ALARIA. 117 



is well exemplified in " Rostellaria " composita, Sow., a lower Oxfordian fossil, 

 Alaria seminuda, Heb. and Desl., and probably others. 



35. Alaria hamds, Desl., var. nodosa. Plate IV, fig. 9. 



A single specimen, said to come from Stoford, in the Buckman Collection, 

 presents some curious analogies with, and yet some marked differences from, Al. 

 hamus. It is a stouter and larger shell than the average of South-Dorset 

 specimens. Number of whorls ten to eleven; not only are the apical whorls 

 smooth and without ornament, but this peculiarity extends to the subapical whorls, 

 so that the turrited character characteristic of the hamus-growp is not developed 

 until much later. The longitudinals are extremely thick and nodose. The wing 

 overlaps the lower half of the penultimate, a feature not preserved in the Burton 

 Bradstock specimens ; there seems also to have been an anterior spine on the keel 

 of the body-whorl instead of a mere spinous swelling. 



36. Alaria pinguis, sp. nov. Plate IV, fig. 10 ; and Plate VII. fig. 11. 



Description. — Since the available specimens are probably incomplete, dimensions 

 cannot be given, but the spiral angle is about 45°. Spire wide-angled and conoidal, 

 and consisting of eight whorls ; the apical whorls, as usual, plain ; subapical 

 whorls convex and either plain or spirally striated; the anterior whorls possess 

 coarse longitudinal tuberculation in addition to the spiral ornaments. Body-whorl 

 bicarinate, keels plain or nearly so. 



Relations and Distribution. — Through the var nodosa there seems to be some 

 connection between these shells and the regular Al. hamus. Yet, omitting that 

 possible intermediary, the differences are so great as to warrant a somewhat 

 stronger distinction. Since none of the processes are known, the species must be 

 regarded as tentative and incomplete. 



Rare in the Parki?isoni-zone of Dorset. The specimen, PI. IV, fig. 10, is 

 from Stoford, horizon unknown ; the specimen, PI. VII, fig. 11, is from P l5 

 Vitney Cross. 



