Description of the Fossils in the older Deposits of the Rhenish Provinces. 337 



Silurian system. Eicliwald unites to A. tyrannus a fragment of a Trilobite discovered upon the coasts 

 of the Gulf of Finland. (Syst. Silur. Esthonie, p. 87.) 

 Found in the slates of Wissenbach ; very rare. 



5. Brontes flabellifer, Goldf. Nova Acta Acad. Caes. Leop. Nat. Cur. Bonn, vol. xix. pars 1 . PI. XXX. f. 3. 



The post-abdomen of this species was formerly known under the name of Olenus flabellifer. The 

 head and body, being extremely rare, had never been figured before the specimen which Goldfuss col- 

 lected in the Eifel, was given in the Bonn Transactions. 



We have observed this Trilobite at several places in the Strigocephalus limestone, which extend 

 from Elbersfeld to Hagen, and particularly near Mettmann and Lethmate. The genus Brontes is one ol' 

 the most constant in the Devonian system; for besides being found on both banks of the Rhine, Count 

 Munster has collected four species in the Orthoceratites limestone of Elbersreuth. One of these, the B. 

 radiatus, appears very near, if not identical with, B. flabellifer (Miins. Beitriige zur Petrefact., 3 Heft, 

 Taf. V. f. 13). This Brontes is also fcund in the limestones of Devonshire which are of the same age, 

 and M. de Gerville obtained a fine specimen from the limestone of Valognes, the geological position of 

 which is not yet well determined. Lastly, M. de Koninck mentions it in the limestones and lower slates 

 of Chimay and Couvin, beds which also belong to the Devonian systemf . We do not yet know if it has 

 occurred in the beds of the same epoch in the Bas-Boulonnois. 



Harpes macrocephalus, Goldf., loc. cit., supra, Plate XXXIII. fig. 2. 



The genus Harpes was established by Goldfuss for Trilobites found in the limestones of the Eifel. 

 We have found the H. macrocephalus in the Goniatites limestone of Oberscheld (Nassau). The H. spe- 

 ciosus of Count Miinster, which comes from the neighbourhood of Elbersreuth, appears to us difficult to 

 distinguish from the species of Goldfuss. Phillips has also found this species in the Devonshire lime- 

 stones. (Pal. Foss. PI. LV. fig. 24.) 



Homalonotus Knightii, Konig. Icon. Foss. Sect. Centuria Prima, PI. VII. f. 85. Murch., Sil. Syst., 

 PI. VII. f.], 2. 



This species of the upper Ludlow rock is found also in the slates of Wissenbach and Altenahr. 



Homalonotus Herschelii, Murch., Sil. Syst., PI. VII. bis, f. 2. 



We have found this Trilobite in the greywacke of Daun. 



GONIATITES. I. Lobes simple, rounded and slightly inflected. 

 L Goniatites subnautilinus, Schlot. De Buch, Ann. des Sciences Nat., tom. xxix. PL I. f. 9-11. 



The sphaeroidal form of this almost completely enveloped species distinguishes it from the following, 

 to which de Buch would nevertheless be disposed to unite it, in consequence of the analogy of the 

 lobes. 



Wissenbach ; rare. 



2. Goniatites Nceggerathii, de Buch, loc. cit., PI. I. f. 6, 7» 8. Discites, Id. Ammonites Nceggerathii, 

 Goldf., see Bey rich, Beitrage zur Petref., 1839, p. 24. Tab. nost. XXV. f. I, I a, 1 ^'. 



Shell subdiscoidal, subumbilicated ; volutions rounded on the sides and on the back. Inner edge 

 straight, and a little excavated above the suture. Six or seven apparent volutions, the last envelop- 

 ing two-thirds of the preceding. Shell unknown. Siphon indistinct. Dorsal lobe lanceolate, 



f Goldius Flabellifer de Koninck, Crust. Foss. Belgique, Mem. Acad. Roy. de Bruxelles, tome xiv. 

 —Note, April 1842. 



