. IvIC.j 



MOLLUSCOIDA. 



311 



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

 111., vol. 8, pi. 75, Keokuk Gr. 



minutissimum, Nicholson, 1875, (Callo- 

 pora minutissima,) Pal. Prov. of On- 

 tario, p. 77, Hamilton Gr. 



FIG. 491. Leioclema foliatum. a, Vertical section x28,showing entire thick- 



tural space smooth ; intercellular space 

 vesiculose. Type L. concentrica. 

 alternate, Hall, 1881, Bryozoans of the 

 Up. Held. Gr., p. 8, and Pal. N Y 

 .vol. 6, p. 80, Up. Held. Gr. 



alveata, see Odonto- 



trypa alveata. 

 bistriata, Hall, 1881, 

 Bryozoans of the 

 Up. Held. Gr. p 



8, and Pal. N. Y., 

 vol. 6, p. 79, Up. 

 Held. Gr. 



bullata, Hall, 1887, 

 Pal. N. Y., vol. 6, 

 p. 205, Ham. Gr. 



carinata, Hall, 1881, 

 Bryozoans of the 

 Up. Held. Gr., p. 



9, Up. Held. Gr. 

 circincta, see Sele- 



nopora circincta. 



acanthopores ; 6, tangential section x28, showing distribution of acantho- 

 pores, raesppores, and zooecia; o, small portion of wall x50; d.acantbopore 

 x 50, showing its structure. 



puuctatum, Hall, 1858, Callopora punc- 



tata, Geo. Sur. Iowa, p. 653, Keokuk 



and Warsaw Grs. 

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



111., vol. 8, pi. 75, Kinderhook Gr. 

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



111., vol. 8, pi. 75, Kinderhook Gr. 

 wilmingtonense, Ulrich, (in press,) 



Geo. Sur. 111., vol. 8, pi. 34, Hud. 



Riv. Gr. 

 LEPTOTRYPA, Ulrich, 1883, Jour. Cin. Soc. 



Nat. Hist., vol. 6, p. 158. [Ety. leptos, 



thin; trupa, perforation.] Thin, in- 

 crusting ; cells polygonal, thin-walled ; 



surface, with monticules ; spiniform tu- 



buli; no diaphragms or rudimentary. 



Type L. minima, 

 clavacoidea, James, 1875, (Chetetes clava- 



coidea,) Int. Catal. Cin. Foss., p. 2, and 



Nicholson on Struct, and Affin. Montic, 



p. 182, Hud. Riv. Gr. 

 clavis, Ulrich, 1883, Jour. Cin. Soc. Nat. 



Hist., vol. 6, p. 161, Utica Slate, 

 cortex, Ulrich, 1883, Jour. Cin. Soc. Nat. 



Hist., vol. 6, p. 162, Utica Slate, 

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



111., vol. 8, pi. 36, Trenton Gr. 

 minima, Ulrich, 1883, Jour. Cin. Soc. Nat. 



Hist., vol. 6, p. 159, Hud. Riv. Gr. 

 ornata, Ulrich, 1883, Jour. Cin. Soc. Nat. 



Hist., vol. 6, p. 160, Hud. Riv. Gr. 

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



111., vol. 8, pi. 36, Hud. Riv. Gr. 

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



111., vol. 8, pi. 36, Hud. Riv. Gr. 

 LICHENALIA, Hall, 1852, Pal. N. Y., vol. 2, 



6171. [Sig.from resemblance to a lichen.] 

 embranous expansions, growing in 

 circular or flabellate forms, cellnlifer- 

 ous on one side, the other covered with 

 an epitheca; cells septate, arising 

 from the epitheca ; apertures circular or 

 trilobate, often denticulate ; interaper- 



trypa cliyulata. 

 clypeiformis, Hall 

 1884, Rep. St. 

 Geol., p. 37, Ham. Gr. 

 colliculata, Hall, 1884, Rep. St. Geol D 



36, Ham. Gr. 



complexata, see Selenopora complexata. 

 concentrica, Hall, 1852, Pal. N. Y., vol. 2, 

 p. 171, Niagara Gr. 



FIG. 492. Lichenalia concentrica. Under sur- 

 face and upper surface magnified. 



concentrica var. maculata, Hall, 1879, 



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



117, Niagara Gr. 

 concentrica var. parvula, Hall, 1876, 28th 



Rep. N. Y. St. Mus. Nat. Hist., p. 117, 



Niagara Gr. 

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



204, Ham. Gr. 

 constricta, see Fistulipora constricta. 



conulata, Hall, 1881, Bryozoans of the Up. 



Held. Gr., p. 9, and Pal. N. Y., vol. 6, 



p. 81, Up. Held. Gr. 

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



203, Ham. Gr. 

 crassa, Hall, 1879, (Trematopora crassa,) 



32d Rep. N. Y. St. Mus. Nat. Hist., p. 



152, Low Held. Gr. 

 Crustacea, Hall, 1881, Bryozoans of the 



Up. Held. Gr., p. 8, Up. Held. Gr. 

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



Ham. Gr. 

 denticulata, see Pileotrypa denticulata. 



