Fossil Fishes. 49 



mopor a fibrosa, Goldf.. and some other corals. Tliis subdivision is 

 remarkably well developed near Aymestry in Herefordshire, in some 

 parts of Shropshire, and at Sedgley in Staffordshire. The third and 

 last subdivision is that of the lower Ludlovf rocks ; these are con- 

 cretionary and sandy limestones, and sandy shales of a dark color ; 

 and are especially developed in the escarpments of Monktree and 

 Bridgwood in the valley of Woolhope in Herefordshire, in the escarp- 

 ments, in Montgomery and the Radnor Forest and are characterized 

 by three species oiPhragmoceras (a nevi^ genus of Mr. Broderip), by 

 the As aphus caudatus, Brong. ; two species of CardioJa (neu^ genus 

 of Bron.), a new species of Nautilus, two of SpiraUtcs, a Penfamerus, 

 the Atrapa galeata, Dalm., a new species of this same genus, one of 

 Pleurotomaria, the Orthocera pyriformis, and many other fossils. 

 The teeth of fishes have also been found in this formation, thoueh 

 not in great numbers, and lying most commonly in the upper Lud- 

 low rocks. No part of the body of a fish was ever discovered in this 

 formation till this present year, when the upper beds being removed 

 at Ludford, in digging the foundation of some houses, a heap of 

 scales were discovered, as also the rays of fins, and teeth completely 

 broken lying huddled together, and forming a bed between the strata 

 of sandstone which contain an immense number of Serpulje also, 

 Leptana lata, and of other fossils which characterize this formation. 

 "These fragments are too incomplete, to enable us at the present 

 moment to arrange them in a systematic table of classification. It is, 

 however certain, that they do not present any specific analogy to the 

 fishes of the old red sandstone formation. Tlie remains of the fins 

 belong to a different species of Ichthyodorulites, and the scales ap- 

 pear to belong to different fishes of the family Lepidoidians, for 

 their appearance is very varied ; the teetlj, moreover, are less nu- 

 merous, and none have been found entire. The nature of these stra- 

 ta, their disintegrated condition, and the fossils v/hich they contain, 

 have, altogether, led Mr. Murchison to suppose that they have been 

 deposited in very shallow waters. Only a very few Ichthyodorulites 

 have been found in the louer Ludlow rocks ; and since Mr. Murchi- 

 son has not collected them himself, he thinks that their presence in 

 this subdivision should be admitted with some degree of hesitation ; 

 and the more so, as they have not been found in the Aymestry h"me- 

 stone, which contains such an immense quantity of organic debris, 

 and amongst others of the Pentamerus. 

 Vol. XXIX.— No. L 7 



