SUPPLEMENTARY APPENDIX. 125 



continental fossil, similar to that I had already formed of the English and Irish specimens, 

 and which though I cannot advance as a discovery, I can yet confirm so far. To o-ive 

 Herr Beyrich full credit for his penetration, I subjoin his remarks (loc. cit. p. 47), and 

 have great pleasure in naming the genus after him. ' Baftus tubcradalus, Klöden, welchen 

 Burmeister als synonym zu Odontoplciira omtu citirt, ist weder ein Battus nocht überhaupt 

 ein Trilobit. Er hat ein zweiklajjpige Schale, deren Oberfläche mit ganz unsymmetrisch 

 geordneten Lappen und Tuberkeln bedeckt ist, und muss eine besondere Gattung neben 

 Cytherma bilden.' 



" The Af/nostus Mus of the American geologists from their ' Clinton group,' also belono-s 

 to this genus. The species I propose naming after its original discoverer, Bcijrichia 

 Klodeniy (Loc. cit. p. 58.) 



The Cythere jjliaseolus of Hisinger is enumerated among Irish Silurian fossils in the 

 same work. 



IV. The following new Trilobites and Entomostraca are described and figured by Mr. 

 Salter in the work of Professor Sedgwick, already mentioned.* 



Cheirurus juvenis. 

 Cybele sexcostata. 

 Calymene tuberculosa. 



llhenus Davisii. 



Bowmanni. 

 Asaphus elevatus. 



Homalonotus bisulcatus. parvifrons. 



rudis. Lichas (nodulosus) 



? Cephalaspis. Ogygia radiata. 



Dahuannia aifinis. Agnostus trinodus. 



obtusicaudata Beyrichia complicata. 



Phacops apiculatus Beyrichia plicata, 



felinus. Cythere umbonata. 



alifrons. Cypridina strangulata 



V. From the treatise ' Ueber einige böhmische Trilobiten,' by Dr. Ernst Beyrich (1845), 

 referred to by Professor Burmeister more than once, we have extracted the following generic 

 characters of Cheirurus, Sph.erexochus, Lichas, and Trochurus. 



Cheirurus. Caput ambitu semi-orbiculari, limbo prsecinctum, testa tectum granulosa 

 in glabella, scrobiculosa in genis. Suturse faciales ab oculis postice ad marginem exteriorem, 

 antice sejunctse ad marginem ductae. Oculi parvi. Sulcus occipitalis profundus, prope 

 angulos cum sulco marginali confluens. Glabella magna, lata, usque ad limbum marginalem 

 porrecta, frontem versus dUatata. Sulci laterales glabella; tres distincti ; posteriores versus 

 ad sulcum vertiealem retrorsi ; medii et anteriores ssepius conjuncti, recti vel parum 

 retroversi. Alse occipitales scuti centralis latae ; scuta marginalia parva. 



Thorax ex articulis, undecim. Rhachis arcuata, versus pygidium coarctata, trans- 

 versim annulata. Pleurse sulco transversal! in partem interiorem minorem et exteriorem 



* In the forthcoming (the second) volume of the Memoirs of the Geological Survey of England and 

 Wales, now in the press, a new species of Olcints is described by Professor Phillips, under the name of 

 O. Iiumi/is, and a new A»ipi/x, named by Professor E. Forbes, A. purvuhm. 



