13 
The possession of the silky ornamentation makes the species easily 
distinguishable from any other species in Alberta. 
Dimensions of Type. Length, 17 mm.; breadth, 9 mm.; apical angle, 
35 degrees. 
Goniobasis wehbi sp. nov. 
Plate III, figure 14 
This species differs from Goniobasis convexa (Meek and Hayden^) the 
most closely related form in its perfectly smooth surface: G. convexa has 
quite well defined revolving ridges which give it the appearance oia Melania. 
The new species is also somewhat smaller in size, and the whorls, especially 
the body whorl, are somewhat more angular than in G. convexa. Several 
samples of the young forms were found along with the adults. In these 
the apical angle is larger and the angle at the base of the body whorl sharper 
than in the adults. The species is named after Mr. John B. Webb who so 
ably assisted the author for two seasons in southern Alberta. Abundant 
in the Willow Creek and Edmonton formations, and one specimen was 
found in the St. Mary River formation. 
Dimensions of Type: Length, 27 mm.; breadth, 10 mm.; apical angle, 
25 degrees. 
Velatella rectistriata sp. nov. 
Plate IV, figures 2 and 3 
This species differs from V. haptista White of the Fort Union of Wyo- 
ming and Colorado in the character of the colour bands. In V. haptista 
the colour bands are irregularly radiating or vein-like, whereas in the new 
species they radiate from the beak in straight lines. Very few specimens 
of the new species show the character of the spire, but from the material 
at hand it would appe'ar that the spire is not so slender as in V. haptista 
and not so much coiled. Whiteaves (op. cit., p. 73) records V. haptista 
from the Belly River, but all his specimens were found to be referable to 
the new species. 
Dimensions of Type. Length, 11 mm.; width, 9 mm.; height, 6 mm. 
Horizon and Localities. This species occurs only in the Foremost 
beds, but examples were found at numerous localities. The best speci- 
mens were found on the north side of Oldman river in SW. | sec. 23, 
tp. 11, range 18, W. 4th mer. It is always indicative of brackish water 
conditions and occurs with Melania, Corhula, and Ostrea. 
Melania whiteavesi nodosa var. nov. 
Plate III, figure 16 
A few specimens from the Brosseau formation in North Saskatchewan 
river differ so decidedly from the regular form of M. whiteavesi that it is 
herein described as a new variety. The geology of North Saskatchewan 
‘G. convexa Meek, Kept. U.S. Geol. Surv., Terr., vol. 9, p. 592, PL 42, figs. 2a, b, and test figure 71 (1876). 
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