266 Systematic Paleontology 



On account of the partial silicification of the specimen, the thin sections 

 prepared are not wholly satisfactory. They show sufficient of the struc- 

 ture,. however, to leave no doubt of the generic affinities. 



The extraordinarily small size of the zocecia is the character principally 

 relied upon in distinguishing this species, and it is so obvious when com- 

 pared with associated bryozoa that there is no reasonable chance of con- 

 fusing it with any other species known from these rocks. 



Occurrence. — Helderberg Formation, Keyser Member. Cash 

 Valley, Maryland ; Keyser, West Virginia. 



Collection. — U. S. National Museum. 



riSTULIPORELLA MARYLANDICA n. sp. 



Plate XLV, Figs. 8-11; Plate XLVIII, Fig. 4 



Description. — In the general stracture and size of the zooecia this 

 species resembles Fistuliporella cumulata but the difference in its method 

 of growth, number and arrangement of the granules, tabulation of the 

 zocecia and distribution of the vesicles are sufficient for its easy recogni- 

 tion. F. cii-mulata grows into rounded masses by the superposition of 

 successive zooecial layers, has very numerous and regularly arranged 

 granules, diaphragms in the zooecial tubes their own diameter apart and 

 crowded vesicules, while F. marylandica is ramose in growth with solid 

 branches, has few granules and these irregularly arranged, very few and 

 generally no tabukie developed in the zooecial tubes and less crowded 

 vesicles. Another internal characteristic of the present species is the 

 occurrence of six to eight granules in the lunarium. 



Occurrence. — Helderberg Formation, Keyser Member. Cash 

 Valley. 



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



Fistuliporella maynardi n. sp. 



Plate XLVI, Figs. 3-7 



Description. — Zoarium incrusting some foreign object, usually a coral, 



but forming a lamellate expansion by the superposition of several layers. 



Surface smooth, with well-marked solid macula? at intervals averaging 3 



