THE HEDERELLOIDEA — BASSLER 49 



character is shown only in the younger branches. Older parts of the 

 zoarium, as shown on plate 5, figure 4, bud as in Hederella. The 

 zoarium forms small colonies upon brachiopods and cup corals, con- 

 sisting of a central, rather confused part in which, however, the shape 

 of the zooecia and radial arrangement of the branches around the 

 ancestrula are visible, the terminal portions of the branches presenting 

 the more regular budding and branching, the latter at an angle of 60°. 

 Here the zooecia arise alternately from about the middle of the pre- 

 ceding one, are about 2 mm. long and 0.55 mm. wide, with 3 in 5 mm. 

 measuring on the same side of the branch. In all parts of the colony 

 the zooecia are rather straight, short, and stout, budding at angles 

 of 25° and remaining free a considerable part of their length. 



Occurrence. — Devonian: Rockford and vicinity (Hackberry-Cerro 

 Gordo shale), Buffalo (Cedar Valley formation), Iowa; Milwaukee, 

 Wis. (Milwaukee limestone). 



Plesiotypes—lJ.S.l>iM. Nos. 54083, 66222, 94561. 



HEDERELLA PERSIMILIS. new species 



Plate 2, Figures 4, 5 



Associated with H. alpenensis at several Michigan localities is a 

 form closely allied but exhibiting tubes regularly twice as long and 

 considerably wider. This is here separated as a distinct species. 

 Zooecia 2 mm. in length and 0.5 mm. in width but sometimes as 

 much as 3 mm. long. As a rule 3 zooecia occur in 5 mm., but in some 

 parts of the zoarium 1)4 occupy the same space. Branching occurs at 

 6-mm. intervals with a tendency to form clumps of zooecia at the 

 bifurcation. 



Occurrence. — Middle Devonian: Bay View and Petoskey Cement 

 Works, Petoskey (cotypes), Charlevoix (Gravel Point Umestone), 

 Norway Point Dam (Norway Point formation). Partridge Point, 3 

 miles south of Alpena (Partridge Point formation), 1.6 miles north of 

 Norwood, Charlevoix County (Petoskey formation), all in the Trav- 

 erse group of Michigan; Athol Springs, N. Y. (Wanakah shale); 

 Thedford, Ontario (Widder shale). 



Cotypes.— U.S.'N.M. Nos. 87878-87880, 87974. 



HEDERELLA RUGOSA, new species 



Plate 2, Figure 7; Plate 3, Figures 7, 8 



Complete zoaria of this well-marked species have been found in- 

 crusting cup corals and other organisms. Starting with an ancestrula, 

 a small smooth bulb similar to that in typical Cyclostomata, it then 

 passes through a stage of frequently dividing, strongly rugose tubes, 

 which emerge from the main axis at a considerably high angle to the 



