

DESCRIPTION OF SPECIES BLASTOIDEA 289 



and by less strongly developed longitudinal lines, the longitudinal lines 

 being strongest toward the base. The characters of the spiracles and the 

 summit are unknown. 



The dimensions of a nearly complete but badly crushed example are : 

 Height, 20 millimeters; greatest width approximately, 15 millimeters. 



Remarks. — This species was first described from detached radial plates 

 found at "Button Mould Knob," south of Louisville, Kentucky. The 

 Fern Glen examples agree exactly with the Kentucky specimens as they 

 have been described and illustrated, the essential feature of the species, 

 aside from its general form and proportions, being the peculiar orna- 

 mentation of the plates and the form of the side plates of the ambulacra, 

 with their finely crenulated inner extremities. The Fern Glen specimens 

 are all more or less fragmentary, the best example seen being one col- 

 lected by Mr Sampson. This specimen is nearly complete, but is so 

 crushed laterally as to destroy the characters of the base and the summit. 



MOLLUSCOIDEA 

 BBYOZOA 



In addition to the species here noted, the Fern Glen fauna contains 

 several other forms of Bryozoa which are represented by material which 

 is too imperfectly preserved for certain identification or for description. 

 Several of them, however, are probably undescribed species. 



FISTULIPORA FERNGLENENSIS n. sp. 



Plate 15, figures 1-2 



Description. — Zoarium consisting of more or less subcircular or ellip- 

 tical disk-like bodies, or of irregular expansions, apparently free or 

 attached only by the center of the disk, the under surface usually concave 

 and covered by a wrinkled epitheca. Celluliferous surface convex in the 

 subcircular examples, with a more or less irregular contour; monticules 

 and maculae ill defined or obsolete. Zooecial apertures with a more or less 

 regular quincunxial arrangement, more or less oblique, subelliptical in 

 outline, with a broad and shallow but distinct lunarium on one of the 

 longer sides of the ellipse ; their longer diameter is .4 millimeter to .5 

 millimeter, the shorter being about three-fourths of the longer; the dis- 

 tances between the apertures is about one and one-half times the width 

 of the apertures themselves. In tangential section the interzocecial 

 vesicles are seen to be polygonal in form and are usually two in number 

 between adjacent zocecia. In longitudinal section the zocecia seem to 

 lack diaphragms altogether, although they may rarely be present. 



