198 W. S. HucUeston — On the Yorlishire Oolites. 



differs from Alaria myurus in the shorter and more tumid spire, and 

 above all in the very slight prominence of the keels. It is, in fact, 

 \eYy near to the Al. IcBvigata, M. and L., of Hebert and Deslong- 

 champs (op. cit. pi. vi. fig. 10), which occurs in the Callovian of 

 Montreuil Bellay, and several of the numerous figures given by 

 Piette of Al. Icevigata, M. and L., bear considerable resemblance. 

 Hence the form is not uncommon, though none of these represent 

 the Al. lavigata of Morris and Lycett in anything but the impression 

 conveyed by the name. 



From the Yorkshire beds no other specimen is known to me. 



43. — Alaria, sp. Plate VII. Figs. 5, 5a. 



Description. — Specimen from the Dogger (zone 1), Peak (Blue 

 Wyke). Leckenby Collection. 



There has been a slight compression of the body-whorl, which 

 interferes with correct measurements, otherwise the proportions and 

 size are not dissimilar to those of Alaria teres. 



Shell fusiform, turrited. Five whorls are visible, and there were 

 probably three more to complete the spire. The highest A'isible 

 whorls are tumid, but apparently without keel, and are separated by 

 a wide suture. The antei'ior whorls become, each more angular 

 than the preceding one, with a proportionate development of keel : 

 the posterior half slopes outwards, the anterior half is nearly per- 

 pendicular. A rather coarse and unequal system of raised spiral 

 lines ornaments the shell, including the body-whorl, which has an 

 upper broad keel supporting a thick curved process or digitation, 

 and a lower ill-defined keel, which may or may not have terminated 

 in like manner. 



This fossil is in the matrix (though not drawn so), and there are 

 indications that, in addition to the compression of the body-whorl, 

 it has received some further mutilation ; hence its affinities must 

 remain problematical, since it is not possible to say for certain 

 whether it is bifid (monodactyl) or trifid (didactyl). In the latter 

 case it might have a remote connexion with such a form as 

 Alaria teres. No other specimen so distinct as this has come into 

 my hands, but two specimens of a small thick stunted Alaria (?) 

 were lately obtained by Mr. Herries, one from the Scarborough 

 Limestone of Cloughton, the other from the Millepore Eock at 

 Gristhorpe. Such fossils may indeed represent portions of the spire 

 of Chenopus [Aporrhais) or Pterocera. 



44. — Alaria arenosa, sp.n. Plate VII. Fig. 7. 



Description. — Specimen from the Dogger Sands (lower part of 

 zone 1), Blue Wyke. Leckenby Collection. 



Length 19 millimetres. 



Width of body- whorl to length of shell 31 : 100. 



Approximate spiral angle 25°. 



Shell elongate, strongly turrited. The spire increases with great 

 regularity, and consists of about ten whorls, of which seven are 

 visible. Each whorl has a median carina, which is strongly tuber- 



