112 GASTEROPODA OF THE INFERIOR OOLITE. 
The last whorl is somewhat inflated, and similarly ornamented. There are 
indications that possibly another whorl may have been broken off. 
In the paucity and thickness of its longitudinals, this form bears some resem- 
blanee to Al. rarispina, Schlumb. In order to avoid a mistaken identification I 
would suggest the name CRASSICOsTATA as provisional. A single specimen in the 
Dogger. 
30. ALARIA? sp. nov. Plate IV, fig. 4. 
The spiral angle is about 30°, the length of the specimen about 20 mm., and the 
number of whorls ten. ‘he whorls of the spire are short and strongly turrited. 
The sculpture is rich, the longitudinals being numerous and stout, but somewhat 
irregular ; they are mainly confined to the lower part of the whorls, and are 
extremely nodular at the junctions with the spirals. There is no very salient keel, 
but the anterior portion of each whorlis marked by three coarse spirals, the upper- 
most of which serves as a keel, and above this are from three to four fine wavy 
spirals. The body-whorl is similarly ornamented, but shows rather more irregu- 
larity. It shows no sudden increase. 
Since the specimen is unique and imperfect as regards the aperture, but little 
can be said by way of comparison. The rich and nodular character of the sculpture 
seems to separate it from all forms of the hamus-group, and, supposing the 
shell to be complete in that case the body-whorl is totally different. It was found 
in the shell-bed of Horton Hill corresponding to the Upper Trigonia-grit (base 
of Parkinsoni-zone), and may be known temporarily as Au. Horronensis. 
The Hamus-Group. 
A very considerable portion of the more strongly turrited and costate Alarie 
belong to this important group, which is eminently characteristic of the Monodacty] 
section. ‘They occur principally in the Upper Division of the Inferior Oolite, at 
least inthe South of England. The forms which most nearly resemble the typical 
specimens of the Bayeux-beds are to be found chiefly in the Parkinsoni-zone of 
South Dorset, but micromorphs and varieties, such as Al. Phillipsii, occur in many 
parts of the Inferior Oolite. Also there are doubtful fossils such as Al. ‘‘ spinulosa,” 
which may be immature individuals of Al. Phillipsii, or, more probably, of Al. 
unicarinata. 
