FAUNA OF THE ST. JOHN GEOUP 63 



in the thiu dorsal hinge line.' The three diverging ridges which are found in the ven- 

 tral valve of the two last species are not present in O. pulcher ; in this there are radiating 

 lines, but these appear to be vascular lines, and do not have the same position as the 

 ridges in the two first species. 



The internal markings of the dorsal valve in the last species are similar to those of 

 O. refulgent, but as de Verneuil does not figure the interior of the dorsal valve of 

 O. Apol/inis, means of comparison with the dorsal valve of this species are wanting. 



An important difference between O. pulcher and the two other species is in the hinge, 

 and especially iu the different form of the umbo. The prominent umbo of this species 

 has been fully described in the author's paper on ' Cambrian organisms,'^ and is of the 

 greater value as a distinctive feature, since it is most noticeable in the earlier stages of 

 growth. In O. refulgens the beak in both valves is always low and appressed to the mar- 

 ginal line (though that of the ventral valve is somewhat more prominent than the other), 

 and an appressed beak seems also to have characterized O. Apollinis. 



The differences in these respects and others between O. pulcher and the later Oboli 

 are, we think, of subgeueric value, and we would propose for O. pulcher the subgeneric 

 name Botsfordia, in honour of the late president of the Natural History Society of New 

 Brunswick. 



Late studies by Dr. Charles Barrois, of Lille, France, on the Palseozoic rocks of the 

 Asturias and Galicia in the north-west of Spain,^ shows how strong a local facies in a 

 fauna may coexist with a general succession of species in consonance with that of other 

 countries. 



Dr. Barrois chronicles from the provinces above named a Cambrian fauna consisting 

 of eight species, of which one is a cystidian, one a brachiopod, and the remainder are tri- 

 lobites. A peculiarity of this fauna is that while it contains some of the species which 

 Barraude described from the neighbouring province of Leon, several species are peculiar 

 to it, and predominate in numbers over the species which Barrande had found in Leon. 



The genera are all characteristic of the Lower Cambrian fauna, and the Paradoxides 

 are of an ancient type, related, as Dr. Barrois tells us, to P. rugulosus and P. ^pinostis. He 

 describes a new species of Paradoxides of this type related to P. ri/gulosus, and figures a 

 hypostome belonging to it ; the hypostome resembles those of this group in having no 

 doubleur attached, but differs in having no posterior spine. 



In conclusion, the writer desires to express his thanks to Dr. Gr. Liudstrom, of the 

 Eoyal Museiim at Stockholm, for aixthentic specimens of Orthis lenticularis, and to Prof 

 W. F. Ganong, of Harvard College, for procuring original descriptions of this species. 



' The difference ia this respect tlie autlior supposes may be due to a difference of habitat. 



- ' Trans. Boy. Soc. Can.,' Vol. vii, Pt. iv, p. 152. 



" " Recherches sur les terrains anciens des Asturias et de la Galice," par Ch. Barrois, D.S., Lille, 1882. 



