ETOHEMINIAN FAUNA OF CAPE BRETON. 199 



It is therefore more reasonable to expect a discordance of strata in this 

 region between the Cambrian and the Etcheminian than in the region 

 of New Brunswick where the Lower Cambrian is present. 



The conditions for the preservation of fossils seem to have favor- 

 ed more the region of Cape Breton, for there we have a fuller fauna 

 than in New Brunswick. 



Though fossils are also more abundant in the Etcheminian of 

 Newfoundland than in the last named province, that fauna is quite 

 dis-similar from the one in Cape Breton. This latter fauna has a 

 facies similar to that of the Protolenus Zone in New Brunswick, if we 

 eliminate the trilobites from the latter. In fact every geuus in this 

 new fauna has its counterpart in the Protolenus Zone ; but when it 

 comes to a comparison of species, we cannot find one that is common 

 to the two faunas. Hence we must believe there is a greater differ- 

 ence in age than at first sight appears. 



It is to be remarked however, that if the sequence of similar physi- 

 cal events were contemporary in the two regions, the most characteristic 

 part of the known fauna of the Etcheminian in New Brunswick lies 

 below the fossiliferous zones in Cape Breton from which came the fossils 

 described in the following pages. Hence this fauna might be expected 

 to show a closer relation to that of the Protolenus beds than any 

 other Etcheminian fauna, described, especially if we regard also the 

 similar physical conditions which environed the two faunas. 



DESCRIPTION OF THE FOSSILS. 

 Lingulella Gregwa, n. sp. PL I., figs, la to /. 



This species has a long acuminate beak to the ventral valve like 

 Lingulepis pinniformis of a later fauna, but the dorsal valve is quite 

 different ; its central group of scars is advanced far to the front, as in 

 Obolus, and in connection with this feature a flattened band traverses 

 the centre of this valve ; this flattened area is narrower than that of 

 Mickivitzia monilifera and Obolus major, and it is a smaller species 

 than the latter. 



Sculpture. — The surface of the valves of this species has a dull 

 appearance, and under the lens the ornamentation is resolved into 

 irregular concentric beaded ridges. 



Size. — Length of ventral 12 mm., width 9 mm. The dorsal valve 

 is 3 mm. shorter than the ventral. 



