50 F. R. Cou-per Reed — New Bala Trilohites. 



The third furrow is parallel to and as deep as the second at its 

 inner end, but does not decrease in depth to the same extent in its 

 outer portion. The second lobe has a rounded termination, but, 

 except for this character and a greater length, is much like the first. 

 The neck furrow is parallel to the third furrow, and rather deep 

 along its whole length ; it bounds posteriorly the third lobe, which 

 is more prominent and better defined than the second lobe. The 

 lateral extension of the neck furrow and the neck lobe are not well 

 preserved, but the latter appears to have been slightly wider than 

 the third lobe. The axal furrows are shallow. In front of the 

 first lobe they are practically non-existent, for the ocular ridge and 

 "terminal pit" lie across their forward course. 



The surface of the glabella is sparsely strewn with a few large 

 tubercles which do not show any symmetrical arrangement. 

 Smaller tubercles are visible between the large ones, and minute 

 pits also occur, but not very numerously. Each of the two hind- 

 most lobes bears two tubercles of large size ; and the anterior end 

 of the glabella shows an aggregation of large and small tubercles 

 without any linear or other regular order. The anterior end of the 

 glabella is steep and abruptly truncated ; it is separated from the 

 peculiar anterior margin by a very faint depression. The middle 

 portion of the anterior margin projects to a distance of just half 

 the length of the glabella as a central flat spatulate process, in the 

 specimen before us bent upwards at an angle of 45°. It is traversed 

 by five low, but distinct, flattened ridges, separated by narrow and 

 faint grooves which deepen in their forward portion. These ridges 

 and grooves radiate from the front of the glabella in a fan-shaped 

 manner ; and on the anterior border of the spatulate process the 

 ridges end as five short blunt projections. The border of this 

 process has, therefore, a notched appearance. Two or three much, 

 fainter ridges and grooves occur on each side of the five central 

 ones, producing a slight serration of the margin. 



A clue to the origin and formation of this peculiar process seema 

 to be given by the presence in a few species of Cybele of several 

 radiating spines of greater or less length on the anterior margin ; 

 and if, for instance, in C. coronata (Schmidt) these spines were 

 fused laterally together so as to leave only their tips free w6 

 should get a snout-like projecting process very similar to that in. 

 the Irish form. That such is the origin and composition of the 

 spatulate process is rendered additionally probable by the presence 

 of the radiating ridges, for they would represent the last traces 

 of the formerly separate spines. In C. coronata, however, the spines 

 diverge more strongly than do the ridges on the spatulate process 

 of this new species. 



Just outside the point on the anterior margin from which this 

 process starts forwards, and slightly in front of the anterior outer 

 angles of the frontal lobe of the glabella, there rises a low but well- 

 marked rounded ridge which runs forwards and a little outwards, 

 to become a prominent rounded tubercle projecting beyond the 

 margin, which has here a width equal to about half the length 



