486 ME. F. CHAPMAN AND PROF. T. R. JONES [Aug. 1896, 



A Pliocene, post-Tertiary, and recent freshwater species. 

 Frequent, Barry Dock. 



4. Candona lactea, Baird. 



Candona lactea, Brady and Norman, 1889, Sci. Trans. R. Dublin 

 Soc. ser. 2, vol. iv. p. 100. 



A post-Tertiary and recent freshwater species ; Great Britain 

 and Europe. 



Frequent ; Barry Dock. 



5. Darwintjla Stevensoni, Brady and Robertson. 



Darwin ella Stevensoni, Brady and Robertson, 1874, Monogr. post- 

 Tert. Entom. (Pal. Soc.) p. 141, pi. ii. figs. 13-17. 



Darwinula Stevensoni, Brady and Norman, 1889, Sci. Trans. R, 

 Dublin Soc. ser. 2, vol. iv. p. 122, pi. x. figs. 7-13. 



A Pliocene, post-Tertiary, and recent freshwater species ; Great 

 Britain and Europe. 



Common ; Barry Dock. 



6. Limnicythere inopinata (Baird). 



Limnicythere inopinata, Brady, 1868, Trans. Linn. Soc. vol. xxv, 

 p. 419, pi. xxix. figs. 15-18, pi. xxxviii. fig. 9, pi. xxxix. fig. 1. 



This strikingly sculptured species is a post-Tertiary and recent 

 form ; inhabiting fresh and estuarine waters, and found sometime* 

 in seawater near the coast. 



Very common ; Barry Dock. 



7. Cytheridea torosa (Jones), var. teres, Brady and Robertson. 



C. torosa, var. teres, Brady and Robertson, Ann. Mag. Nat. Hist, 

 1870, ser. 4, vol. vii. pp. 21, 22 ; Brady, Crosskey, and Robertson, 

 1874, Monogr. Post-tert. Entom. p. 178, pi. vii. figs. 1, 2. 



This variety is distinguished from the type by the absence of the 

 knobs so conspicuous in 0. torosa. The specimens here under 

 notice vary very much in size, measuring -^ tOyL inch (0'42 mm. to 

 1*38 mm.) in length. The external surfaces of the valves are 

 marked with minute pittings, disposed in a somewhat concentrically 

 lineate manner. The usual transverse median sulcus is well-marked 

 in nearly all the specimens, but it is better developed in the larger 

 individuals. There is a short stout spine on the margin of the right 

 valve at the posterior ventral angle. The valves of the male are 

 narrower and more elongate than those of the female. 



Previously known as a Pliocene, post-Tertiary, and recent fresh- 

 water and estuarine form ; Great Britain and Europe. 



Very abundant ; Barry Dock. 



(3) From the Clay above the Lowest Peat (No. 10 of p. 481). 



1. ClTHERE PELLTJCIDA, Baird. 



C. pellucida, Brady and Norman, 1889, Sci. Trans t R. Dublin 

 Soc. ser. 2, vol. iv. p. 126, pi. xiv. figs. 13-15. 



