NORTH AMERICAN LATER TERTIARY AND QUATERNARY BKYOZOA. 177 



HOLOPORELLA MASSALIS Ulrlch and Bassler, 1904. 



Plate 25, fig. 7. 



1904. Cellepora massalis TJlrich and Bassler, Maryland Geological Survey, Miocene, p. 428, pi. 

 117, fig. 3, 4. 



The original description by Ulrich and Bassler is as follows: 



Zoarlum massive, composed of many layers, often nodose, always rough. Zooecia erect, very irreg- 

 ularly arranged, four or five in 2.0 mm.; orifice circular with a thin raised peristome. Generally the peri- 

 stome of each zooecium bears upon its inferior side a prominent rostrum containing a large avicularium 

 pointing obliquely upward and outward. Surface of zooecia, excepting the peristome, coarsely punctate. 

 0-vicells not observed. 



,, , A . f/ia = 0. 13-0. 15 mm. 



Measurements. — Apertura , „ , „ 



'^ ^ I ta == 0. 1 / mm. 



We have little to add to the description of Ulrich and Bassler and are only 

 introducing a new photograph of the type specimen made on the same enlargement 

 as the other species of this volume so as to better allow comparison. In the 

 type we have observed a case of total regeneration which is very rare in the 

 Cellepore bryozoa. This species differs from Holoporella orhifera in the very con- 

 stant presence of a large frontal avicularium and in its smaller apertura. 



Occurrence. — Miocene (St. Mary's formation) : St. Mary's River, Maryland (rare). 

 Miocene (Choptank formation): Greensboro, Maryland (rare). Miocene (Calvert 

 formation) : Chesapeake Beach and Plum Point, Maryland (rare) . 



Holotype.—C&t. No. 68702, U.S.N.M. 



HOLOPORELLA ORBIFERA, new species. 



Plate 25, figs. 3-6. 



Description. — The zoarlum is free, large, very irregular; it forms most often 



lobate or branched masses 2 centimeters in length. The zooecia are large, little 



distinct, erect ; the frontal is smooth and siu'rounded by areolar pores. The apertiu-a 



is very large, orbicular, without cardelles, with a conCave proximal border. The 



oral avicularia are rare and inconstant. The interzooecial avicularia are large 



elliptical, with neither pivot nor denticles. 



,, J » X fAa = 0.20mm. 



Measurements. — Apertura, _ „. „„_ 



'■ |(a =0.20-0. 2o mm. 



Affinities. — This species is very easily recognized by its large oral dimensions. 

 It can be compared only with Holoporella magnifica Osbtirn, 1914, now living in 

 the water off Florida, from which it differs in the absence of the small interzooecial 

 avicularia. Osburn unfortunately has not indicated the enlargement of his figure. 



Occurrence. — Miocene (Duplin marl) : Wilmington, North Carolina (rare) and 

 Harvey's Mills, Leon County, Florida (rare) . Pliocene (Waccamaw marl) : Wacca- 

 maw River, Horry County, South Carolina (common) . 



Cotypes.—C&t. Nos. 68703, 68704, U.S.N.M. 



HOLOPORELLAC?) ECHINATA, new species. 



Plate 25, figs. 1, 2. 



Description. — The zoarium is a globuliform mass, more or less gibbose. The 

 zooecia are large, salient, convex, smooth. The apertura is subcircular, the prox- 



