CRINOIDEA. 223 



ECHINODERMATA 



Class CRINOIDEA 

 Order Indeterminate 



Family Indeterminate 



Genus Edriocrinus Hall 



Edriocrinus cf. sacculus Hall 

 Plate 57, figure 11. 



1859. Edriocrinus sacculus Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 143, pi. 87, figs. 1-22, 



1861. 

 1913. Edriocrinus sacculus Ohern, Geol. Surv., Md. Low. Dev. p. 256, pi. 40, figs. 7-12. 



A single base of the Edriocrinus may be compared with this species. The concave 

 depressions on the upper margin into which the radial plates fit are not clearly defined. 



Horizon — Lower beds. 



Figured specimen No. 27559 Walker Museum. 



MULLUSCOIDEA 



Class BRYOZOA 



Order Cyclostomata 



Family Fistuliporidae 



Genus Fistulipora McCoy 



Fistulipora acutula sp. nov. 



Plate 58, figures 1, 2. 



Description — Zoarium massive, under surface with a wrinkled epitheca; cells tubular, 

 apertures somewhat irregular in outline, usually subcircular to oval ; lunarium only slight- 

 ly developed, and causing a slight angular protuberance of the peristome, the protuber- 

 ances having the same general direction. Apertures fairly regularly and closely dis- 

 posed, usually distant from one another from .25 to .75 mm. Cell walls thin. Vescicles 

 angular, generally smaller than the cell apertures. 



Cells tubular, cylindrical, characterized by numerous diaphragms which are oblique 

 to the walls and convex upwards. Interstitial tissue abundantly developed, composed of 

 vesicles irregularly disposed and not having the appearance of tubes divided by septa. 



Surface characters not observed. 



Remarks — This form may be distinguished from Fistulipora variolata by its less 

 massive appearance, by the slighter development of the lunaria, and by the presence 

 of diaphragms in the cell tubes. 



Horizon — Lower beds. 



Type specimen No. 27651 Walker Museum. 



Fistulipora variolata sp. nov. 

 Plate 58, figures 3, 4. 



Description— Zoarium massive, under surface with a concentrically wrinkled epi- 

 theca. Cells tubular, without diaphragms, apertures extremely irregular in outline, the 



