Reviews — Recent Papers on Palwozoic Ostracoda. 559 



plates with numerous figures in each, rather rough in execution, but 

 sufficiently true in essential features. 



II. — Jones, T. E.., in the Contributions to Canadian Micro- 

 Palgeontology, part iii. 1891, pages 57-99, plates x.-xiii. describes : — 

 1. Fifteen species and varieties of Ostracoda from the Cambro- 

 Silurian of the Provinces of Ontario and Quebec and of Lake 

 Winnipeg, thirteen being new ; 2. Nineteen from the Silurian of 

 Anticosti and the Saskatchewan district, including ten new forms ; 

 3. Nine from the Devonian of Lake Winnepegosis, the Athabasca 

 River, Ontario (Thedford), and the Hay Eiver near the Great Slave 

 Lake, six being new. The close alliance of so many forms generically 

 and specifically is noticed, and the varietal links defined ; more 

 especially the earlier representative forms or predecessors of species 

 flourishing at a later period. Such predecessors, if not directly and 

 genetically related, certainly occur in older deposits. 



Thus the well-known Trenton species Leper ditia fabulites and 

 Louckiana are scarcely distinguishable from some forms of the later 

 Silurian L. Hisingeri ; and L. labrosa is very close to L. margiuata 

 of the same date. Even L. balthica has a corresponding form, of 

 little difference, in the Chazy, here designated var. primceva. 



Other North-American Ostracods were desci'ibed and figured in 

 the Quart. Journ. Geol. Soc. 1890, pages 1-31, plates 1-4, and 

 pages 533-556, plates 20-21. It may be noted that — (1) " Primilia 

 Morgani," p. 5, pi. 4, fig. 6, is now JJlrichia ; (2) " Beyrichia 

 Bnchiana'i" at page 16, pi. 3, fig, 25, is probably an imperfect 

 specimen of Ulrich's B. persulcata', (3) ^'Beyrichia Clarhei" at 

 page 17, woodcut fig. 2, is almost, if not quite, a Bollia; (4) The 

 new genus proposed by Mr. Ulrich for B. ciliata {note, p. 19) and its 

 allies is Ctenobolbina ; (5) "fig. 17" at p. 27, 3rd Ime from the 

 bottom, should be " fig. 12 " ; (6) " Primitia Walcotti," p. 543, wood- 

 cut fig. 1, agrees with Mr. Ulrich's genus Barychilina ; (7) The 

 Canadian specimens enumerated at pages 550-554 have been de- 

 scribed in detail, together with others, in part iii. of the "Contributions 

 to Micro-Palseontology," 1891. 



III. — Krause, a. — Wissenschaft. Beil. Programm Luisenstadt. 

 Oberrealschule, Berlin, 1891 ; and Zeitsch. Deutsch. geol. Gesell. 

 1891, pages 488-521, plates 29-33. The Ostracoda found in the 

 Silurian rocks of the gravel-drift of North Germany, as determined 

 by the author and others, are here enumerated ; and forty-six species 

 are critically noted and figured. In a comprehensive Table of these 

 North-German fossils (pp. 514-521) 84 species (20 of them new), 

 besides several varieties, belonging to 18 genera, are enumerated, 

 and their distribution shown according to — 1. Their association with 

 certain typical species of Strepula and BeyricJiia : 2. Their occurrence 

 in three kinds of Lower-Silurian rocks (27 species) : 2. In three 

 Upper-Silurian rocks (57 species) : 4. Occurrence in the Prussian 

 districts : 5. The probable origin of some species from Sweden and 

 the Baltic Provinces. 



T. E. J. 



