486 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 9, 



Along the lines of these newer faults the most important of the 

 English lakes occur ; and they give to the Lake-country its bolder 

 features. 



Some lakes, however, such as Hawswater and Wastwater, which 

 have a north-east and south-west course, occupy valleys which 

 appertain to the older system of faults. In the case of UUswater 

 we have a more complex outline than usually belongs to the lakes 

 of the north of England. The first and lowest reach of the lake has 

 a north-east and south-west direction. At the south-west end of 

 this reach Hallan Crag presents a bold front, which results in part 

 from a fault running north and south, and crossing UUswater from 

 the valley near Howtown. The middle reach of the lake commences 

 on the west side of the north and south fault ; it also has a nearly 

 north-east and south-west direction, and terminates abruptly near the 

 north-western spur of Place Eell : the middle reach seems also to 

 occupy a valley produced by a fault belonging to the older system. 



The upper reach runs nearly north and south. It occurs in a 

 valley produced by one of the newer faults, which, crossing Eirkstone 

 Pass, continues southward through Trout Beck ; and it is to one or the 

 other of these two systems of faults, or to their combined influence, 

 that the beauty of the Lake-country chiefly owes its origin. 



Note on Two new Species of Trilobites. 

 By J. W. Salter, Esq., E.G.S. 



1. Phacops Nicholsoni, spec. nov. Figs, c & d. 



There is too little of this species to enable me to give a proper 

 diagnosis. It is evidently a species of the subgenus Acaste, and not 



distantly allied to P. Brongniartii, 

 a fossil from the Caradoc or Bala 

 rocks of Tyrone. I have two spe- 

 cimens — one found by Professor 

 Harkness, from which the figure is 

 taken; another, smaller, is in the 

 cabinet of Mr. H. Wyatt Edgell. 

 Each shows something the other 

 does not possess, and I shall de- 

 scribe them together, as the figure is a sketch made up from both 

 specimens. 



The whole form is broadly oval, much depressed, about half an inch 

 wide, and about 1 inch long ; the head is semicircular, rather pointed 

 in front, three-tenths of an inch long, and more than half an inch 

 wide. 



The glabella is trapezoidal, the sides are nearly straight and widely 

 diverging from the base, which is only half as wide as the forehead- 

 lobe. This is transverse, diamond-shaped, bluntly pointed, and 

 angular in front, and divided from the three lateral lobes by a slightly 

 sigmoid furrow, not deep, as in A. Brongniartii (the kindred species 



