NOTES AND MEMORANDA. 161 



of Dr. Elias Metschnikoff on this subject. It fills nearly 40 pages 

 of Siebold and Kolliker's ' Zeitschrift,'* and is illustrated by four ad- 

 mirably choice plates. The development of the scorpion has been 

 pursued from the very earliest stage of the ovum through all the series 

 of changes by which it reaches the adult condition. These are very 

 many in number, and deserve to be carefully studied by those interested 

 in these animals. 



Mitraria and Actinotrocha. — The above author has contributed 

 also to the same journal as the above, a very valuable paper on these 

 two species. He goes into the question of their development, and 

 affords a very excellent plate in illustration. It is quite out of our 

 power to produce such plates as these in this country. 



Development of the Badiolaria. — Dr. W. Ddnitz gives an excellent 

 paper on this subject in the 'Archiv fiir Anatomie.'f The plate 

 illustrating the author's remarks has been very carefully drawn. 



Structure of the Chorda dorsalis. — A very long and important paper 

 on this subject will be found in the ' Zeitschrift fiir Medicin,' &c.,J 

 by Wilhelm Miiller. Indeed the whole number, which is a special 

 one, is by him, and it contains several very valuable contributions. 



The Structure and Nature of Diatomacece. — This is an interesting 

 paper contributed to the Vienna Academy by Dr. Adolf Weiss, and 

 published with two plates in the ' Sitzungsbericht,' § It deserves 

 perusal by some of our microscopists devoted to minute structure. 



Mediterranean Bryozoa, by Dr. Manzoni, is another good paper 

 also in the same number of the Vienna Transactions. 



On the Development of Plant-organs. — This is likewise a paper in 

 the same number of the Vienna Journal. It is by H. Leitgeb, and is 

 of considerable importance. It goes minutely into the question of 

 what particular cells go to form special parts. In fact it relates to the 

 development of the whole plant. There are four plates of engravings 

 accompanying the paper. 



NOTES AND MEMOKANDA. 



Royal Microscopical Society. Addresses Wanted. — It is believed 

 that the following gentlemen no longer reside at the addresses given 

 in the last edition of the ' Eoyal Microscopical Society's List of Fel- 

 lows,' and as a new edition is in preparation, they are requested to 

 forward to the Assistant-Secretary, Mr. Walter W. Eeeves, King's 

 College, London, their present address as early as possible. Should 

 they be abroad and this request be not likely to come under their 

 notice, perhaps some friend will be kind enough to give the required 



» Band 21, Heft 2. f Reichert and Du Bois-Reymond, 1871, Heft 1. 



X Band 6, Heft 3. § LXIII. Band 1 and 2 Heft. 



