96 BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 



This species differs from Mastigophora porosa Smitt, 1872, in its larger tremo- 

 pores and in the smaller apertura. 



Occurrence. — Pleistocene: Mount Hope, Panama Canal Zone (rare). 

 Cotypes.— Cut. No. 68535, U.S.N.M. 



SCHIZOPORELLA LATISINUATA Ulrich and Bassler, 1904. 



Plate 18, fig. 4. 



1901. 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.) 



, . , fAa = 0.10mm. ^i, . • fi3 = 0.40-0.45 mm. 



Measurements. — Apertura, ___ bhort zooecia , _ .„ 



^ [to. = 0.10 mm. 1(2 = 0.40 mm. 



, . fZ2 = 0.60mm. 



Long zooecia , _ „. 



° [ fe = 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 isdbelleana 

 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 Wliarf , Maryland (rare) . 



Holotype.—Qai. 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. Zooeciaof 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. subguadrata 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. 



