l82 NATURAL SCIENCE. March, 



were fairly represented throughout the whole series. In a paper that 

 has recently appeared {Sci. Trans. R. Dublin Society), Jones and 

 Kirkby deal with the Carboniferous Ostracoda of Ireland, and in a table 

 at the end of the work have given their geographical distribution in 

 that island. Much, however, remains to be done before we can 

 correlate the species with those of Britain and the Continent, and learn 

 the true value of the forms, or their value to stratigraphy. A similar 

 paper from these authors, dealing with the Silurian, Ordovician, and 

 Cambrian forms, would be of much service, and would considerably 

 advance the subject. 



Notes on Devonian Ostracoda will be found scattered throughout 

 the series of papers in the Annals above mentioned, and it might be 

 VN^orth some student's while to draw up for the whole Palaeozoic series 

 such a table as is suggested. 



On Mesozoic forms many papers have appeared, the chief of which 

 are those by Jones {Quart. Joiirn. Geol. Soc, 1884), on the Richmond 

 Well ; by Jones and Sherborn (Proc. Bath Field Club, 1888), on the 

 Fuller's Earth; by Jones (Geol. Mag., 1878, p. 103, &c., and 1888, 

 p. 534, &c., and Quart. Journ. Geol. Soc, 1886), on the Purbeck and 

 Wealden ; also Jones and Hinde {PalcBont. Soc, i8go) on the Cretaceous 

 in general. This last monograph was a second and improved edition, 

 so to speak, of Professor Jones' original monograph of 1849, and, 

 besides revising old work, brought the subject right up to date ; a 

 separate paper [Geol. Mag., 1893) by Frederick Chapman and 

 Sherborn, dealing with the Gault of Folkestone zone by zone, 

 completed the history of the Cretaceous forms as known up to that 

 time. Among these Mesozoic Ostracoda there is one single form which 

 seem.s to be an absolutely safe zonal guide, and that is Cypridea 

 granulosa (Sow.) the Cypris fasciculata of Edward Forbes. It has never 

 been found anywhere but in beds of Middle Purbeck Age, and there 

 it occurs abundantly. Those forms with which it is associated pass 

 up or down into the other beds ; more extended collecting, however, 

 may possibly show this species to be more generally distributed. 



The Cainozoic Ostracoda, partly treated by Jones in 1850 [Annals, 

 ser. 2, vol. vi.), were monographed by him in 1857 [P(il^ont. Soc), 

 and a revision of this work by Jones and Sherborn appeared in 1889 

 in the same publication. There are, of course, various separate 

 papers concerning the group, but the information was all collected 

 together in the supplemental monograph of 1889, and references were 

 given to previous literature. The Pleistocene forms received adequate 

 recognition from Dr. G. S. Brady, Mr. Crosskey, and Mr. David 

 Robertson in 1874 [P^l^ont. Soc) ; and the recent world-wide species 

 have been described by the first of these authors in the Challenger 

 Reports, the Transactions of the Zoological Society, and elsewhere ; and 

 those of all Western Europe by G. S. Brady and A. M. Norman in 

 1896 [Sci. Trans. R. Dublin Soc). 



Enough has now been said to give a clue to the literature of the 



