

 embraces, altogether, species which possess these plaits, 

 excepting the Fusi veri^ Clavella, Taron^ and BuccinofusuSy 

 genera, at the present day, associated with Fasciolaria in 

 consequence of the similarity of dentition. Of this we 

 shall speak shortly, as also of the animal. The Opercula 

 are similar throughout, being horny, oblique, with nucleus 

 apical. 



To return to the plaiting of the columella, Latirus 

 Syractisanus (L.), Peristernia Brazieri (Angas) and one or 

 two others do not possess them, so far as is discernible ; nor 

 Peristernia nassoides (Reeve) a species abnormal in many 

 ways. Owing, however, to a considerable amount of deposit 

 of enamel on the columellar side of the labrum, it is probable 

 the plaits get covered over and so obliterated, especially 

 just at the orifice. This is certainly the case with the type 

 of the genus L. gibbuhis (GmeL). 



Reeve* well remarks on the oblique tendency of these 

 plaits in the true Fasciolariince {e.g.y F, trapezium, salnio\ 

 also noticeable, but to a lesser extent, in the Latiri and 

 Peristerniince, this compared with the straighter, more promi- 

 nent convolutions of the true Turbinellidce. 



(III.) Existing Monographs of the genera. — These genera 

 have been monographed by Kiener, Reeve, and Kobelt in 

 Raster's Conchy lien-Cabinet, the latter being the most 

 perfect in arrangement of the three ; Lovell Reeve, for 

 instance, having taken the whole group in Vol. IV. Conch. 

 Icon., 1847, under the name Turbinella (Lam.) includes not 

 only T. pyrum and its allies, as was natural at the time of 

 writing, but also so distinct a form as Cuma tectum (Gray) ! 

 His figures were produced with rare fidelity and unsurpassed 

 execution by the late Mr. Sowerby, and many species were 

 then described by Mr. Reeve for the first time. 



* Conch, i Icon* Vol. IV. Turbinella, prefatory remarks. 



