ZONE OF AMMONITES CAPRICORNUS. 



81 



CoNCHIFERA. 



Pliolndomya ambigua, Sow. 



— decorata, Ilartm. 



Pleurouiya unioides, R'oin. 

 Leda rostralis, Lamk. 



— complanata, R'vm. 



— acuminata, Goldf. 



— cordata, Goldf. 



— inflexa. Rum. 

 Astarte capricorui, Wr. 



j\Iytilus hi[)pocampas, Youny and Bird. 

 Cypricardia cucullata, Goldf. 

 Cardinia attenuata, Stntch. 

 Goniomya capricorni, Wr. 

 Cardium truncatum, Phil. 

 Unicardium Jantlie, d'Orhig. 

 Cucullsea Munsteri, Ziet. 



Area elongata, Quenst. 

 — truncata, Buck. 

 Modiola scalprum, Sow. 

 Limea acuticosta, Gold. 

 Avicula longiaxis, Buck. 

 Monotis insequivalvis, Sow. 

 Inoccramus vcntricosus, Sow. 



— substriatus, Goldf. 

 Pecten Bequivalvis, Sow. 



— priscus, Schloth. 



— diversus, Buck. 



— liasiiius, Nyst. 

 Gervillia laevis, Buck. 

 Plicatula spinosa, Sow. 

 Gryphaea cymbium, Lam. 

 Ostrea. 



Terebratula punctata, Sow. 

 Spirifer rostratus, Schloth. 

 Khynchonella rimosa, von Buch. 



Brachiopoda. 



Rynchonella variabilis, Schloth. 

 Orbicula scaliforme, Wr., n. sp, 

 Lingula Beanii, Phil. 



ECHINODERMATA. 



Cidaris Edwardsi, Wr. 



Acrosalenia, sp. 



Pedina, sp. 



Uraster Gaveyi, Forb. 



Tropidaster peetiuatus, Forb. 



Ophioderma Gaveyi, Wr. 

 Ophioderma Brodiei, Wr. n. sp. 

 Pentacriaus robustus, Wr. 



— punctiferus, Quenst. 



— subangularis, Mill. 



On the coast of Yorkshire, as at Staithes, Boulby, and Skinningrave Bay, where the 

 Marlstone series is admirably exposed, the shales with Ammonites macidatus {capricorniis) 

 form the base of the cliffs. "This Ammonite," observes Mr. Hunton,' "is constantly 

 found at the junction of the Marlstone with the Lower Lias (zone of A. capi-icoi-nus), 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. Haivskcrensis at Hawskerbottoms), yet 



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



11 



