THE HEDERELLOIDEA — BASSLER 53 



emerging from one side, quite swollen at the base, and with romid, 

 erect apertures. The branches are 1.2 mm. in diameter, the zooecial 

 tubes are 2 mm. or less in length, the aperture averages 0.75 mm. in 

 width, and 2}^ to 3 zooecia occur in 5 mm. Surface very minutely 

 porous and with annulations so faintly indicated that it is almost 

 smooth. 



Occurrence. — Middle Devonian (Traverse): Petoskey Cement Co., 

 Petoskey (holotype) (Lower Gravel Point Umestone), Thunder Bay 

 River (Norway Point formation), Alpena and Thunder Bay quarry 

 (Alpena limestone. Dock Street clay), all in Michigan, 



Holotype.— \J.^.1^M. Nos. 54110, 87940, 87942-87945. 



HEDERELLA OBESA. new species 



Plate 10, Figure 4 



Although evidently related to H. magniventra, this species may be 

 recognized by its more regular zoarium branching at an angle of 45° 

 or less and at intervals of 10 to 12 mm., by its short, swollen zooecial 

 tubes arranged alternately on both sides of the central axis instead 

 of one, and by the larger dimensions of the zooecia, their length 

 averaging 2.7 mm., their width 1 mm., and 2 to 2.5 occurring in 

 5 mm. on the same side of a branch. The type specimen is a colony 

 covering about 35 sq. cm. of a flat frond of Fistulijjora. 



H. major has a similar method of growth but has tubes half again 

 as long, which expand gradually in diameter instead of immediately 

 becoming ventricose. 



Occurrence. — Hamilton (Ludlowville-Tichenor limestone): 18-Mile 

 Creek, N. Y. 



Holotype.— \J. S.N. M. No. 87935. 



HEDERELLA MAJOR, new species 



Plate 8, Figure 4 



The type specimen incrusting a lamellate Fistulipora represents a 

 new species in which the tubes are unusually large and in close con- 

 tact for the greater part of their length, arising alternately from the 

 side of the preceding one and forming branches 4 mm. wide, arising 

 at an angle of 45°. The zooecial tubes average 4 mm. in length and 

 1.5 mm. in width, with 2 in 5 mm. 



The imusual size of the zooecial tubes and branches of this species 

 makes its recognition easy. The surface ornamentation is as in 

 other members of the family, and the method of budding is exactly 

 the same as in Hederella, so that it does not seem possible that it could 

 belong to the Auloporidae, where it might be referred. 



Occurrence. — Hamilton (Widder shale): Thedford, Ontario. 



Holotype.— V.S.N. M. No. 26576. 



