44 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxm. 



in his species, which is conspicuously not the case in the one under 

 consideration. 



Locality and horizon. — Pennsylvanian (Wu-shan limestone); near 

 Ta-ning-hien, East Ssi-ch'uan (Station 4). 



FISTULIPORA WAAGENIANA," new species. 



Description. — Of this species our collection contains liut one speci- 

 men, which displays the following characters: The form is that of a 

 hollow c}' Under, the diameter of which is 25 nmi., the length of the 

 fragment being 45 mm. The thickness of the zoarium varies some- 

 what, but has an average of about 5 mm. It can not be determined 

 whether the original shape was incrusting, hollow cylindrical, or solid 

 cjdindrical. So far as can be observed, there is no epitheca upon the 

 inner surface, nor is there any flexing of the cells toward a point of 

 origin. From this circumstance it can perhaps be inferred that the 

 original form was a solid cj'^linder, of which the axial portion, includ- 

 ing the immature region of the cells, has by some means been destroyed. 



In thin sections the ztecial tubes are seen to occur about four in the 

 space of 2 mm. Their distril)ution, however, is quite irregular. They 

 have ver}^ thick walls, which in some cases are almost in contact and 

 in others are* separated by distances equal to about the inner diameter 

 of the tubes. In the region of macule their distance is sometimes two 

 or three times the diameter. The cells are of course nearly circular, 

 and as a rule separated by rather large mesopores in single rows. 

 Near the surface the spongy tissue of the mesopores gives place to 

 solid investment, in which, though the inner portion of the tulles has 

 still a circular section, the outer boundary, more or less clearly shown, 

 is sharply polygonal. A lunarium is as a rule entirely absent, but in 

 rare cases indistinct but cei'tain traces of the structure can be observed. 

 It is also more or less regularly developed in young stages. Tabulse 

 are rather few and distant, and they are developed at ver}^ irregular 

 intervals. The vesicles observed in longitudinal sections vary greatly 

 in size. As a rule thej^ are but gently convex, the upper and lower 

 surfaces often being nearly iiat and parallel. 



This species is clearly distinct from American forms of similar geo- 

 logic age, and also from J^. paralitica., the only species described by 

 Waagen and Wentzel from the Salt Range. It is also ver}^ distinct 

 from F. tuherosa., a member of the Lo Ping fauna descril)ed ))v Kayser. 



Locality and horizon. — Pennsylvanian (Wu-shan limestone); near 

 Ta-ning-hien, East Ssi-ch'uan (Station 2). 



"This species is named for Mr. William Waagen. 



