Carboniferous Limestone Trilohites, 487 



farrows on eacli side. Neck-furrow deep ; neck-lobe rounded with 

 one prominent tubercle on the centre. Length of glabella 5 mm., 

 breadth 3^ mm., cheeks not preserved. 



Free thoracic segments unknown. Pygidium much broader than 

 long, very strongly trilobed ; axis elevated, consisting of twelve 

 coalesced somites ; each ring very strongly ridged, and each ridge 

 ornamented with a line of minute tubercles ; side pleurge nine in 

 number, rather broad for half their length, and minutely ornamented, 

 but becoming fainter for the latter half, and dying away near the 

 margin, which is almost smooth. Length of pygidium 6 mm., of 

 axis 5 mm., breadth of tail 9 mm., breadth of axis 4 mm. 



There are four examples of this small species in black Car- 

 boniferous Limestone from Bolland, part of the Gilbertson collection 

 preserved in the British Museum (Natural History). Each specimen 

 of a pygidium has also a detached glabella preserved together in the 

 same piece of matrix. There seems no doubt that the heads and 

 tails originally belonged to the same individuals. They are quite 

 unlike the ornamented pygidia of other species of Phillipsia, being 

 broader and shorter, and more delicately ornamented, the pleurae 

 of the tail in particular being very peculiarly marked in their 

 decoration and form, and in the break in their character midway. 

 They appear to be worthy of specific recognition. 



Formation. — Carboniferous Limestone. 



Locality. — Bolland, Yorkshire. 



Phillipsia soabra, H. Woodw. 1884. Plate XVL Fig. 1. 



FhilKpsia scahra, H. Woodw. Pal. Soc. Mon. Carb. Trilob. part ii. 1884, p. 43, 

 pi. ii. figs, ha and h. 



This species is based upon a head-shield and two pygidia from the 

 Carboniferous Limestone, Vallis Vale, Frome, Somerset,^ preserved 

 in the Museum of Practical Geology, Jermyn Street. 



The head-shield is 12 ram. in breadth by 8 mm. long. The 

 glabella is prominent, rounded in front, but not overhanging the 

 raised anterior border of the cephalon ; three oblique furrows mark 

 the sides of the glabella, the front furrow being nearly in a line 

 with the anterior angle of the eye ; the basal lobe is large, obtusely 

 triangular in form ; neck-lobe 1 mm. deep, divided by a shallow 

 furrow from the glabella ; pleuras of neck-lobe extending for three- 

 fourths the breadth of free-cheeks, and terminating acutely along 

 their posterior margin ; lateral border of glabella narrow, but 

 expanding into a moderately broad margin in front of the glabella. 

 Free-cheeks small, with a broad and very distinct margin separated 

 by a deep furrow ; the margin is striated longitudinally ; the head 

 and cheeks are scabrous, most strongly so on the posterior half of 

 the glabella. The eyes were large, nearly 3 mm. in length ; they 

 are unfortunately wanting, being represented by the cavity only. 



1 Mr. R. H. Valpy, F.G.S., Enborae Lodge, Newbury, informs me that be 

 discovered a bed of shale of Carboniferous age with Trilobites in an excavation made 

 for the Kifle-butts on the top of Black Down, on the Mendip Hills, Somersetshire. 

 They were associated with Entomostraca. 



