BRONTEUS. 39 



1841. Goldius flabellifeb De KonincJc. Nouv. Mem. Acad. Brux., vol. xiv, 



p. 6, pi. i, fig. 1. 



1842. Brontes — W Arch, and de Vern. G-eol. Trans., ser. ii, vol. vi, 



pt. 2, p. 337. 



1843. — — F. A. Rom. Verst. Harzgeb., p. 37, pi. xi, fig. I. 1 

 1843. Beonteus — Gold/. Neues Jahrb., p. 549, pi. vi, fig. 3. 



1845. — — Emm. Neues Jahrb., p. 42. 



1846. — — Burm. Org. Tril., Ray Soc, p. 65. 



1867. — alutaceus, Trenkner. Palaont. Novitat., p. 4, pi. i, fig. 2. 



1876. — flabellifeb, F. Rom. Leth. Pal., pi. xxxi, fig. 3. 



1885. — — Clarke. Neues Jahrb., pt. 3, Beil.-Band, p. 323. 



Description. — Head with numerous fine and distinct tubercles. Depressions 

 on the glabella well marked; basal lobe wide, bearing three or four rows of 

 granules in the centre, and a prominence with a tubercle on each side, confluent 

 with the neck-lobe which is granulated. 



Thorax with ten segments, each having a row of granules. 



Tail flattish, almost circular. Axis short, tumid, wide, subtriangular, with 

 rounded margins indistinctly trilobed, produced to a point on each side. Limb 

 with fifteen narrow ribs, the side ones being the widest and not very much shorter 

 than the central ones, marked with a few irregular, unequal, and rather confluent 

 tubercles, only two or three on the width of the ribs. Furrows as wide as the 

 ribs. Border linear, elevated, preceded by a distinct wide concavity. Lineations 

 on the test of the lower side, very few, distinct, and ramose. 



Size of tail 12 mm. in length, 15 mm. in width, 3 mm. in depth. 



Localities. — The only two British examples known to me are the one figured on 

 Plate III, which is in Mr. Vicary's collection, and was obtained from the Dechenella- 

 beds of Chircombe Bridge, and a specimen of the tail in the British Museum, 

 which is rather larger, and evidently came from the Acervularia-beds of Ramsleigh 

 Quarry near Newton Abbot. 



Remarks. — This species was first quoted, without description, by Von Dechen 

 in the German edition of De la Beche's ' Handbook,' and some years after was 

 described by Goldfuss as the type species of his new genus Brontes. He then 

 figured an almost perfect specimen, but as the pygidium of his fossil was unsatis- 

 factory, he unfortunately restored it in his plate from a specimen which he after- 

 wards in 1843 found to belong to a different species, B. alutaceus. 



Phillips and other authors were misled by this, and identified with it the tails 

 of Bronteus found at Newton and Torquay, and hence the name B. flabellifer was 

 wrongfully introduced into the British lists ; and probably in all cases where it has 

 been quoted it stands for B. granulatus, or another of the commoner species. 



1 The figure correctly represents this species, but Clarke, who has examined Bbmer's specimen 

 states that it is incorrectly drawn, and that the specimen really belongs to B. granulatus (see p. 41). 



6 



