The Ohio ^JSCaturali 



PUBLISHED BY 



The Biological Club of the Ohio State University, 

 Volume V. APRIL, 1905. No. 6. 



TABLE OF CONTENTS 



Williamson— Oilonata, Astacidae and Unionidae Colleet^^d Along the Rockeastk' River 



at Livingston, Iveiitiicky 309 



Claassen— Key to the Liverworts Recognized in tlie Sixtli Edition of Gray's Manual 



of Botany 312 



Smith— Key to the Ohio Elms in the Winter Condition 315 



Gleason— Notes from the Ohio State Herbarium. Ill 316 



Riddle— Development of the Embryo Sac and Emliryo of Stapliylea trifoliata 320 



YoKK— A New Aspidiotus from Aesculus glaijra 325 



Landacre — The Rate of Growth in Epistylis flavicans 327 



Surface— Meeting of the Biological Clul) 329 



ODONATA, ASTACIDAE AND UNIONIDAE COLLECTED 



ALONG THE ROCKCASTLE RIVER AT 



LIVINGSTON, KENTUCKY. 



E. B. Williamson. 



The few following records of two days collecting in Rock- 

 castle County, Kentucky, near the headwaters of the Cumberland 

 River on June 23 and 24, 1904, may be of interest. Since col- 

 lecting along the Cumberland at Nashville, Tennessee, I have 

 been desirous of following the same river among the hills of 

 eastern Kentucky where I expected to find the Rockcastle a 

 rapid mountain stream with waterfalls, deep pools and long, 

 swift rapids. Such is far from its nature. Its bed in the soft 

 rocks is nearly made and, resting from former labors, the stream 

 flows so slowdy under the overhanging branches of birch trees 

 that its motion is almost imperceptible. Shaded bv trees and 

 hills, steep-banked, cold and motionless, it offers few of those 

 attractions to dragonflies which I had hoped ot find. There are 

 no gorges and only an occasional low, short ripple (locally shoal) 

 relieves the monotony of long stretches of canal like tranquilitv. 

 The perfume of flowering laurels on the verdure-clothed banks 

 saturate an atmosphere in which sound and motion would be as 

 sacrilegious as in the chamber of death. Doubtless at seasons 

 there is greater activity. On the dates above mentioned (June 

 23 and 24) only nine species of dragonflies were taken. I believe 

 collecting three weeks earlier would have revealed a greater 

 number of species and individuals, and possibly a great many 

 Gomphines might have been found at the ripples at this time. 



