ZONE OF AMMONITES CAPRICORNUS. 



81 



CONCIIIFERA. 



Pholadomya ambigua, Sow. 



— decorata, Ilartm. 

 Pleuroniya unioides, Rom. 

 Leda rostralis, LamJc. 



— complanata, Rom. 



— acuminata, Goldf. 



— cordata, Goldf. 



— inflexa, Rom. 

 Astarle capricorni, Wr. 



Mytilus hippocampus, Toung and Bird. 

 Cypricardia eucullata, Goldf. 

 Cardinia attenuata, Slufch. 

 Goniomya capricorni, IF r. 

 Cardium truncatum, Phil. 

 Unicardium Janthe, d'Orhig. 

 Cucullsea Miinsteri, Ziet. 



Area elongata, Quenst. 

 — truncata, Buck. 

 Modiola scalprum, Sow. 

 Limea acuticosta, Gold. 

 Avicula lougiaxis, Buck. 

 Monotis insequivalvis, Sow. 

 Inoceramus ventricosus. Sow. 



— siibstriatus, Goldf. 

 Pecten eequivalvis. Sow. 



— priscus, Schloth. 



— diversus. Buck. 



— liasinus, Nyst. 

 Gervillia Isevis, Buck. 

 Plicatula spinosa. Sow. 

 Grypliaja cymbium, Lam. 

 Ostrea. 



Brachiopoda. 



Terebratula punctata. Sow. 

 Spirifer rostratus, Schloth. 

 Rhyncbonella rimosa, von Buch. 



Ryncbonella variabilis, Schloth. 

 Orbicula scaliforme, Wr., n. sp. 

 Lingula Beanii, Phil. 



ECHINODERMATA. 



Cidaris Edwardsi, Wr. 



Acrosalenia, sp. 



Pedina, sp. 



Uraster Gaveyi, Forb. 



Tropidaster pectinatus, Fori). 



Ophioderma Gaveyi, Wr. 

 Ophioderma Brodiei, Wr. n. sp. 

 Pentaerinus robustus, Wr. 



— punctiferus, Quenst. 



— subangularis, Mill. 



Oil the coast of Yorkshire, as at Staitlies, Boulby, and Skinningrave Bay, where the 

 Marlstone series is admirably exposed, the shales with Ammonites maculatm {capricornus) 

 form the base of the cliffs. "This Amoionite," observes Mr. Huntoii,' "is constantly 

 found at the junction of the Marlstone with the Lower Lias (zone of A. capricornus), which 

 here pass so gradually into each other that it is impossible to determine where the 

 sandstones end and the blue shale begins. I have long sought for A. maculatus, Y. & B., 

 {capricornus, Schloth.) in the upper and central portions of the Marlstone, but have never 

 found it many feet above the junction beds ; and though this and other Ammonites from 

 unequal geographical distribution may be more abundant in one place than in another 

 [A. maculatus is in greatest number at Staithes, A. Hawskerensis at Hawskerbottoras), yet 



1 'Trans. Geol. Soc.,' second series, vol. v, p. 218. 



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