428 ■ SYSTEMATIC PALEONTOLOGY 



known, and as we have no reliable figures with which to compare onr 

 species we cannot now say how close the relationship between them may 

 be. Of other species, Hinck's variety foUacea of P. sJcenei (Ellis and 

 Solander) agrees rather closely in its zoarial characters with P. convo- 

 luta, but there are good specific diiferences in their respective zooecia. 



Occurrence. — Calvert Formation. Heed's. 



Collection. — Maryland Geological Survey. 



Palmicellaria punctata n. sp. 

 Plate CXYI, Fig. 1. 



Description. — Of this species we have seen only the fragment of a 

 bifoliate zoarium here figured. It has punctate zooecia, with a subcir- 

 cular orifice and a mucro like the preceding, but its zorecia are much 

 smaller and the mucro less prominent. The ovicells, on the other hand, 

 are relatively larger and longer. 



Occurrence. — Calvert Formation. Eeed's. 



Collection. — Maryland Geological Survey. < 



Family CELLEPORID/E. 



Genus CELLEPORA (Fabricius) Hincks. 



Cellepora massalis n. sp. 

 Plate CXVII, Figs. 3, 4. 



Description. — Zoarium massive, composed of many layers, often 

 nodose, always rough. Zooecia erect, very irregularly arranged, four or 

 five in 2.0 mm. ; orifice circular, with a thin raised peristome. Gener- 

 ally the peristome of each zooecium bears upon its inferior side a promi- 

 nent rostrum containing a large avicularium pointing obliquely upward 

 and outward. Surface of zooecia, excepting the peristome, coarsely 

 punctate. Ovicells not observed. 



Though a common fossil, well-preserved specimens are rather rare. 

 As a rule the surface of the masses appears merely cellulose or spongy 

 and the zooecia quite characterless. Several excellent examples, however, 

 show that the species is closely related to C. pumicosa Linnseus, the 



