294 



MOLLUSCOIDA. 



[RAC. BOT. 



FIG. 456. Atacto- 

 porella new- 

 portensis. 



newportensis, Ulrich, 1883, Jour. Cin. 

 Soc. Nat. Hist., vol. 6, p. 250, Utica 



Slate. 



ortoni, Nicholson, 1874, 

 (Chetetes ortoni,) Quar. 

 Jour. Geo. Soc., vol. 30, 

 p. 513, and Ohio Pal., 

 vol. 2, p. 211, Hud. Riv. 

 Gr. 



schucherti, Ulrich, 1883, 

 Jour. Cin. Soc. Nat. 

 Hist., vol. 6, p. 251, Hud. 

 Riv. Gr. 



tenella, Ulrich, 1879, (Atactopora tenella,) 

 Jour. Cin. Soc. Nat. Hist., vol. 2, p. 123, 

 Hud. Riv. Gr. 

 typicalis, Ulrich, 1883, Jour. Cin. Soc. 



Nat. Hist. vol. 6, p. 248, Utica Slate. 

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



193. [Ety. baktron, staff; poros, pore.] 

 Ramose, solid ; base tapering, striated ; 

 cells tubular, curved oblique from the 

 center; septa thin, apertures oval, dis- 

 tant near the base, closer above ; inter- 

 spaces granulose. Type B. granistriata. 



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



194, Ham. Gr. 



granistriata, Hall, 1881, (Trematopora 

 granistriata,) Trans. Alb. Inst., vol. 10, 

 p. 182, and Pal. N. Y., vol. 6, p. 193, 

 Ham. Gr. 



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



vol. 8, pi. 70, Keokuk Gr. 

 BATOSTOMA, Ulrich, 1882, Jour. Cin. Soc. Nat. 

 Hist., vol. 5, p. 154. [Ety. batos, prickly 

 bush ; stoma, mouth.] Ramose, base ex- 

 panded ; cell apertures ovate or circu- 

 lar, surrounded by a ring-wall ; inter- 

 stitial tubes numerous ; spiniform tubuli 

 abundant. Type B. implicatum. 



fertile, Ulrich, 14th Rep. Geo. Sur. Minn., 

 p. 92 Trenton Gr. 



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

 111., vol. 8, pi. 35, Hud. Riv. Gr. 



implicatum, Nicholson, 1881, (Monticuli- 

 pora implicata,) Struct, and Affin. of 

 Montic., p. 147, Hud. Riv. Gr. 



irrasum, Ulrich, 1886, 14th Rep. Geo. Sur. 

 Minn., p. 94, Trenton Gr. 



FIG. 457. Batostoma jamesi. Natural size and 

 magnified. 



jamesi, Nicholson, 1874, (Chetetes jamesi,) 

 Quar. Jour. Geo. Soc., vol. 30, p. 506, 

 and Ohio Pal., vol. 2, p. 200 Hud. 

 Riv. Gr. 



manitobense, Ulrich, (in press,) Micropa- 

 Ifeontology, p. 7, Hud. Riv. Gr. (?) 



ottawense, Foord, 1883, Cont. to Micropa- 

 laeontology, p. 18, Trenton Gr. ^ 



rugosum, Whitfield, 1882, (Fistulipora ru- 

 gosa,) Geo. Wis., vol. 4, p. 255, Hud. 

 Riv. Gr. 



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



vol. 8, pi. 35, Hud. Riv. Gr. 

 BATOSTOMELLA, Ulrich, 1882, Jour. Cin. Soc. 

 Nat. Hist., vol. 5, p. 154. [Ety. dimin- 

 utive of Batostoma.] Ramose, smooth, 

 cell apertures small; interstitial cells 

 and spiniform tubuli ; walls of tubes 

 in the peripheral region thick. Type 

 B. gracilis. 



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

 vol. 8, pi. 75, Kaskaskia Gr. 



FIG. 458. Batostomella gracilis. Natural size 

 and enlarged. 



gracilis, Nicholson, 1874, (Chetetes gra- 

 cilis,) Quar. Jour. Geo. Soc., vol. 30, p. 

 504, and Ohio Pal., vol. 2, p. 198, Hud. 

 Riv. Gr. 



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

 111., vol. 8, pi. 75, St. Louis Gr. 



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

 vol. 8, pi. 75, Kaskaskia Gr. 



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

 vol. 8, pi. 46, Ham. Gr. 



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

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



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



111., vol. 8, pi. 35, Hud. Riv. Gr. 

 BERENICEA, Lamoureux, 1821, Exp. Meth. 

 des, genres, d. pol., 80. [Ety. mytho- 

 logical name.] Incrusting, composed 

 of a very thin, calcareous, foliaceous 

 base, bearing numerous ovate, distinctly 

 separated cells, not piled; aperture 

 round near the broad anterior end; 

 cells disposed in an obscurely radiated 

 arrangement. Type B. diluviana. 



insueta, Dawson, 1883, Rep. on Redpath, 

 Mus. No. 2, p. 12, Subcarboniferous. 



minnesotensis, Ulrich, 1886, 14th Rep. 

 Geo. Sur. of Minn., p. 58, Trenton <!r. 



primitiva, Ulrich, 1882, Jour. Cin. Soc. 

 Nat. Hist., vol. 5, p. 157, Hud. Riv. Gr. 



vesiculosa, Ulrich, 1882, Jour. Cin. Soc. 

 Nat. Hist., vol. 5, p. 158, Utica Slate or 

 lower part Hud. Riv. Gr. 

 BOTRYLLOPORA, Nicholson, 1874, Geo. Mag. 

 Lond. n. s., vol. 1, p. 160. [Ety. botryl- 

 los, cluster ; poros, pore.] Incrusting, 

 forming systems of small circular disks, 

 the upper surfaces of which are marked 

 with radiating, cell-bearing ridges ; non- 



