578 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



HOMOTRYPA GRANDIS, new species. 



Plate XX, figs. 7-10. 



Zoarium large, 10 em. or more in height, subcylindrical or com- 

 pressed, })r!UK-hing rather frequently, an average example l^eing 2 cm. 

 in width and half as much in thickness. Surface generally smooth, 

 but sometimes exhibiting low rounded monticules. Apertures polyg- 

 onal, direct, thick walled, nine in 2 mm. Mesopores restricted to the 

 macuhe. Acanthopores inconspicuous at the surface, but in thin sec- 

 tions they are seen to be small and very numerous, as luany as six- 

 teen sometimes surrounding a zo(x-cium. Intermural space finely 

 dotted, the dots often arranged in transverse rows. In tangential 

 sections the polygonal zooecia with their numerous, regularly arranged 

 acanthopores and intermural dots present a very pretty appearance. 

 In vertical sections the zo(£cial tubes show thin crinkled walls in the 

 axial region, and develop diaphragms only as the peripheral region is 

 approached. In the early part of the latter region, especially in the 

 bend from the axial to the peripheral, numerous cystiphragms and 

 diaphragms are developed, but in the remainder of the long mature 

 region only an occasional cystiphragm is seen, while diaphragms con- 

 tinue as numerous as before. 



In the mode of development of diaphragms and cystiphragms this 

 species resembles Ilomotri/j^eUa, but otherwise it has the characters of 

 IIomotrijjM. The large subcompressed branches, the numerous, small 

 acanthopores, the intermural structure, and the unusual disposition of 

 diaphragms and cystiphragms are characteristic of the species. 



Occurrence.— Khwwdiiiwi in the Platystrophia lynx horizon of the Lor- 

 raine formation exposed along Lumsleys Fork, 2 miles west of Good- 

 lettsville, Davidson County, Tennessee. 



Cat. No. 41764, U.S.N.M. 



HOMOTRYPA BASSLERI Nickles. 



Homotrypa bassleri Nickles, Jour. Cincinnati Soc. Nat. Hist., XX, 1902, no. 2, p. 

 103, figs. 1-5. 

 The small, cylindrical or slightly flattened tuberculated branches, 

 small zooecia (ten in 2 mm.), and internally the presence of cysti- 

 phragms unaccompanied by diaphragms characterize this species. 



Occurrence.— A rather common and characteristic fossil of the upper 

 part of the Warren beds, Lorraine formation, at Lebanon and Ore- 

 gonia, Ohio. 



Cat. No. 34330, U.S.N.M. 



HOMOTRYPA LIBANA, new species. 

 Plate XXII, figs. 1-3. 

 Zoarium, composed of small, thin, flat fronds, the most complete 

 example seen being 5 cm. high, 3 cm. at its greatest width, and less 



