NEW FORMS OF CALAMITES 1 47 



resembling the swathing band, and is doubtless spun from the small 

 spinning tubes. 



The silk of this spider, as also the structure of its web, can be 

 studied conveniently by taking a large pane of glass and passing 

 it behind the web. By moving the glass forward and snipping off 

 the threads with scissors, the web is transferred to the glass. This 

 makes a suitable mount for the naked eye and microscopic study. 



A word should be said about the venom of spiders. All spiders 

 secrete poison, but only very few spiders are dangerous. I have 

 collected hundreds of specimens of spiders, but have never been 

 bitten. In fact, no spider even attempted to inject its venom. 

 It is the opinion of such authorities as Comstock that in the North 

 there is no spider to be feared while in the South there is a single 

 easily recognized species "that is believed by some people to be 

 dangerous." Certainly no one can justify his antipathy to the study 

 of araneology on the ground that spiders are venomous and 

 dangerous. 



Department of Zoology, 

 University of Notre Dame. 



NEW FORMS OF CALAMITES 



BY N. M. GRIER 



The specimens upon which this work is based were collected 

 by Mr. Caspar Reel and myself at Reel's Stone Quarry, East 

 Bellevue, Pa., from the sandstone above the Elk Lick Coal. They 

 were exhibited and discussed before the Academy of Science of 

 St. Louis, Jan. n, 1915, and are deposited in the collection of the 

 Academy. 



EUCALAMITES. 



Group of Catamites cruciatus Sternb. 



Calamites cruciatus harrisoni, n. sp. 



PI. I., figs. 1. 2. 



Internodes 23-28 mm. in length, broader than long. Articulations 



well marked by nodal swellings. Ribs well defined, 2-3 to 3-4 mm. in 



breadth, equal, half round, not alternating and generally somewhat 



inflated at the articulations. Furrows generally 1-3 the width oj the 



ribs. Branch scars at least 7 to the node, 8-9 mm. in diameter, showing 



