No.144'2. JAMES TYPES OF BRYOZOA—BASSLER. 47 



James gave a good definition of his specie^ with the exception that 

 he omitted stating the generic character —the presence of the two 

 mesopores between the ends of the zocjecia. 



IVi^nopora expanm is distinguished from associated bryozoa by its 

 broad bifoliate fronds springing from a pointed base, with oval zooecia 

 arranged in parallel rows and with the ends of the zocecial apei'tures 

 separated by two mesopores. The species is distinguished from other 

 species of Phivnopora by the broad, unbranched monticulated zoarium, 

 and b}^ the size of the zo(Bcia (6.5 in 2 nnn. measuring lengthwise, 

 and 8.5 in the same space transversely). 



Occurrence. — James's types were found in the Clinton of Clinton 

 Count}', Ohio, while those of Hall and Whitfield came from the corre- 

 sponding strata at Dayton, Ohio. 



PHiENOPORA FIMBRIATA (James). 



Plate VII, tigf^. 11, 12. 



Pfilodirti/ajiiiibnata ,1 AMES, Paleontologist, No. 1, 1878, p. 8. 



Plisenopora fimhrtata Foerste, Bull. Sci. Lai). Denisoii Univ., II, 1887, j). Ifil; 



III, 1888, pi. XV, fig. 7. 

 Phivnopora fimhriata Foerste, Geol. Surv. Ohio, VII, 1895, p. 599, pi. xxviii, 



fig. 7. 

 StiHopora vauderU Hai.l, Twelfth Ann. Kept. Indiana (xeol. Nat. Hist., 1883, 



p. 268, pi. xiu, figs. 1, 2. 



Zoarium of narrow, parallel margined, smooth, compressed, l)ifoli- 

 ate branches averaging 3.5 mm. in width, and forming b}' frequent 

 bifurcation a flexuous frond, which in the type specimen is about 50 

 mm. in height and (lO mm. wide. Margins of branches rather wide 

 and occupied by several rows of pores similar to the mesopores placed 

 between the ends of the zooecial apertures. These marginal pores give 

 to the edges of the branches the very finely striated appearance men- 

 tioned by James as the marked feature of the species. However, the 

 number of pores along the margin can not be considered a good spe- 

 cific character, as it depends upon the age of the zoarium, 3'oung exam- 

 ples exhibiting few, and the oldest specimens the maximum number. 

 The zocecial apertures are elliptical and arranged in longitudinal rows; 

 5 zooecia in 2 mm. measuring lengthwise, and nine rows in the same 

 space transversely. Two pits or mesopores usually separate the ends 

 of the zooecia, but occasional!}' three may be detected. 



This fine, characteristic Clinton species is distinguished from the 

 other branching forms of Phmnojyora by its narrow, liexous, dicho- 

 tomously dividing branches and the general aspect of the resulting 

 zoarium. 



Occurrence. — The type Is from the Clinton formation in Clinton 

 County, Ohio. Other localities are Dayton and Belfast, Ohio. 



