364 Systematic Paleontology 



sharply defined, subsolid, slightly depressed, grano-cellulose maculaj at 

 regular intervals of about 2 mm. measuring from center to center. 

 Zocecial apertures trilobate or subcircular, very slightly oblique, small, 8 to 



9 in 2 mm., those surrounding the maculse, little, if any, larger than the 

 others. Lunarium prominent, sharply elevated, forming about one-third 

 or a little less of the circumference of a zooecium. Interzooecial spaces flat 

 or gently convex and abundantly granulose. 



In sections the zocecia are seen to be circular in the less matured region 

 but strongly trilobate in the superficial region ; here also the lunaria are 

 well developed. In the maculae and interzooecial spaces the granulse are 

 arranged in rows corresponding with the outer walls of the vesicles. The 

 vesicles are small, usually in two rows between neighboring zocecia. At 

 the surface they are, as is usual in this genus, filled with a dense secondary- 

 deposit of tissue through which, however, the rods terminating in the 

 superficial granula;', penetrate. As may be seen also in vertical sections, 

 these rods are almost limited to the dense outer deposit. The zcecial tubes 

 have diaphragms distributed rather regularly at intervals about equalling 

 their own diameter. Vesicles rather regularly arranged, averaging 9 to 



10 in .5 mm. vertically. 



This form is closely allied to the Hamilton species F. cornuta (Hall 

 and Simpson), but is smaller in all its dimensions except the size of the 

 zoarium. In form and size of its zocecia, it agrees more closely with an 

 undescribed species occurring in the Waldron shale of Indiana. 



Occurrence. — Heldeebeeg Formation, Keyser Member. Cash 

 Valley, Pinto, Maryland ; Keyser, West Virginia. 



Collections. — Maryland Geological Survey, U. S. National Museum. 



Fistuliporella quinquedentata n. sp. 

 Plate XLI, Figs. 6-8 



Description. — Zoarium forming a thin crust on foreign bodies, usually 

 some cyathophylloid coral. Macul.ie distinct, substellate, on a plane with 

 the general surface, of moderate size, grano-cellulose. Zooscial apertures 

 somewhat transverse, the circumference usually appearing a little 

 straightened on the lunarial side, though in fact more sharply curved 



