J. Starhie Gardner — On the Gault Aporrhdidce. 127 



canal is long, and curved slightly to the right. The length of the 

 spire is -054 and the canal -038. 



Distribution. — Gault of Folkestone, where it is rare; Cambridge (?). 



History. — In 1886 Sowerby figured an undoubted fragment of this 

 shell in Fitton's Memoir, Trans. G-eol. Soc, pi. xi. fig. 16, p. 336, 

 with the following note: — "Presumed to be a Bostellaria from its 

 resemblance to 22. marginata ; from which it differs in its great length 

 and smaller ribs." It has, however, a stronger resemblance still to 

 A. carinata, to which it is most closely allied. D'Orbigny in the 

 Prodrome, Pictet and Campiche, and Gabb mention it from Folke- 

 stone only, on Sowerby's authority. 



This shell should continue to rank as a species, for although each 

 differing character is not in itself of great importance, yet combined, 

 they give a very distinct aspect to the shell. 



Aporehais maxima, 1 Price (A. marginata, Pict. and Camp.). 

 Plate V. Fig. 4. 



Description. — Spire elongated, composed of eight or more convex 

 whorls, forming a regular angle of about 30°, finely striated spirally, 

 and ornamented transversely by about twelve regular ribs to each 

 whorl, which extend from suture to suture. These ribs disappear on 

 the last whorl, and are replaced by a single prominent and angular 

 keel. The wing and anterior canal resemble those of A. carinata. 



Distribution. — Gault of Folkestone, upper and lower beds. Gault 

 of the Perte-clu-Rhone and Ste.-Croix. 



History. — An impression of a shell of this species was found at 

 Folkestone by Mr. F. G. H. Price, who named it Bostellaria maxima, 

 and described it in the Geological Magazine for March, 1873. 

 Owing to the crushed condition of the only specimen then known, 

 and which I at the time carefully examined, it was not till a second 

 specimen was found that I observed it to be identical with A. 

 marginata, Pict. and Campiche, whose figure 2, pi. xciv., almost 

 exactly resembles the fragment I have here figured. Pictet and 

 Eoux's figures present the same characters, but are of much smaller 

 size. It is very desirable to obtain more perfect specimens. 



Apoeehais Carinella, D'Orb. Plate V. Figs. 5, 6, Qa. 

 Description. — Shell elongated, the spire forming an angle of 21°, 

 composed, when perfect, of twelve angulated whorls with a strongly 

 developed, acutely angular keel, situated a little anterior to the 

 middle of each whorl ; a second anterior keel is nearly concealed 

 by the suture, but appears on the last whorl. The whorls are finely 

 striated, especially the region anterior to the keel. The ridges, 

 which are very salient, are finely tuberculated at their apices, except 

 on the last two whorls. On the last or body-whorl, the keel is still 

 more prominent and acute, and is prolonged into a straight, angular, 

 ridged or carinated process, at nearly right angles to the axis of the 

 shell for a distance almost equalling the length of the spire, where 

 it bifurcates ; the anterior digit being a very short spur, and the 

 posterior, a long, gradually recurved point. The aperture is narrow, 



1 Sowerby having employed the name marginata for a different species, — that now 

 known as Orbignyana, — Mr. Price's name may stand. 



