96 
BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 
This species differs from Mastigopliora porosa Smitt, 1872, in its larger tremo- 
pores and in the smaller apertura. 
Occurrence.— Pleistocene: Mount Hope, Panama Canal Zone (rare). 
Cotypes. —Cat. No. 68535, U.S.N.M. 
SCHIZOPORELLA LATISINUATA Ulrich and Bassler, 1904. 
Plate 18, fig. 4. 
1904. Schizoporella latisinuata Ulrich and Bassler, Bryozoa: Maryland Geological Survey, 
Miocene, p. 421, pi. 119, fig. 2-4. 
Description. —Zoarium forming thin parasitic expansions over foreign bodies. 
Zooecia sharply distinguished from each other, rather irregularly arranged, often 
subrhomboidal, four or five in 2 mm.; surface coarsely punctate. Orifice terminal, 
directed somewhat obliquely forward, subcircular, broadly sinuate proximally, 
enclosed by a slightly elevated peristome. Avicularia rather small, prominent, one 
on either or both sides of the orifice, rarely wanting, situated close to the peristome; 
apparently not divided by a septum. Ovicells not observed. (Ulrich and Bassler.) 
Measurements.— Apertura- 
ha = 0.10 mm. 
Za = 0.10 mm. 
Short zooecia- 
[1/2 = 0.40-0.45 mm. 
[ 72 = 0.40 mm. 
Long zooecia 
Lz = 0.60 mm. 
Iz = 0.30 mm. 
Affinities. —The aperture is as high as wide and buried at the base of a small 
peristome. The avicularium is infraoral; its beak-is directed toward the median 
axis of the zooecia. The species has the exterior aspect of Stylopoma isahelleana 
Smitt, 1872, but differs in its larger avicularium and in the wider rimule of the 
aperture. We have not discovered the ovicell and are therefore not able to classify 
the species generically. 
Occurrence. —Miocene (Choptank formation): Jones Wharf, Maryland (rare). 
Holotype. —Cat. No. 68536, U.S.N.M. 
SCHIZOPORELLA CUMULATA Ulrich and Bassler, 1904. 
Plate 16, fig. 10. 
1904. Schizoporella cumulata Ulrich and Bassler, Maryland Geological Survey Miocene, p. 422, 
pi. 17, fig. 7. 
The original description is as follows: 
Zoarium probably massive, composed of layers of zooecia arranged very irregularly and piled upon 
each other much as in Cellepora. Zooecia of irregular shapes, often broad ovate, convex, large, 0.5 mm. 
or 0.6 mm. in length and nearly 0.5 mm. in width. Orifice rounded, slightly transverse, the proximal 
side broadly notched; peristome somewhat elevated, thick. Surface distinctly and abundantly punctate. 
Avicularia rather variable in size, situated on only one or on both sides of the orifice, the acuminate 
end of the aperture elevated and turned outwardly. Ovicells not observed. 
The general aspect of this bryozoan is decidedly like that of a Cellepora , and we can scarcely doubt 
that it is related to some of the species still referred to that genus. We have placed it under Schizoporella, 
not because we are satisfied that it really belongs there, but for the reason that its zooecial orifices and 
the avicularia are almost exactly as in other species (e. g., S. subquadrata and S. latisinuata) that we 
have referred to this genus. From these it is distinguished principally by the extremely irregular 
arrangement and piling up of the zooecia. 
