Genus Latirus, 375 



same time the Ptychatracti type : — P.ligaius(M.\^Q\s),Fusus 

 olim^ were moved by Troschel to the TurbinellidcB^ in 

 company with Meyeria (Dkr.) It is to this latter genus 

 that the Latirus albus (Jeffreys) belongs, known only to us 

 by the figure in " Depths of the Sea," by Wyville Thomson, 

 from the Shetland Isles. The shell is apparently of 

 Latirtis form, and the plicae on the columella are present. 

 It is similar to Peristernia scabrosa (Reeve), with few 

 longitudinal ribs. Shell of thin substance, but the dentition 

 proves its alliance with the Melongence, 



In i^y^yFusus Berniciensis{YL.\ng),un6.Qr iho. generic name 

 of Boreofiisus (G. O. Sars.) was proved to have the identical 

 lingual dentition as Latirus,d.nd though in the form of its shell 

 approximating more nearly the NepUmea, with which it had 

 been formerly associated, must in future occupy a place in 

 this family. In this shell there are no plicae to the columella, 

 the form is ventricosely fusiform, pale pink, with brown 

 epidermis more or less omnipresent, lightly concentrically 

 ridged, every third ridge being more prominent, whorls 

 somewhat effuse, canal slightly inclined, mouth ovate — a 

 rare inhabitant of the North of England and Norwegian 

 Seas. For a full description vide Sars. MolL Arct. Norweg. 

 p. 278, pi. xiv., fig. 2. Plate of radula^ pi. x, fig. 26, and 

 also vide Jeffreys. 



The Rev. A. H. Cooke has just informed me that Fascio- 

 laria lignaria (IS) = Tarentina (Gmel.) is more a Latirus 

 than a Fasciolaria by its dentition. I had thought that, 

 perhaps, the whole might be merged in Fasciolaria^ as every 

 gradation, between the large F. gigantea (Kien.), which 

 measures sometimes, as already noticed, over two feet in 

 length, to the small Peristernia of 10 mm. may be traced, 

 but I am assured by Mr. Cooke that Mr. Gwatkin and he 

 have studied the radulae of many members of this group, 

 and that not only do all the Fasciolarice \vj\\h the exception 

 oi F. iignaria) vQidAn the self-same characteristics, but the 



