ENGLISH UPPER SILURIAN OSTRACODA, 145 



frequent ; the rare Primitia cequalis, Octonaria octo- 

 formis vars. intorta and informis, the scarce Macro- 

 cypris Vinei, Bythocypris renifortnis, Bythocypris 

 phaseolus, and Cy there suhquadrata, wei'e obtained 

 here. 



9. Ironbridge Railway- cutting, side of Severn 

 below Benthall Edge, Ironbridge. — Fine yellow 

 shale about 150 feet below Wenlock Limestone. 

 This was the most prolific in Ostracoda of all the 

 Silurian shales examined. No fewer than 57 species 

 and varieties were obtained. In the shale were a 

 few well-rounded quartz-grains, some minute pieces 

 of black scoriaceous lava, small rounded masses of 

 crystalline calcite, clear and opaque crystalline 

 calcite, two small fragments of fish-scales, a small 

 spiral, and a minute Bellerophon. Small Brachiopoda 

 were common, and Crinoids and Polyzoa frequent 



Ostracoda, 57 species and varieties. Beyrichia 

 lacunata was frequent ; and among the other forms 

 of more or less rarity obtained in this sample were 

 Bollia hicollina, B. Vinei, B. auricularis, Strepula 

 concentrica, S. irregularis, Primitia ornata, P. cequalis, 

 Thlipsura plicata var. bipunctata, Octonaria octo- 

 formis vars. simplex , informis, and persona, Moorea 

 Smithii, Macrocypris Vinei, M. (?) alta, Pontocypris 

 Mawii var. gibbera, Bythocypris Hollii, B. botelloides, 

 Cijthere (?) Vinei, and C. (?) subquadrata. 



10. Benthall Edge, Ironbridge.— This has long 

 been a famous locality for Silurian fossils, and is 

 specially mentioned by Murchison in Siluria. The 

 yellow shale here overlies the Wenlock Limestone 

 and contains minute iron pyrites, clear and opaque 

 calcite, small rounded calcite masses, some minute 

 scales of white mica, sulphate of lead, black scoria- 

 ceous lava particles, brownish magnetic particles, 

 small black coprolites, four Lagence, two pearls, one 

 small spiral, an Archceocidaris spine, and a few spicules 

 of Astrceospongia patina, Rcem. The peculiar broken- 

 thread-and-star-like remains of Ascodictyon filiforme, 

 Vine, A. radiciforme, V., A. siluriense, V., and Stoma- 



