ENGLISH UPPER SILURIAN OSTRACODA. 157 



44. Quarry one mile north--we8t from Wenlock. 

 — This was a sample of the rotted Wenlock Lime- 

 stone, and contained a great many Crinoid remains 

 and numerous minute pearls. The pearls we have 

 noticed are more or less common in both the lime- 

 stones and shales. They are of a concentric-laminated 

 structure, translucent, and generally contain alminute 

 nucleus. Some are silvery-white, some yellowish, 

 and others of a fine amber colour when viewed by 

 transmitted light. They all have a peculiar] pearly 

 lustre, and are sometimes joined together in twos 

 and threes. I have a Carboniferous pearl from 

 Brockley shale, but it is very much larger than any 

 of the Silurian examples. In no case have Il^fouud 

 them attached to the remains of any animal that 

 we might suppose to have secreted them. I may 

 say that in no Silurian rotted limestone have I 

 detected Ostracoda; but in some of the Carbonifer- 

 ous rotted material they are sometimes pretty 

 common. 



45. Priory Sedgley. — The yellowish shale from 

 above the Aymestry Limestone in this locality 

 contained many angular quartz-grains, a quantity of 

 well-rounded quartz-grains, small rounded masses of 

 calcite, some white mica, and a few brownish 

 magnetic particles. The larger fossils were very 

 scarce, and only a few rolled Crinoid remains and 

 fragments of Polyzoa turned up in this washing. 

 As in most of the Aymestry shales, pearls appear 

 to be common, 15 specimens being obtained. 



46. Longhope, near Rail-way Station (Aymestry 

 Shale). — This was a yellowish sandy shale, and con- 

 tained white and brown mica, small white aggregates 

 of calcite, some white crystallised and fibrous cal- 

 cite, rock milk? brownish magnetic particles, some 

 particles of black scoriaceous lava, 7 pearls, and a 

 few rolled fragments of Polyzoa. 



47. White Cliff, Ludlow.— The cliff is on the 

 opposite side of the river from the town ; and the 

 rock is a fine-grained sandstone containing a con- 



