1887.] NEW-YORK MICROSCOPICAL SOCIETY, 53 



Being interested in these movements I amputated a great 

 many legs, looked at them in a variety of ways, and became 

 convinced that the means of attachment was exhaustion of air. 

 Finding no authority on this subject, I have some hesitation in 

 giving my own conclusions, but do so in the hope that, if I am 

 in error, some member, better informed than myself, will correct 

 me. It seems to me that the pulvillus between the ungues is 

 bell-shaped, but has a rounded, or cushioned cover, which is 

 tightly shut when suction is not required. The pulvilli at the 

 extremity of each tarsal joint have each a like cover, which is 

 withdrawn, disclosing triangular lips, which are pressed against 

 the glass, when attachment is desired. 



All the Blatta do not have these organs equally developed. 

 For this female is the only one I have caught in the act of walk- 

 ing head downward. While of a dozen I had in a bottle only 

 two succeeded in climbing to its mouth, and resting on its 

 mosquito-net covering. 



THE HEAD OF SALAMANDRA MACULOSA. 



BY LUDWIG RIEDERER. 



{Read June 3d, 1887.) 



The consecutive sections of the Head of Salamandra macu- 

 losa, larva, were received so favorably at our last meeting that 

 I was desired to exhibit them at another time, and to give a 

 more explicit description. For this purpose I have prepared 

 these enlarged diagrams. 



The amphibia show under the microscope, more advanta- 

 geously and more distinctly than any other class of animals, the 

 final constituents of the tissues, such as cells, their nuclei, and 

 the fibres and fibrils of the muscles and nerves. While in the 

 process of development the exhibition of these tissues is more 

 instructive than in the condition of their maturity. 



To give first a general survey of the diagram, we see the skin 

 enclosing the whole, the skull, with the brain central in the 

 upper part, the eyes on both sides of the skull, the cavity of the 

 mouth, the tongue, and the conduits leading to the openings of 

 the gills. 



