ZONE OF HARPOCERAS BIFRONS. 



129 



Annelida. 



Serpula gordialis, Schlijth. 

 •— limax, Ooldf. 

 — tricristata, Goldf. 



Rhabdocidaris impar, Dumort. 

 Cidaris Dumortieri, Wright. 



Serpula ramentum, Dumort. 



— segmentata, Dumort. 



— lumbricalis, Schloth. 



ECHINODERMATA. 



Pentacrinus jurensis. Querist. 

 Millericrinus Hausmanni, Riim. 



Chondrites Bollensis, Kurr. 



The fragments obtained from washing the bottom clay at Bloxam contained the remains of Ophiuridse 

 ■with the plates and spines of several species of Echinidse. 



Crustacea. 



Bairdia, sp. 



Cristellaria Bronni, Rijm. 



— cultrata, Montf. 



— antiquata, d'Orb, 



— matutina, d'Orb. 



— rhomboidea, Cyek. 



— rotulata, Lam. 



— recta, d'Orb. 



— varians, Born. 

 Dentalina Burgundise, Terq. 



— communis, d'Orb. 



— filiforrais, d'Orb. 



— nummulina, Giimb. 



Cythere, sp. 



FORAMINIFEBA. 



Dentalina obscura, Terq. 



— ornata, Terq. 



— pauperata, d' Orb . 



— quadricostata, Terq. 

 riabellina rugosa, d'Orb. 

 Nodosaria raphanistrum, Terq. 



— Badenensis, d'Orb. 

 Planularia harpula, d'Orb. 



— pauperata, J. ^ P. 



— reticulata, Corneil. 

 Lingulina teuera, Born. 

 Vaginulina striata, d' Orb. 



In Rutland the Serpentinmn and Bifrons zones approach so close together that their 

 fossils in many cases cannot be separated. The Serpentinicm-zawQ, with its " Fish-bed and 

 Insect limestone," appears to be the one most fully developed in this county. 



In North- West Lincolnshire the Rev. J. E. Cross, F.G.S.,^ has noted the Upper 

 Lias in the Santon Railway-cutting, and collected therefrom Harpoceras serpentinum, 

 Stephanoceras commune, Lytoceras cornucopia, and Amaltheus spinatus. 



Foreign Correlations. — The Upper Lias in South-west Germany Was divided by 

 Professor Quenstedt" into PosidonienscJiiefer and Jurensis-Mergel ; the former corre- 

 sponding to the Serpentinum and Bifrons zones, and the latter to the Jurense and Opalinum 

 zones of this work. The " PoisidonienscJiiefer" are characterised by the presence of 

 Fish, as Ptycholepis Bollensis, Eugnatlms, Tetragonolepis, Pholidotus semicinctus, Lepi- 

 dotus Elvensis, semiserratus, dentatus, Semionotus leptocephalus, Aspidorynclius, Pachy- 



1 'Quart. Journ. Geol. Soc.,' vol. xxi, p. 124, 1875. 

 - 'Flozgebirge Wiirtembergs,' p. 539, 1843. 



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