18 



4th, A tortuous or meandering track consisting of a slightly raised 

 ridge about one-tenth of an inch wide, with a fine linear groove on 

 each side. These tracks are analogous to those formed by the 

 crawling of small annelidous worms, as may often be seen on the 

 mud of the sea or fresh water. 



About eleven feet above the stratum which presents the impres- 

 sions above described, a second ossiferous bed occurs at Wainlode 

 CliiF, which escaped Mr. Strickland's notice in the section formerly 

 given (Geol. Proc. vol. iii. p. 586). It is a band of hard, grey, 

 slightly calcareous stone, about an inch thick, containing a plicated 

 shell resembling a Cardium, and scales and teeth of Gyrolepis tenui- 

 striatus, Saurichthys apicalis, Hybodus Delabechei, Acrodus minimus, 

 and Nemacanthus monilifer, all of which occur in the true " bone- 

 bed" below. On the upper surface of that bed are numerous im- 

 pressions, termed by Mr. Strickland fucoid, consisting of lengthened 

 vninkled grooves, variously curved, about three quarters of an inch 

 wide, one-eighth of an inch deep, and of variable length. The 

 bone-bed seems to be a local deposit, not being met with in the 

 other localities examined by the author, and being confined to a 

 portion only of Wainlode Cliff, where it constitutes No. 9. in the 

 following corrected section : — 



Ft. in. 



1 . Blackish lias clay 3 6 



2. Limestone, with Ostrea and Modiola mini- 



ma (the bottom bed) 4 



3. Yellowish shale 1 



4. Limestone, with remains of insects 4 



5. Marly shale and clay 5 3 



6. Yellowish limestone nodules, with occasional 



remains of Cypris 6 



7. Yellowish marly clay 6 



8. Black laminated clay 3 6 



9. Stone, with scales and bones of fish, and on 



the upper surface fucoid impressions. ... 1 



10. Black laminated clay 1 6 " 



11. Slaty calcareous stone, with Pectens 4 



12. Black laminated clay 9 



13. Bone-bed and white sandstone, with casts 



of Pullastra arenicola 3 



14. Black laminated clay 2 



15. Greenish angular marl 23 



16. Red marls with greenish zones 42 



98 7 



towards the margin. The apex is about halfway between the middle of the 

 shell and the anterior end. The general outline closely resembles that of 

 the recent Pullastra aurea of Britain. Maximum le;ogth 7 lines, breadth 

 4^ lines, but the ordinary size is less." 



