322 [November, 



curving upwards, with the orifice expanded and horizontal or nearly so, amber 

 colored with darker piinct;i>. Interior axis white, opaque. 



Measurements. Length of a filannent of 9 articulations 1 line ; first articula- 

 tion l-14nth in. in breadth, last l-220th in. 



Habitation. Found growing on the under side of stones in the sanie situa- 

 tions as Plumatella and Paludicella, in the river Schuylkill below the dam, at 

 Philadelphia, below low water mark. 



Remarks, A very beautiful and graceful form, as before mentioned resembling 

 a minature Isis hippuris. 



The ccencecium is hard and resistant, and has no carbonate of lime entering 

 into its composition as might probably be suspected. When compressed, the 

 axis or interior central, white, opaque column is squeezed out of the ruptured 

 articulations in the form of transparent colorless oleoid granules, from the 

 1.32,000th to the l-4,000th of an inch in diameter. 



I have frequently found this enigmatic body, which I suspect to belong, as 

 previously stated, to a Polyzoon, but I have never been able to detect the polyp. 

 The filaments appear never to go beyond nine articulations, nor have I ever 

 found more than five filaments to a group. 



Reference to ike Figures. 



All the figures are much magnified. 



Fig- 1. Two articulations in outline of Paludicella elongata, with a terminal 

 young articulation. 



Fig. 2. One articulation of P. elongata; with a second terminal young one. 



Fig. 3. Urnatella gracilis, with three of the filaments cut off from the expand- 

 ed base. 



Fig. 4. A single articulation of U. gracilis with two tubes of exit. 



Fig. 5. A separated articulation of U. gracilis under compression, with the 

 escape of oleoid granules below from the central axis. 



The Corresponding Secretafy read a Report, embracing the last six 

 months, which was adopted. 



Dr. Fisher offered the following, which was adopted : 



Resolved, That a Committee of three members be appointed to inquire 

 into the expediency of enlarging the Hall of the Academy, so as to fur- 

 nish greater accommodation for the Museum and Library, and to report 

 a plan for the same, together with an estimate of the expense, and to re- 

 port at the annual meeting, December 30th, next. 



Dr. J. C. Fisher, William S. Vaux, and Dr. Bridges, were appointed 

 the Committee under this resolution. 



The following Resolution was also adopted : 



Resolved, That the privilege of endorsing tickets of admission to the 

 Museum on public days, be granted to Mrs. Emily Taylor, widow of 

 Richard C. Taylor, late a distinguished member of this Institution, and 

 that she be authorized and invited to visit at all times the Museum and 

 Library. 



