﻿AMBERLEYA. 



293 



Relations and Distribution. — This form is very rare, and would seem to 

 represent the most extreme phase of the large and diverse series which I have 

 ventured to group under Amberleya. Both specimens occur in the Murchisonm- 

 zone, the smaller one at Bradford Abbas, the larger one in the Pisolite at 

 Longfords. 



PL XXIII, fig. 10, represents a specimen from the Murchisonse-zone of 

 Stoford, which seems in some way to combine the characters of Amb. turbinoides 

 and Amb. elongata. The specimen is unique, and I have not ventured to 

 name it. 



226. ? Amberleya (Turbo) Dundriensis, Tawney, 1873. Plate XXIV, tig. 11. 



1873. Turbo Dundeiensis, Tawney. Dundry Gasteropoda, p. 30 (22), pi. ii, 



fig. 2. 



Description. — " Shell elongate, acutely conical. Whorls seven, angular, 

 outline slightly convex above the keel, and then bending in towards a deep 

 suture. Aperture angular, trapezoidal." The spiral angle is about 50°. The 

 ornaments are fine ; it is uncertain whether there are two or three spirals above 

 the keel, the one nearest the suture having the most distinct nodulations ; axial 

 strise conspicuous throughout. About nine spirals in the base. 



Relations and Distribution. — Mr. Tawney refers to several shells from the Lias 

 which come near this shape, such as Trochus imbricatus-Suecicus, Quenstedt ; 

 T. concinnus, Moore ; T. Gaudryanus, d'Orbigny. He further says, " This and 

 allied forms might form a distinct genus ; they seem to differ from the recent 

 Turbo" 



There can be no doubt that " Turbo" Dund.riensis takes the place at Dundry 

 of Purpurina {Eucycloidea) bianor, d'Orb., already noticed in this Monograph. 1 



At that time I was not aware that several of d'Orbigny 's Purpurinas were 

 really Amberleyas, and that the Purpurina-like mouth in many cases was merely 

 a stage in the development of Amberleya. I should be now disposed, therefore, 

 to withdraw Eucycloidea from its supposed relationship to Purpurina. "Whether 

 Eucycloidea should be retained or merged in Amberleya is at present uncertain. 

 Since Amberleya is likely to become too large and comprehensive, Eucycloidea 

 might, perhaps, be retained as a sub-genus for shells of this class. 



1 Page 95, Purpurina {Eucycloidea) bianor, d'Orb, PI. II, figs. 5 a — h. 



