WHITEAVES.] FOSSILS or TEIASSIC ROCKS OF BRITISH COLUMBIA. 137 



apparently somewhat pointed above and a little sinuous on, the 

 eolumellar side: outer lip thin and simple. 



As viewed in its dorsal aspect the last whorl of the spire is seen to 

 be encircled by three rather distant raised lines or minute spiral ridges, 

 one of which is placed on the shoulder above, one in the middle and 

 one close to the suture below. The outer whorl bears four rather dis- 

 tant spiral, raised lines on its upper half, and below those there are a 

 number of others which are finer and much more closely disposed. 

 When examined with a lens, the whole of this spiral sculpture is seen 

 to be crossed and overlaid by densely crowded and exceedingly minute 

 raised strias. Test extremely thin. 



As the apex is broken off in each of the few specimens collected, it 

 is not practicable to give the exact proijortionate dimensions of any. 



Liard River, about thirty miles below Devil's Portage, R. CI. McCon- 

 nell, 1887 : four casts of the interior of the shell, in two of which portions 

 of the test are well preserved. 



It is possible that this shell may not be a true Margarita, but it seems 

 l(j be more closely allied to the M. spiralis of Miinster, from the Trias 

 of St. Cassian, as figured by Zittel, than to any other genus known to 

 the writer. Professor Hyatt, who has examined two of the best speci- 

 mens collected by Mr. McConnell, thinks that they resemble the Turbo 

 Johannis Austria; of Klipstein (figured in Stoppani's "les P(5trification8 

 d'Esino," pi. 14, fig. 16), but that "they are not quite so elevated, 

 their whorls are flatter above and their spiral ridges better mai-ked." 

 It is, however, quite evident that they cannot be referred to the genus 

 Turbo as now restricted, and it is most likely that their affinities are 

 rather with the Trochidte than the Turbinidse. 



CEPHALOPODA. 



Nautilus Liardensis. (N. Sp.) 



Plate 18, figs. 1 and 1 a- 



Shell broad, subgloboso, but deeply though rather narrowly umbili- 

 cated: maximum breadth of th,) aperture about equal to the entire 

 length, as measured from the centre of the outer lip to a correspond- 

 ing point on the periphery of the opposite side. Volutions very 

 closely embracing, the inner ones almost completely covered, the 

 outer one increasing rapidly in size, but expanding much more ra- 

 pidly in a lateral than in a dorso-ventral direction : periphery somewhat 



