36 DEVONIAN FAUNA. 



basal lobe represented by a low central portion with two rows of tubercles, and a 

 single tubercle on each side. Neck-furrow less distinct. Neck-lobe arched 

 and high. 



Facial sutures starting just beyond the front angle of the glabella, almost 

 parallel to each other two-thirds of the way down, and then, after forming a small 

 deeply arched eye-lobe, turning rapidly outwards in a graceful curve to cut the hind 

 margin near the genal angle, and being in this part in the form of a raised, 

 rounded ridge. Inferior margin horizontal and nearly straight. 



Surface of the head covered with numerous very coarse tubercles, largest at 

 the back of the glabella, and showing a very slight tendency to merge into trans- 

 verse lines close to the front border. 



Eye low, rounded, kidney-shaped, with very convex sides, surmounted by a 

 coarsely tuberculated eye-lobe. Lenses beautifully arranged in about thirty-six 

 arching rows of about fifty-six facets each, so that probably the total number is 

 not far short of 1800 or 2000. Texture of test very thin. Thorax unknown. 



Tail entire, fan-shaped. Axis very small, triangular, wider than long, tumid 

 in the middle, slightly trilobed by two lateral depressions, bounded by a definite 

 furrow. Ribs fifteen in all, flattened, divided by linear grooves disappearing at the 

 margin ; covered with uniform tubercles rather irregularly arranged, on an average 

 three or four on the width of a rib. Central rib largest, the rest diminishing in 

 length and width as they recede from it. Test very thin, in two layers. 



Under surface. Rostral shield very wide, somewhat swollen in the centre, 

 and covered by fine, irregular, and distant transverse grooves. Tail with two very 

 thin layers, the exterior finely granular, the inner one covered by fine grooves 

 similar to those of the rostral shield. 



Size. — A small head retaining the cheek measures 15 mm. in length, 28 mm. 

 in width, and 9 mm. in depth. A very large tail in the British Museum 

 measures 76 mm. in length, 85 mm. in width, 14 mm. in depth. 



Localities. — This species seems to be not infrequent at Lummaton and 

 Wolborough. From the former place I have collected eleven heads and two 

 tails. There are five tails from Lummaton and two from Wolborough in the 

 British Museum, and one from Lummaton in the Woodwardian Museum. There are 

 also eleven tails of Bronteus in Mr. Vicary's collection, seven in the Bristol Museum, 

 and several in the Torquay Museum, but at the time I saw them I had not 

 recognised that there was more than one species from these beds, and therefore 

 am unable to say to which they belong. Phillips quotes P. fiabellifer from 

 " Hope," but I have not seen any specimens from that place. 



Remarks. — The tails of B. pardalios may be distinguished from those of B. 

 granulatus by their narrow linear furrows and larger and more regular spots ; from 

 those of B. alutaceus by their much fewer and larger spots ; from those of B. 



