﻿AMBERLEYA. 



287 



the lower part of the Humphriesianus-zone at Oborne, where it is the most 

 abundant and characteristic species of Amberleya. 



218. Amberleya pagodiformis, sp. nov. Plate XXII, fig. 9. 



Description : 



Length . . . . .40 mm. 



Length of body- whorl to total height . . 48 : 100. 



Spiral angle .... 48°. 



Shell conical, eucycloid, turrited. The spire consists of about eight or nine 

 whorls, the apical conditions being unknown. Whorls angular and distended by 

 a large carina situated in the anterior region. In the earlier whorls of the spire 

 two tuberculated circlets may be distinguished, connected by a kind of axial 

 ribbing; the posterior circlet is close to the suture, the anterior one becomes 

 more and more prominent, and in the later whorls the tubercles project like the 

 teeth of a saw. 



Body-whorl large, angular, and similarly ornamented ; base rather flat, with 

 about four finely-granulated spirals ; the axial strias are wide apart, and strongly 

 marked throughout the shell. 



Aperture almost trapeziform, with a short and very straight columella. 



Relations and Distribution . — This form, it seems to me, helps to connect the 

 eucycloid with the trochiform Amberleyas. The want of biangulation makes us 

 regard it as a somewhat aberrant member of the goniata-grovq) ; whilst the flat- 

 ness of the base, the wide space between the two spirals, and the trapeziform 

 character of the aperture serve to connect it with Amb. biserta. 



Occurs sparingly at Bradford Abbas, and probably in the Murchisonae-zcme. 



219. Amberleya, cf. geneealis, Munster, 1844. Plate XXIII, fig. 3. 



N.B. — It must be borne in mind that the posterior portion of the last two 

 whorls in our specimen has been stripped of all ornament. 



The length of the figured specimen is 35 mm., the ratio between the length 

 of the body -whorl and total height 4S : 100, and the spiral angle 40°. 



Amongst other points of resemblance the serrated keel, anteriorly situated, is 

 conspicuous. One can hardly say whether this species should be referred to the 

 Eucyclus- or to the Troelms-section. 



The specimen is unique. It occurs in a brownish ferruginous stone, partly 

 ironshot, which resembles the matrix of the Humphriesianus-zone of Dundry. 



