ENGLISH UPPER SILURIAN OSTRACODA. 153 



locality was of a yellowish colour, with a large 

 quantity of calcite. There were a few well-rounded 

 quartz-grains, some minute mica-scales, and particles 

 of black scoriaceous lava. Crinoids and Polyzoa were 

 common ; and there were also obtained four small 

 black coprolites, some small Brachiopoda, four La- 

 gence, eight pearls, and two spicules of Hyalostelia 

 gracilis, Hinde. 



Ostracoda, 7 species, including Beyrichia Maccoyiana 

 and Sfrepula concentrica. 



31. Bock, near Mayhill, Gloucestershire. — The 

 Silurian Limestones in the Mayhill district are said 

 to be in the aggregate 550 feet in thickness. The 

 fine yellowish shale from here contained some 

 rounded concretions of calcite, minute cubical iron 

 pyrites, some scales of brown mica, some exceedingly 

 minute scales of white mica ^Ify of an inch in size, 

 one spiral, three small black coprolites, small 

 Brachiopoda (frequent), Crinoids and Polyzoa (com- 

 mon), a bone of an Ay'ciiceocidaris, and one pearl. 



Ostracoda, 16 species, including Beyrichia tuber- 

 culata var. suhtorosa with big lobe (common), the 

 wide-spread Xestoleberis corbuloides (common), Bytho- 

 cypris ? reniforTuis (scarce), B. concinna (scarce), and 

 B. phaseolus (scarce). ^ 



32. Longhope, Gloucestershire. — Quarry about a 

 mile east from station. The shale here was yellowish, 

 and contained plenty of microzoa. The mineral 

 particles dispersed through the fine shale were small 

 aggregates of crystalline calcite, black fragments 

 of scoriaceous lava, and some brown mica. The 

 organic remains consisted of one spiral, fragments 

 of Trilobites, small Brachiopoda (frequent), Polyzoa 

 (common), Crinoids (scarce), a minute black coprolite, 

 and a tooth of Archceocidaris. 



Ostracoda, 22 species. Beyrichia Kloedeni var. 

 suhtorosa was especially common, and of a fine 

 yellowish-brown colour ; many of the valves showed 

 the interior, and five examples with the big lobe 

 were obtained. Among the other species in this 



