102 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



[Jan. 8, 



Belgium. — (From De Koninck.) 

 Helodus laevissimus, Ag. 

 Orodus ramosus, Ag. 

 Psammodus porosus, Ag. 

 rugosus, Ag. 



Germany. 



Psammodus rugosus, Ag. 



North America. — (Lord Enniskillen.) 

 Psammodus porosus, Ag. (Warsaw 



in Illinois.) 

 Psephodus magnus, Ag. 

 Cladodus. 



EussiA. — (From E, d'Eichwald.) 

 Cladodus mirabilis, Ag. 

 Cochliodus contortus, Ag. 

 Ctenoptychius denticulatus(?), Ag, 

 Dicrenodus Okensis, Rom. 

 Helodus gibberulus, Ag. 



laevissimus, Ag. 



Hybodus polyprion (?), Ag. 



Panderi, Eichw. 



Leptacanthus remotus, Eichw, 

 Petalodus acuminatus, Ag. 

 Poecilodus Eossicus, Keys. 

 Psammodus porosus, Ag. 



For revising this list, and for much assistance in correcting the 

 names of the species examined by M. Agassiz during his last visit 

 to England in 1859, we are greatly indebted to the Earl of Ennis- 

 killen and Sir Philip Egerton. In explanation of the changes in 

 many names of genera and species referred to in the Table, we have 

 been favoured by these gentlemen with the following notes : — 



Found at Is now the 



Cochliodus magnus Bristol Tomodus convexus. 



C. magnus Armagh, Richmond, and 



Kendal Psephodus magnus. 



C. acutus Armagh Deltoptychius acutus. 



C. acutus Bristol D. gibberulus. 



C. oblongus Armagh Streblodus oblongus. 



C. oblongus Hook Point, Co. Wexford . 8. Egertoni. 



C. oblongus Armagh S. Colei. 



C.striatus -f^'^^^u Xystrodus striatus. 



1_ Armagh A. angustus. 



Glossodes lingua-bovis Agassiz supposes to be the front tooth of Helo dus 

 didymus ; but he has taken the specimen to America. 



Helodus planus is now merged into Psephodus magnus, 



rudis is supposed by Agassiz to be a young tooth. . 



Orodus ramosus occurs also in Monmouthshire. 



Petalodus acuminatus and P. HastingsicB are said to be of the same species ; if 

 80, the name must remain P. Hastingsice. The locahties for this species are 

 Richmond in Yorkshire and Ticknall in Derbyshire. It is not found at 

 Armagh. 



Petalodus radicans is now Polyrhizodus radicans ; and Petalodus rectus is a 

 young tooth of the same species. 



Petalodus psittacinus is now Petalorhynchus psittacinus. 



Poecilodus sublcevis „ Deltodus sublcevis. 



P. parallelus is a second tooth of the above species. 



P. transversus is half a tooth of Poecilodus Jonesii. 



Pristodus falcatus is a new genus and species from Mr. Wood's collection. 



Psammodus canaliculatus is now merged into Psammodus porosus and rugosus. 



Psammodus rugosus. The type-specimen of the genus is from Eskey, Co. Sligo. 



P. cornutus is now subdiArided into the following genera and species : — 



Characodus angulatus Armagh. 



C. cuneatus „ 



Copodus cornutus ,, 



C. furcatus ,, 



C. lunulatns „ 



C. spatulacus ,, 



Dimyleus Woodii. . . Richmond, Yorks. 



Labodus planus Armagh. 



Labodus prototypus Armagh. 



Mesogomphus lingua „ 



Mylacodus quadratus „ 



Mylax batoides ,, 



Pinacodus gelasinus ,, 



P. gonoplax „ 



Pleurogomphus auriculatus „ 



Rhymodus transversus .. . ,, 



