Maryland Geological Survey 265 



about the middle of the lunarium. Interzocecial spaces finely spinulose or 

 appearing cellulose, usually flat, occasionally a little convex, the average 

 width less than the diameter of the zooecial apertures ; 6 to 7 of the latter 

 in 2 mm. Peristome very thin; lunarium but slightly thicker and more 

 elevated, though never very prominent, and carrying three tooth-like 

 projections that are clearly distinguishable at the surface only when the 

 specimen is exceptionally well preserved. 



The most striking peculiarity brought out by tangential sections is the 

 three denticles on the lunarium, which, with the usually free ends of the 

 lunarium, project into the zooecial cavity, giving the posterior side of its 

 circumference the quinque-dentate character that has suggested the name. 

 In other respects, the internal characters are as usual in species of 

 Fistuliporella. Unless these three extra denticles are comparable with the 

 lunarial pores of Anolotichia they are to be considered as a unique feature 

 among Paleozoic bryozoa. 



Among stratigraphically associated bryozoa, Lioclema pulcliellum pre- 

 sents considerable zoarial resemblance, but its internal, as well as finer 

 superficial characters, are so different that it is not likely to be confused 

 with this Fistuliporella. 



Occurrence. — Heldeubekg Formation, Keyser Member. Iveyser, 

 West "Virginia. 



Collection. — U. S. National Museum. 



Fistuliporella minima n. sp. 

 Plate XLIII, Figs. 13-16 



Description. — Zoarium, in the only specimen seen, a depressed globular 

 mass about 20 mm. in diameter, composed of numerous thin, closely super- 

 posed layers, 1 to 3 mm. thick, of which the first probably grew upon some 

 foreign body. Surface, where well preserved, showing small, subsolid 

 maeulfB raised into low monticles, a trifle less than 2 mm. apart, measur- 

 ing from center to center. Zooecia very small, their apertures rounded 

 or somewhat obscurely trilobate and sunk in depressions so that the 

 lunarium is scarcely discernible at the surface, 11 to 12 in 2 mm. Inter- 

 apertural spaces a little narrower than the zooecial tubes, ridge-like, and, 

 in common with the maculae, minutely granulose. 



