THE 



QUARTERLY JOURNAL 



OF 



THE GEOLOGICAL SOCIETY OF LONDON. 



Vol. XLVI. 



1. On some Pal.eozoic Osteacoda from jNorth America, Wales? 

 and Ireland. By Prof. T. Rupert Jones, E.R.S., F.G.S. 

 (Read November 6, 1889.) 



[Plates* I.-IY.] 



Introduction. — 1. Some good specimens of jNorth-American Ostracoda 

 from the Lower- Helderberg and Cincinnati Groups, in the British 

 Museum and my own collection, have given occasion for a critical 

 revision and careful illustration of several forms shown in PI. III. 

 figs. 1-20, 24, 25, and PI. IV. figs. 16-24. Eor comparison with 

 some of these, three Russian specimens (PI. III. figs. 21-23) are 

 introduced. 



2. In the ' Palaeontology of New York,' vol. iii. 1859, several of 

 the Palseozoic Ostracoda of New- York State were described, but 

 pis. 79 A and 79 b, intended to contain figures o'f some of 

 them, could not be then produced. With Dr. James Hall's per- 

 mission, copies of some of the original drawings have been cour- 

 teously supplied by Mr. J. M. Clarke, of Albany, and are hero 

 reproduced (PI. I. tigs. 1-6, and woodcut, fig. 1), thus enlarging our 

 knowledge of the Lower-Helderberg fauna by the illustration of seven 

 out of the ten forms originally intended for the unpublished plates f. 



3. Prof. R. P. Whitfield, of New York, having kindly sent a 

 large series of Palaeozoic Ostracoda, collected in the Lake-Champlain 

 district and elsewhere in North America, for examination, they are 

 illustrated in PI. I. figs. 7-15, and PI. II. figs. 1-13. Figs. 7-10 

 and 15 of PI. I. are from the Lower Silurian of Lake Champlain ; 

 PI. I. fig. 12 and PI. II. figs. 1 and 6 are from the Upper Silurian 



* These Plates have been drawn with the aid of a Grant from the Koyal 

 Society.- 



t Onlj "Lepcrdltia panmla," o2y.oit. p. 370, pi. 71) a, figs. 9 «, ^, remains 

 now unrepresented. 



a. J. G. S. No. 181. B 



