118 



URNATELLA GRACILIS. 



the diameter equal to the lengtli of the body, surrounded by fourteen cylindrical, ciliated, 

 retractile arms. Stems up to 4 mm. in length.'' Leah/. 



Fig. 17.* 



Urnatella gracilis. 

 a. Oral orifice, b. Anal orifice, c. Storaacli. d d d. Gemmae. 



Synonyms. — 1854. Urnatella gracilis. Leidy, Proceedings Acad. Nat. Sci. of Philadelphia, 



vol. V, p. 321. (Original figure of the cosnceciura.) 



1854'. Urnatella gracilis. Leidy, Proceedings Acad. Nat. Sci. of Philadelphia, 

 vol. vii, p. 191. 



Iconography. — Original figures of the coencecium by Leidy. 

 Habitat. — On the under side of stones in running water. 

 Locality. — River Schuylkill, in the city of Philadelphia, United States. Br. Lcidi/. 



Besides the two short notices contained in the references given above, there is no other 

 published account of this remarkable genus, and zoologists cannot but look forward with 

 impatience to the fuller description promised by its discoverer. 



While the present sheets were passing through the press, I received a note from Pro- 

 fessor Leidy, along with a pencil sketch of the expanded polypide, from which I have given 

 the accompanying woodcut. "The anatomy of the animal," writes Dr. Leidy, " is easily ex- 



* From a pencil sketch furnished by Dr. Leidy, 



