SPECHTS FERRY BRYOZOAN FAUNA 



0.03 to 0.06 mm in thickness but locally as much as 0.10 mm thick; walls some- 

 what more commonly amalgamate but may be integrate, particularly in local areas; 

 cingulum commonly developed and composed of laminae concentrically disposed 

 about zooecial aperture. Mesopores rare to uncommon, generally somewhat more 

 numerous where zooecia have well developed cingula. Maculae commonly observed 

 and represented by clusters of four to seven zooecia above average in size and 

 intercalated mesopores. Acanthopores not definitely recognized. 



Longitudinal section. — Zooecia straight and erect in axis, bending gradu- 

 ally to zoarial surface in submature zone and curving somewhat more abruptly near 

 base of mature region. Zooecial walls thin in axis, commonly flexuous or rarely 

 and locally crenulated, and thickening conspicuously and generally abruptly at 

 base of mature zone; under high magnification (X210) wall vaguely and finely granu- 

 lar in axis but composed of laminae moderately to broadly convex outward in mature 

 region; dark line or band, centrally located in zooecial wall, commonly developed. 

 Cingulum of fine laminae nearly parallel to length of zooecium commonly forms outer 

 part of zooecial wall; cingulum usually separated from primary wall material by 

 thin, well developed black line. Where cingulum absent, wall laminae continuous 

 into cystiphragms and diaphragms; where present, material of cingulum apparently 

 continuous into these structures. Diaphragms lacking in axis, either lacking or 

 widely spaced (usually lj to five zooecial diameters apart) in poorly defined sub- 

 mature zone, and closely spaced, generally one-half zooecial diameter apart or 

 less, in mature zone where they range from about five to approximately 22 per 



EXPLANATION OF PLATE 2 



Figures 2, 3, and 5 are X60; all others are X20. 



Specimen number and collecting locality are shown in parentheses follow- 

 ing explanation of figure; for example, (12P129, 2) refers to specimen 12P129 ob- 

 tained from collecting locality 2. Structures in photographs are not retouched. 



Figure 



1-4 Homotrypa pauperata Perry , n. sp. 1. Tangential section of holotype 



showing well developed macula (12P129, 2). 2. Small part of 

 longitudinal section showing characteristic zooecial wall structure 

 in mature zone (12P129, 2). 3. Small portion of tangential section 

 showing nature of zooecial wall (12P129, 2). 4. Longitudinal sec- 

 tion displaying local development of flexuous zooecial walls, sparse 

 occurrence of imperfectly formed cystiphragms, and lack of diaphragms 

 in axis (12P129, 2). 



5-9 Homotrypa dickeyvillensis Perry, n. sp. 5. Tangential section of 



holotype showing typical appearance of cystiphragms and a single 

 acanthopore (12P88, 5). 6. Longitudinal section showing concen- 

 tration of diaphragms at nearly the same level in the axial region 

 (12P88, 5). 7. Tangential section of holotype showing probable 

 monticule in upper left quadrant (12P88, 5). 8. Longitudinal sec- 

 tion (12P88, 5). 9. Tangential section displaying prominent cysti- 

 phragms; in upper right, section descends to near base of mature 

 zone so zooecial walls are conspicuously thinner than elsewhere 

 (12P88, 5). 



