Miscellaneous. 187 



nasiil bones; the leeth, implanted in distinct sockets, have sub- 

 coiuprcssed, recurved, conical, pointed crowns, with minutely crenu- 

 lated borders. The foremost tooth in tlie maxillary i^ a canine ; and 

 in other ])oints the dentition shows Theriodont characters. This 

 fossil has been described by Dr. Leidy under the name of Bathy- 

 ynathus borealis. Thus, supposinjif the atKnities of the fo.ssils from 

 the Oural and Prince-Edward Island to be correctly determined, 

 the Reptilia distinguished by Mammalian characters arc shown to 

 have had a very wide range. Further, the author thinks that the 

 Theriodont Reptiles of the Bristol Dolomitic Conglomerate may also 

 prove to constitute a family in the Theriodont order. 



MISCELLANEOUS. 



Parkeria inferred to hcire been a Species of Hydractinia. 

 By H. J. C.\RT£R, F.R.S. &c. 



To the Editors of the Annuls and Magazine of Natural History. 



Gentlemen, — Having lately received, again through the kind- 

 ness of my friend Mr. W. J. Stdlas, several si)ecimeus of Parkeria 

 from the Cambridge (ireensand, my attention has been directed to 

 their structure, which so closely resembles that of the Hydractiniidae 

 that a parity of organization between the two may be fairly in- 

 ferred, the particulars of which T hope to communicate to you on a 

 future occasion. I am, Gentlemen, 



London, Yours faithfully, 



July 20, 1870. Hknry J. Carter. 



On Saccharomyces cerevisise. By MM. Francisco Quiroga r 

 RoDRiGVEz and Enrique Serrano y Fastigati. 



The resumption of our experimental researches upon the influence 

 exerted by various agents and the combination of different conditions 

 upon the various inferior organisms has led us to the study of these 

 influences upon beer-yeast. Our observations were made with the 

 same Verick microscope which we used in our investigations of 

 blood, and giving an amplification of 780 diameters. The number 

 of ob-servations and measurements has been 46o, made upon 126 

 different preparations. 



The results obtained are as follows : — 



\. In all the preparations made, at the end of five or six days, 

 with the Sacrharoinyees placed in distilled water and exposed freely 

 to the air, light, and suiTounding temperature, or in solut uns of 

 various phosphates and chloride of ammonium, or placed un ler the 

 same conditions as the preceding after desiccation, wo have o tserved 

 an infinite number of more or less spherical yellowish cor miscIcb, 

 tn no case exceeding in diameter the thousandth of n millimetre, 



