312 PALEONTOLOGY. 



from blae clay at Wanganui, and Venus (?) sulcata, from limestone at 

 Napier. R. E., Jun, 



Hyatt, Prof, Alpheus. Two new Genera of Ammonites, Agassiceras 

 and Oxynoticeras. Proc. Boston Soc. Nat. Hist. vol. xvii. pp, 225- 

 235. 



. On the Biological Relations of the Jurassic Ammonites. 



Proc. Boston Nat. Hist. Soc. vol. xvii. pp. 236-241. Abstract in 



Amer. Journ. ser. 3, vol. x. pp. 344-349. 

 Traces the history of the evolution of the Ammonitidse. In account- 

 ing for the perpetuation of the structural differences distinguishing 

 groups, the action of natural selection has been limited by the author 

 to the change of such of them as tend to appear first in varieties, and 

 then by inheritance in larger groups in conformity with the law of 

 " acceleration," by which the structural changes are assumed individu- 

 ally at an earlier and earlier period of existence. G. A. L. 



. The Jurassic and Cretaceous Ammonites collected in South 



America by Prof. James Orton, with an Appendix upon the Cre- 

 taceous Ammonites of Prof. Hartt's Collection. Proc. Boston Nat. 

 Hist. Soc. vol. xvii. pp. 365-372. 

 The following new species are described: — Oaloceras Ortoni, BucJii- 

 ceras (n. gen.) serratum. Other species are referred to. 



James, U. P. Catalogue of Lower Silurian Fossils of the Cincinnati 



Group, found at Cincinnati and Yicinity. New Edition. With 



descriptions of some new Species of Corals and Polyzoa. Pp. 8. 



Printed for the Author. Cincinnati. 



Catalogues the occurrence of 368 species. The following species are 



described as new — Chcetefes (?) calycula, C. clavacoideus, C. Cincin- 



7iatiensis, C.{?) O'Nealli, Alveolites C^) granulosa, Ceramopora Nicholsoni, 



Piilodictya acuminata, and Alecto nexilis. H. A. N. 



Johnson, Hawkins M. On the Organic Structure of Flint and of 

 Meerschaum. Journ. QueTc. Micr. Club, vol. iv. pp. 66-68, 



By staining, with acetate of rosaniline, thin splinters of flints and 

 thin slices of meerschaum, the organic structure of these bodies may be 

 made visible. The latter substance is said to be a fossil sponge ; so 

 also is the pale green substance in Connemara Marble, and the soluble 

 silica rock from the neighbourhood of Farnham, both of which have 

 been examined by the same method of staining. E. T. JST. 



Jones, Prof. T. Rupert, and J. W. Kirkby. Notes on the Palaeozoic 



Bivalved Entomostraca, No. xi. Some Carboniferous Ostracoda 



from Eussia. Ann. Nat. Hist. ser. 4, vol. xv. pp. 52-58, pi. vi. 



Describe a number of Ostracoda from the Carboniferous rocks of 



Russia. Besides previously recorded species, the following are recorded 



as new — Primitia Eiclnvaldi and Cytherella Murchisoniana. Leperditia 



Oheni, var. ohliqua, and Bairdia plebeia; var. munda, are described as 



new varieties. H. A. N. 



