OF THE SPECIES. C5 



tlie glabella, runs on both sides rather cui-ved towards the eye, wliich scorns to be 

 situated beside the narrowest part of the glabella. It then forms over it the well known 

 covering-plate, and turns itself with an S-shaped curvature towards the posterior margin, 

 where it seems to terminate not far from the external angle. 



The ten rings of the body are short, almost as broad as their lateral lobes, and are 

 diagonally arched; the lateral lobes towards the exterior part are flat, with a strong 

 curvature backwards. 



The caudal shield is very large, circular, or slightly parabolic ; it contains at the 

 anterior part a very short one-jointed axis, from which radiating furrows and broad ribs 

 proceed to the sides. 



Locality. — In Devonian and upper Silurian strata. 



1. Br. flabellifer : Superficie tota graruilata; costis scutae caudalis quindecim, sulcis latitudine 

 sequalibus, serie granvilorum majorum uotatis. Long W^-^Yi". 



Ä^— GoLDF. /. c. 361, Fig. 3. Leonh. u. Bronn. JaJir/j. 1843, 349. 3. Tab. XYII, 

 Fig. 3. RoEMER. Ferst, d. Harzes. 37. 1. Tab. XI, Fig 1. 



The granulation on the cephalic shield consists of tolerably large tubercles, between 

 ■which there are some very small ones ; the rings of the body and lateral lobes have a 

 diagonal row of tubercles ; the almost circular shield exhibits fifteen elevated ribs, which 

 are divided by nearly equally broad intervening spaces, and on each rib there are many 

 nearly equally large tubercles, three or four together, the central being largest and most 

 prominent. The centre of the entire shield is convex ; it becomes flattened towards the 

 margin, and expands into a horizontal border. 



Remarks. — Count Münster has figured [Beitr. z. Petref. iii. Tab, V, Fig. 13) several fragments 

 which belong to caudal shields of Bronteus. Fig. 13, B. radiutus, Fig. 15, B. subradiaius, appear to 

 me hardly to differ from B. flabellifer. Fig. 14, B. costatus, Fig. 16, B. Neptuni, have a longer 

 axis. The former has the same number of ribs as the species now ])eforc us, but is very different in 

 size and structui'e. The latter [B. Neptuni) seems to approximate to Ent. laticauda, Wahl., in its nine 

 flat ribs. 



2. Br. laticauda: Superficie glabra, transverse lineata; costis scut» caudalis tredecim, latis, 

 planis. Long. ? 



Ä//.— Wahl. N. Act. Ups. viii, 28. 3. Brong. Crust, fos. 24. 5, PI. Ill, Fig. 8. 



ScHLOTH. Petref. Naehtr. ii. 22. 5. 35. 12. Dalm. Paland. 52. 13. and 71. 18. 



Beyrich, Böhm. Tril. 42. 4. f. 8. 9. 



Wahlenberg described specimens obtained from a white limestone from Osmundsberg, 



in Dalecarlia, and the fragments which I examined in the Berlin Museum (Nos. 7. 1-4.) were 



heaped together in a ver)' similar deposit. The cephalic shield consisted as usual of a 



single central piece having an anterior and posterior strongl)' reflexed margin, the former 



being narrow and strongly curved, the latter rather broader, but less strongly arched. The 



curvature may have corresponded with the rings of the body. A stamp-shaped, slightly 



lobed glabella occupied the whole central part, and became broader at the anterior margin 



laterally. Close to it at each side the nearly circular cheek portion arched itself, and at 



the posterior margin of this a covering plate for the eye seemed to be indicated. I did not 



find any cheek-shields. Tiic caudal shield was more parabolic, had a nearly equilateral 



9 



