NATURAL SCIENCES OF PHILADELPHIA. 



127 



appendages, branching radically from common points in the vici- 

 nity of the contractile vesicle. 



Ouramozba vorax. Fig. A. Body active, usually ramifying 

 forward from a median stock extending from the posterior blunt 

 extremity. Posterior appendages numerous, ori- 

 ginating in several tufts up to five or six, from 

 one-third to nearly the length of the body, linear, 

 straight or curved, uniformly cylindrical, or here 

 and there contracted, commencing in a pointed 

 manner from a common root, and terminating 

 obtusely. Length of body, from I to ^ of a mm. ; 

 length of appendages from one-third to nearly 

 that of the body. 



The creature consumes multitudes of diatomes, 

 desmids, and filamentous alga?. Found in springs 

 and ponds, near Darby Creek, Delaware County, 

 Pennsylvania. 



Further observations have induced me to be- 

 lieve that the animal named 0. lapaa is the same 

 as the preceding. A variety has been observed 

 in several instances in which the animal had a 

 single pair of appendages springing from a com- 

 mon root. 



Ouramo3ba botulicauda. Fig. B. This species 

 is predicated on the form alluded to in my pre- 

 vious communication as having, - a single tuft of 

 three moniliform rays. I have seen it a number 

 of times since, and its characters appear to be 

 sufficiently constant to recognize it as a distinct 

 species. It is much smaller than the preceding. 

 The body measures about the T ^ of a millimetre. 

 The appendages are usually in a tuft of three; 

 each appendage consisting of from one to three sausage-like joints. 

 Found with the preceding. 



The Occurrence of Celestine in Blair County, Pennsylvania. 

 Mr. Chas. A. Young stated that Dana gives, as the original local- 

 ity of celestine, Frankstown, Huntington Co., Pa. The locality 

 is at Bells' Mills, Blair County. The mineral is found at the foot 

 of the western slope of Brush Mountain, on the west branch of 

 the Little Juniata, one mile south of railroad station. 



The celestine occurs in beds of irregular thickness, in a hard 

 gray limestone slate. The beds of the mineral are sometimes 

 almost an inch in thickness, thinning out in the space of a lew 

 feet to a thickness scarcely more than that of a piece of paper. 



The beds of the mineraf sometimes split, having for a parting 

 a soft brown shale, which material also directly underlies and 

 overlies the mineral to a depth of somewhat less than an inch. 



