4 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [Apr. 6, 



ochraceous, and contains seams of shells (Turritella, Trigonia, and 

 Astarte) ; one large block contained fragments of Ammonites inorna- 

 tus, Will. (=A. insignis, Schliib.), Ammonites Comensis, v. Buch, Go- 

 niomya angulifera, Sow., and two species of Crustacea (Glyphcea, 

 n. sp., and Glyphcea Birdii, Bean); the bed is about twenty feet thick. 



No. 3, the Serpula-bed, a fine-grained greyish-yellow sandstone, 

 which forms a reef, dips gently to the south-east, and presents a low 

 escarpment to the north : it is regularly jointed ; and its exposed up- 

 per surface contains masses of Serpula, Vermetus compressus, "Will., 

 Serpula dipleoca, Bean, Pecten intercostatus, Wr. n. sp., Ammonites 

 Aalensis, Ziet. (var. Moorei, Lye), and a new and remarkable spe- 

 cies of Pseudodiadema, belonging to the group tetragramma. The 

 upper portion of the bed, which is most fossiliferous, is four feet 

 thick ; the lower portion, about six feet thick, contains the same 

 species of fossils, but fewer in number. 



No. 4, the Lingula-bed, or Grey Sandstone, is a soft argillo-mi- 

 caceous sandstone, in parts fissile, and having a bluish-grey colour. 

 This rock is divided by long joints, and forms "scars" at Blue 

 Wick. Its upper, fissile portion is fossiliferous, and contains Lingida 

 Beanii, Phil., Orbicula rejleoca, Sow., and Monotis nitescens, Simp. 

 About the middle of the bed a layer of small nodules occurs ; frag- 

 ments of Crustacea {Glyphma Birdii, Bean, and Glyphcea, n. sp. 

 allied to G. rostrata) are obtained from these nodules. The lower 

 portion is rough and sandy, and passes into hard, argillaceous, nodular 

 layers. The following species are obtained from the sand : — 



Ammonites Aalensis, Ziet. 



Comensis, v. Buch. 



Belemnites compressus, Voltz. 



irregularis, Schloth. 

 Alaria, n. sp., allied to A.Phillipsii, Lye. 

 Cerithium quinquepunctatum, Des- 

 long. 



vetustum, Phil. 



Mytilus scalprum ?, Sow. 

 Pecten Wickensis, Wr. n. sp. 

 Goniomya angulifera ?, Sow. 



Pholadomya fidicula, Sow. 



■ obliquata ?, Phil. 



Monotis nitescens, Simp. 

 Lingula Beanii, Phil. 

 Bhynchonella cynocephala, Eich. 

 Orbicula reflexa, Sow. 

 Terebratula trilineata, Young 8f Bird. 

 Glyphaea Birdii, Bean. 



, n. sp., allied to G. rostrata. 



Pseudodiadema Wickense, Wright, 

 n. sp. 



The hard grey argillaceous nodules which He at the base of the 

 sand and rest upon the Alum-shale have hitherto been referred to 

 that formation. This band of rock, however, contains certain species 

 of Ammonites which are not found in any other stratum on the 

 Yorkshire coast; and it undoubtedly represents the lower series 

 of fossiliferous nodules which lie near the base of the Lias-sands in 

 Gloucestershire. The following species have been collected from the 

 grey nodules : — 



Ammonites Jurensis, Ziet. (gubernator, 

 Simp.). 



insignis, Schliib. 



obliquatus*, Young Sf Bird, 



Beanii, Simp. 



Aalensis, Ziet. 



Ammonites striatulus, Sow. 

 Monotis nitescens, Simp. 

 Goniomya, n. sp. 

 Orbicula reflexa, Sow. 

 Lingula Beanii, Phil. 



* Ammonites obliquatus and A. Beanii only represent different ages of the 

 same species, which is the Ammonites variabilis, d'Orbigny. 



