312 



MOLLUSCOIDA. 



dissimilis, Hall, 1883, Rep. St. Geol., pi. 

 15, fig. 10-13, Low. Held. Gr. 



distans, Hall, 1883, Rep. St. Geol., pi. 15, 

 fig. 8-9, Low. Held. Gr. 



foliacea, Hall, 1884, Rep. St. Geol., p. 35, 

 Ham. Gr. 



geometrica, Hall, 1887, Pal. N. Y., vol. 6, 

 p. 79, Up. Held. Gr. 



granifera, see Pileotrypa granifera. 



imbricella, Hall, 1884, Rep. St. Geol., p. 

 35, Ham. Gr. 



longispina, see Lichenotrypa longispina. 



lunata, see Buscopora lunata. 



maculosa, Hall, 1884, (Trematopora mac- 

 ulosa,} 26th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 106, Low. Held. Gr. 



operculata, Hall, 1887, Pal. N. Y., vol. 6, 

 p. 205, Ham. Gr. 



ovata, Hall, 1887, Pal. N. Y., vol. 6, p. 80, 

 Up. Held. Gr. 



paliformis, see Gloesotrypa paliformis. 



permarginata, Hall, 1881, Bryozoans of 

 the Up. Held. Gr., p. 10, and Rep. St. 

 Geol., 1883, pi. 24, fig. 20, Up. Held. Gr. 



pustulosa, Hall, 1887, Pal. N. Y., vol. 6, p. 

 206, Ham. Gr. 



pyriformis, see Pileotrypa pyriformis. 



radiata, Hall, 1881, Bryozoans of the Up. 

 Held. Gr., p. 10, Up. Held. Gr. 



ramosa, Hall, 1887, Pal. N. Y., vol. 6, p. 

 199, Ham. Gr. 



serialis, Hall, 1887, Pal. N. Y., vol. 6, p. 

 32, Low. Held. Gr. 



stellata, Hall, 1884, Rep. St. Geol., p. 33, 

 Ham. Gr. 



subcava, Hall, 1881, Bryozoans of the Up. 

 Held. Gr., p. 8, and Rep. St. Geol., 1883, 

 pi. 24, fig. 23-25, Up. Held. Gr. 



substellata, Hall, 1881, Bryozoans of the 

 Up. Held. Gr., p. 7, and Rep. St. Geo., 

 1883, pi. 24, fig. 26, Up. Held. Gr. 



subtrigona, Hall, 1887, Pal. N. Y., vol. 6, 

 p. 196, Ham. Gr. 



tessellata, Hall, 1887, Pal. N. Y., vol. 6, 

 p. 207, Ham. Gr. 



torta, Hall, 1883, Rep. St. Geol., pi. 15, fig. 

 1-7, Low. Held. Gr. 



tortuosa, Hall, 1883, Rep. St. Geol., pi. 13, 

 fig. 17-18, Low. Held. Gr. 



vesiculata, Hall, 1887, Pal. N. Y., vol. 6. 



p. 197, Ham. Gr. 



LICHENOTRYPA, Ulrich, 1886, Cont. to Am. 

 Pal., p. 23. [Ety. lichen, a tree-moss; 

 trupa, perforation.] Zoarium thin, in- 

 crusting, in early growth like Fistuli- 

 pora, with short, tubular zooecia, wide, 

 concave interspaces, subcircular aper- 

 tures, posterior margin elevated; in 

 later growth peristomes of adjacent 

 cells unite by thin, irregular walls, 

 which traverse the interstitial spaces, 

 and form an irregular net-work, with 

 spine-like elevations ; interstitial cells 

 present. Type L. cavernosa. Syn. (?) 

 lor Lichenalia. 



cavernosa, Ulrich, 1886, Cont. to Am. Pal., 

 p. 24, Up. Held. Gr. 



longispina, Hall, 1881, (Lichenalia longi- 

 spina,) Trans. Alb. Inst., vol. 10, p. 11, 



and Pal. N. Y., vol. 6, p. 287, Up. 

 Held. Gr. 



LOCULIPORA, Hall, 1887, Pal. N. Y., vol. 6, 

 p. xxiii. [Ety. loculus, cell ; poros, 

 pore.] Fenestelloid ; branches con- 

 nected by dissepiments; cell apertures 

 in two ranges, surrounding the fenes- 

 trules; branches and dissepiments car- 

 inated ; carinse elevated and much 

 thickened above, having the appear- 

 ance of the branches and dissepiments 

 of the noncelluliferous face of the frond. 

 Type L. perforate. 



ambigua, Hall, 1876. (Fenestellaambigua,) 

 28th Rep. N. Y. St. Mus. Nat. Hist., p. 

 123, Niagara Gr. 



circumstata, Hall, 1887, Pal. N. Y., vol. 

 6, p. 144, Up. Held. Gr. 



perforata, Hall, 1884, (Fenestella perfo- 

 rata,) 36th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 65, Ham. Gr. 



LYROPORA, Hall, 1857, Proc. Am. Ass. Ad. 

 Sci., vol. 10, p. 179. [Ety. lyra, lute; 

 poros, pore.] Zoarium consisting of a 

 reticulated expansion, margined by two 

 strong diverging supports which curve 

 .outward and upward ; the rays of the 

 expansion carry from two to five rows 

 of cells ; but there are none in the dis- 

 sepiments; fenestrules small, ovate. 

 Type L. lyra. T. ' 



cinctura, Hall, 1885, \ 

 Rep. St. Geol., pi. \ 

 1, Ham. Gr. 



divergens, Ulrich, f ' 

 (in press,) Geo. f 

 Sur. 111. vol. 8, 

 pi. 58, Kaskaskia 



Kr.-a TToll 18^7 FIG. 493. Lyroporacinc- 

 lyra, Hall, 1857, tum rfoncellulifer- 



Proc. Am. Ass. ous side. 



Ad. Sci., vol. 10, 



p. 179, Kaskaskia Gr. 



ovalis, Ulrich, (in press,) Geo. Sur. 111., 

 vol. 8, pi. 58, Kaskaskia Gr. 



quincuncialis, Hall, 1857, Proc. Am. 

 Ass. Ad. Sci., vol. 10, p. 179, Kaskas- 

 kia Gr. 



ranosculum, Ulrich, (in press,) Geo. Sur. 

 111., vol. 8, pi. 58, Kaskaskia Gr. 



retrorsa, Meek & Worthen, 1868, Geo. 

 Sur. 111., vol. 3, p. 504, Burlington Gr. 



subquadrans, Hall, 1857, Proc. Am. Ass. 

 Ad. Sci., vol. 10, p. 179, Kaskaskia Gr. 

 MEEKOPORA, Ulrich, (in press,) Geo. Sur. 

 111., vol. 8, p. 383. [Ety. proper name.] 

 Bifoliate, sometimes branching; the 

 median laminae thin, flexuous; cells 

 arranged with their oblique apertures 

 directed toward the distal margin of 

 the expansion ; lunarium moderate or 

 obsolete ; zooecial tubes oblique, the an- 

 terior walls thinnest and flexuous ; dia- 

 phragms numerous, often recurved ; 

 ooecium a large oval cell, showing as a 

 convex space with a small apical perfo- 

 ration. Type M. eximia. 



(?) aperta, Ulrich, (in press,) Geo. Sur. 

 111., vol. 8, pi. 76, Keokuk Gr. 



