52 



POST-TERTIARY ENTOMOSTRACA. 



12. CuMBRAE College. 



The following succession of beds was found during the sinking of a water-tank 

 (1867) near the College in the Isle of Cumbrae : 



Earthy mould . . . . . 1 ft. 6 in. 



Gravel . . . ..40 



Shell-bearing sand (not pierced through) . .16 



The bed occurs at a distance of 200 yards from the shore, measuring from high- 

 tide- mark. 



On parts of the flat of slightly elevated ground, on which the excavation was made, 

 beds of Nullipore, which is not now found in the neighbouring bay, are met with 

 forming part of an old sea-beach and covered by a few inches of mould. 



The shell-bed contains a large proportion of sand. Taking seven and a half pounds 

 of the dried material, only ten ounces washed away through a sieve of 96 threads 

 to the inch, leaving six pounds fourteen ounces residue. Of this residue one pound 

 is composed of gravel and broken shells, retained in a sieve of -g^-in. mesh. The 

 fragments of rock are sandstone, quartz, trap, and mica-schist, the larger pieces being 

 mostly water-worn, while the smaller are generally angular or partially rounded. Some 

 of the smooth stones appear to have been broken in two, and the fractured surface is 

 entirely unworn. 



Height above the sea thirty-two feet. 



The following Ostracoda were found : 



Cythere castanea, G. 0. Sars. 



— porcellanea, Brady. 



— MacaUana, Brady and Robertson. 



— viridis, Miiller. 



— lutea, Miiller. 



— albo-maculata, Baird. 



— convexa, Baird. 



— clutha, n. sp- 



