=25— Davisonites canadensis Whiteaves - (@late VIII, figure 6) Only one of the specimens, the one illustrated by Whiteaves, 1s preserved. It is avfairly good eh ve although the surface is a little worn. The whorls ive flattened sides, almost angular nell t sal shoulder, somewhat flattened venter, rounded ventro-lateral shoulder, Aa a distinct ventral sulcus. The momen ous) slender ribs are nearly straight on the sides and projected forward on the ventro-lateral shoulder; a few divide on this shoulder into two slender maar A few indistinct tubercles are on the umbilical shoulder. About 7 or 8 rows of tubercles are on the sides. - The ribs end in swellings on the border of the ventral sulcus on the posterior part of the ultimate whorl; but the shell may have exfoliated here somewhat. They end in raised Sunes each bearing peor anw ty, two tubercles, mach as in Trachyceras, on the anterior part of the aia whorl. No Peano keels are present. The suture line is very simple and ceratitic. Goods Silenticeras McLearn Silenticeras was. eet etaeiie deacnen as a pup e pte of the oman floine genus past coe MoJetsovies, ae it lacks the even ribbing of that genus. ' $ilenticeras is alate’ ts the ‘Trachyocratidas: in the broad sense, representing a stock in which the ornament of ribbing Soul tubercles has been lost, or never acquired, and in which the growth lines have become strongly projected. It lacks the ventral Hoey of prpedi tes Meoanovaen | and also the faint tubercles of Hopateinia mousraevane: and has aa stronger projection of growth lines. Silenticeras mee McLearn — (Plate v, TEL: 5 to 8) - This species resembles Arvadites deren en onne ton from Nev Pass, Nevada, but lacks the ventral keels. Genus Asklepioceras Reng The species in northeastern British Columbia differ very much among themselves, but all show.some resemblance to svecies rs Asslepiqcerss and can be referred to this genus if it is interpreted in a pec sense. All have the deep, strongzly projected, radial furrows, and all have a ventral sulcus, but