260 E. Wilson — British. Liassic Gasteropoda. 



West of England," the late Charles Moore described two incomplete 

 shells from the Lower Lias coralliferous conglomerate of Brocastle, 

 Glamorgan, under the names Alaria rudis, Moore, and A. fusiformis, 

 Moore (Q.J.G.S. vol. xxiii. p. 566, ph xiv. figs. 24, 25). Having 

 lately examined these specimens in the Bath Museum, I would 

 question very seriously the generic appellation given to these fossils. 

 In their general proportions both these shells are very unlike typical 

 Alarice, and seeing that they show no distinct canal or trace of 

 digitation, their identification as such must be considered doubtful. 

 On the other hand, there are a few forms in the " Moore Collection " 

 at Bath, at present ascribed to other genera, which may eventually be 

 shown to belong to the genus Alaria. For the present, the little 

 shell from the Lower Lias of Bitten, Gloucestershire, must, I believe, 

 be considered the earliest definitely established British Alaria, if not 

 indeed the earliest known example of that genus. 



Alaria Hudlestoni, spec, nov. PL V. Fig. 13. 



Description. — Shell turrited, scalariform ; apex acute ; spiral angle 

 slightly concave ; whorls 8-9, quadrangular and rectangularly 

 bicarinated, with wide and deep sutures ; the carinse each bear a 

 finely-granulated thread over the angle, the posterior of which is 

 rather more prominent, and causes this keel to project a little more 

 than the anterior one ; the posterior carina is encircled anteriorly by 

 a narrow impressed line ; the whole of the spire and apparently also 

 the base is covered with fine oblique radial lines ; in the earlier 

 whorls the anterior carina is submedian and much more prominent, 

 and is coronated over the angle by vertical costee, whilst the posterior 

 carina is much less prominent ; the base of the shell is almost flat, 

 it bears 3 or 4 widely-separated concentric raised lines. The wing 

 consists of a single digitation, which has a general direction at right 

 angles to the axis of the shell ; this is wide at its origin, directly 

 below the anterior carina of the last whorl, after proceeding a short 

 distance it suddenly narrows, and then soon tapers away to its 

 rather blunt and slightly recurved extremity. Canal unknown, the 

 canal-sheath being broken off at its origin. 



Dimensions. — Length of shell without the canal, 7-5 millimetres ; 

 diameter of last whorl, 4 mm. ; breadth of same, with wing, 8 mm. ; 

 spiral angle, 30° ; sutural angle, 105°. 



Ohs. — i name this interesting fossil after Mr. W. H. Hudleston, 

 M.A., F.R.S., who has contributed so largely to our knowledge 

 of the Gasteropoda of the British Oolites. 



Geological Position and Locality. — Lower Lias, zone of Am. Buck- 

 landi (lower portion), Stout's Hill, Bitton, near Bristol, Gloucester- 

 shire. 



Alaeia semicostulata ? Piet. et Eug. Desl. PI. V. Figs. 14 & 15. 



1864. Alaria semicostulata, Piet. et Eug. Desl. Pal. Fr. Terr. Jur. Gast. vol. iii. 

 p. 18, plate i. figs. 7—9. 

 The following description of the more perfect of Mr. Crick's 

 specimens will be found to agree pretty closely with that given by 

 Piette {I.e.). 



