ALARIA. Ill 



28. Alaria angdsta, sp. nov. Plate IV, fig. 2. 



Description : 



Length . . . . .22 mm. 



Width of body- whorl to length of shell . . 30 : 100. 



Approximate spiral angle . . .21°. 



Shell fusiform, turrited. Apex blunt. Whorls about ten, prominent and deeply 

 divided by the suture on the principal whorls of the spire ; the carina is very nearly 

 median, and the slope of anterior and posterior moieties nearly equal. The longi- 

 tudinal costse are well developed, and especially prominent on the keels ; they extend 

 almost from suture to suture, but are strongest anteriorly. The spirals are close, 

 undulating, and distinct ; about seven fine ones in the posterior half of the whorls, 

 and four or five stouter, and wider apart, below the keels. The last whorl is 

 but slightly ventricose, and has ornaments nearly similar in character to those of 

 the spire, except that the costae are reduced to tubercles on the keel, and that 

 there is a faint trace of an anterior keel at the base. The canal-sheath is broken 

 off short ; other indications wanting. 



Relations and Distribution. — Although the specimen from which the above 

 description is taken seems never to have carried a wing, the indications are clearly 

 those of an Maria. The blunt apex, and nearly smooth apical whorls, afford 

 additional evidence in this direction. We may regard it either as an immature 

 shell, or as a species of Alaria which had not developed a wing (Adactyl). In 

 many cases the absence of a wing is due to mutilation, but hardly so in this. From 

 the whole of the hamus-group it is separated by the ornamented character of the 

 body-whorl, and by considerable differences in the ornaments of the spire and 

 other features. It comes pretty near in many respects to Alaria arenosa. 



The specimen is unique, and forms part of the Inferior-Oolite collection in the 

 Bristol Museum. I have no note as to the horizon or locality. It is a well preserved 

 spathic fossil in a fawn-coloured limestone, which is not iron-shot. 



29. Alaria? sp. nov. Plate IV, fig. 3. 



There is hardly enough of this fossil remaining to determine its true character. 

 The whorls are very tumid and without much keel. The spiral ornaments are 

 numerous and well cut ; the longitudinal costas are very thick and wide apart, and 

 extend almost from suture to suture. The spiral angle appears to be rather wide. 



