Abstracts of Papers read on Geology. 455 



One fresh specimen of Vetaeapsula johnsoni (Kidston) has come 

 under notice from the Worsborough open works near Barnsley. It 

 is in too crushed and imperfect condition to show any new features. 



A new species of Vetaeapsula has been recently described by 

 Mr. Good ^ from Pembrokeshire. It is very similar to Vetaeapsula 

 johnsoni, but is extremely small, measuring only 5 mm. across, whereas 

 Vetaeapsula Johnsoni measures 20 mm. 



A new specimen of Fayolia crenulata (Moysey) has been discovered 

 lately from a small heap of nodules still remaining from the 

 Shipley Claypit. The former example from Shipley consisted of the 

 middle portion of the organism 11cm. long; another specimen, 

 doubtfully referred to Fayolia sterzUana (Weiss), from the same 

 locality, was evidently nearing its proximal or pedicular termination. 

 The new specimen is of interest mainly because it shows the apex or 

 distal termination, which appears to have been dome-shaped. The 

 chief feature is the marked exaggeration of the crenulate ' collerette ' 

 which arises from the junction of the two spiral valves, and which 

 forms a sort of spiral ' corona ' round the apex of the fossil, strongly 

 - reminiscent of the corona at the summit of the egg-case of Cestraeion 

 philippi. 



(4) On the Conditions which goveen the Tkansport and 

 Accumulation op Deteitus by Wind and Water. By Yaughan 

 Cornish, D.Sc, F.R.G.S., F.G.S., F.C.S. 



rPHE author dealt with the conditions of the transport of detritus 

 JL superficially and in suspension. He pointed out that the rate 

 of subsidence is the constant which best defines the behaviour of 

 a granular material with respect to transportation by currents. He 

 showed how detritus may be classified in three groups according to 

 the value of this constant, these groups being familiar as shingle, 

 sand, and mud, in the case of water-borne material, and gravel, sand, 

 and dust in the case of wind-borne detritus. 



It was pointed out that the change of direction of the vertical 

 currents in sea-waves does not occur simultaneously with the change 

 of direction of the horizontal currents, and it was shown that the 

 result of the sequence of the changes is to endow waves with a shore- 

 ward action upon shingle and the coarser kinds of sands independently 

 of any motion of translation in the water. 



In tides also, rise does not commence simultaneously with flow, nor 

 fall with ebb, and the author showed that the sequence of these 

 changes is such as to make the flood tide more effective than the ebb 

 as an agent of littoral drift, apart from any greater speed of current. 



Examples were given of the different positions in which deposits 

 of detritus accumulate according to the rate of subsidence of the 

 particles. 



An explanation was given of the effect of a change in the 

 inclination of current to the horizontal in sorting heterogeneous 

 detritus, and examples were given for wind-borne material. 



^ E. H. Good, Quart. Journ. Geol. Soc, vol. Ixix, p. 266, pi. xxx, fig. 3, 1913. 



