BRYOZOA. 225 



Remarks — This species suggests some relationship to Moticulipora ( Heterotrypa) 

 barrandii Nicholson, of the Hamilton, but is characterized by thicker walls, more abund- 

 ant mesopores, and undulating zooecial walls. Also there is a greater variation in 

 the shape and size of the zooecia. 



Horizon — Lower beds. 



Holotype No. 27653 Walker Museum. 



. Suborder Integrata 

 Family Tematoporidae 

 Genus Monotrypa Nicholson 



Monotrypa cf. tabulata Hall 

 Plate 59, figures 1-3. 



1882. Chaetetes? tabulatus Hall, Rept. State. Geol. N. Y., pi. 9, figs. 12-15. 



1887. Chaetetes (Ptychonema) tabulatus Hall and Simpson, Pal. N. Y., vol. 6, p. 14, 



pi. 9, figs. 12-15. 

 1913. Monotrypa tabulata Ulrich and Bassler, Geol. Surv., Md. Low. Dev., p. 278, 

 pi. 50, figs. 1-4. 



Description — Zoarium apparently in subspherical masses, having a diameter of 

 from 40 to 45 mm. Zooecia closely crowded, irregularly polygonal in outline, sometimes 

 hexagonal, usually about 3 in the space of 1 mm. Walls thin, in longitudinal section 

 appearing extremely wavy, the undulations especially prominent in the mature region; 

 diaphragms sparsely present. Mesopores and acanthopores absent. 



Remarks — This is the most common bryozoa in the Little Saline limestone. The 

 specimens exhibit the characteristic polygonal zooecia, and the corrugated walls of 

 Monotrypa tabulata Hall, but differ in the presence of the diaphragms, and in having the 

 undulations of the walls less persistent. 



Horizon — Lower and upper beds. 



Figured specimens No. 27658 Walker Museum. 



Order Cryptostomata 



Family Fenestellidae 



Genus Unitrypa Hall 



Vnitrypa cf. lata Hall 

 Plate 59, figure 4 



1883. Fenestella (Hemitrypa) lata Hall, Trans. Albany Institute, vol. 10, (abstract 

 1881, p. 34). 



1885. Unitrypa spatiosa Hall (in error), Rept. of State Geol. N. Y. for 1884, pi. 2, 



fig. 12. 

 1887. Fenestella ( Unitrypa) lata Hall and Simpson, Nat. Hist. N. Y. Pal., p. 136, pi. 



52, figs. 1-10. 

 Description — Zoarium apparently infundibuliform, size unknown; branches of 

 medium strength, width above a bifurcation .31 mm., increasing to .51 mm. below a 

 bifurcation, straight, slightly rounded to flat on the reverse side, bifurcations infrequent. 

 Interstices and branches of about equal width. Dissepiments slender, from one-half to 

 the same width as the branches, more rounded, and frequently above the plane of the 

 latter. Fenestrules oval, length from .60 to .75 mm., width from .25 to .30 mm., 11 to 

 12 occupy the space of 1 cm. 



