292 



MOLLUSCOIDA. 



[ani.-arc 



cingulata, Ulricli, 1882. Jour. Cin. Soc. 

 Nat. HiBt., vol. 5, p. 254, Hud. 

 Hiv. Gr. 



Fig. 450.— Am- 

 pleiopora 

 rohusia fun- 

 nel- s li a ped 

 dlapb rag m, 

 supposed to 

 be a modified 

 oystlpbntgm. 



Fig U9— Araplexopora clngulatn. Tangential 

 section x50, showing wall struciure, and verti- 

 cal section x60. 



discoidea, Nicholson, 1875, (Chetetes 

 discoideue,) Ohio Pal., vol. 2, p. 206, 

 Hud. Kiv. Gr. 

 pustulosa, Ulrich, (in 

 press,) Geo. Sur. 111., vol. 

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

 robusta, Ulrich, 1883, Jour. 

 Cin. Soc. Nat. Hist., vol. 

 6, p. 82. Hud. Riv. Gr. 

 septoea, Ulrich, 1879, (Atac- 

 topora septosa,) Jour. 

 Cin. Soc. Nat. Hist., vol. 

 2, p. 125, Hud. Riv. Gr. 

 superba, Foord, 1883, 

 Cont. to Micropal;i -on- 

 tology, p. 16, Tren- 

 ton Gr. 



winchelli, Ulrich, 1886, 14th Rep. Geo. 

 Sur. Minn., p. 91, Trenton Gr. 

 Ani80tkypa, Ulrich, 1883, Jour. Cin. Soc. 

 Nat. Hist., vol. 6, p. 275. [Ety. anisos, 

 unequal ; tmpa, perforation.] Ramose, 

 hollow, inner side lined with an epi- 

 theca; walls oi tubes thin in the in- 

 terior, and thickened exteriorly ; no 

 interstitial cells or spiniform tubuli. 

 Type A. symmetrica, 

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



vol. 8, pi. 72, St. Louis Gr. 

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



111., vol. 8, pi. 72, St. Louis <ir. 

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



vol. 8, pi. 72, Kaskaskia Gr. 

 symmetrica, Ulrich, 1883, Jour. Cin. 

 Soc. Nat. Hist., vol. 6, p. 76, Kaskas- 

 kia <ir. 

 Archimkde8, LeSueur, 1842, (Retepora ar- 

 chimedes,) Am. Jour. Sci., vol. 4:>, p. 

 19. [Ety. from its resemblance to the 

 machine for raising water, consisting 

 of a tube rolled in a spiral form around 

 a cylinder, invented by Archimedes. 

 Distinguished from Fenestella by its 

 axis and mode of growth ; the flabel- 

 liform expansion acquiring a solid cen- 

 tral axis, around which it revolves in 

 an ascending spiral form, spreading 

 equally in all directions. Type A. 

 wortheni. 



Fio. 461.— Archimedes 

 reversus 



communis, Ulrich, (in press), Geol. Sur. 



111., vol. 8. pi. 63, Kaskaskia Gr. 

 com pact us, Ulrich, 



(iu press), Geol. 



Sur. 111., vol. 8, 



pi. 63, Kaskaskia 



Gr. 

 distans, Ulrich. (in* 



fress), Geol. Sur. 

 11., vol. 8, pi. 

 63,Kaskaskiatir. 

 grandis, Ulrich, 

 (in press), Geol. 

 Sur. 111., vol. 8, 

 pi. 63, Keokuk 

 Gr. 

 intermedins, Ul- 

 rich, (in press), 

 Geol. Sur. 111., 

 vol. 8, pi. 63, 

 Kaskaskia Gr. 

 invaginatus, Ulrich, (in press), Geol Sur. 

 111., vol 8, pi. 63, Kaskaskia Gr. 



UixuH, Hall, 

 1857, Proc. 

 Am. Ass'n 

 Ad. S,-i., 

 vol. 10. p. 

 176, Kas- 

 kaskia Gr. 

 in.-i-k anus, 

 Hall, 1857. 

 Proc. Am. 

 Ass'n Ad. 

 Sci., vol. 10, 

 p. 1 741, Kas- 

 kaskia (ir. 

 ncgligens.Ul- 

 rieh, (in 

 press), Geo. 

 Sur. 111., 

 vol. 8, pi. 

 68, Keokuk 



owenanus, Hall, 1857, Proc. Am. Ass'n 

 Ad. Sci., vol. 10, p. 176, Keokuk Gr. 



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

 111., vol. 8, pi. (13, Kaskaskia Gr. 



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

 111., vol. 8, pi. <i:$, Kaskaskia Gr. 



reversus, Hall, 1858, Geo. R**p. Iowa, p. 

 652, Warsaw Gr. 



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

 HI., vol. 8, pi. 68, Kabkaskia (ir. 



swallovanus, Hall, 1857, Proc. Am. Ass'n 

 Ad. Sci., vol. 10, p. 17(i, Kaskas- 

 kia Gr. 



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

 HI., vol. 8, pi. 63, Kaskask a Gr. 



wortheni, Hall, 1857, Proc. Am. Ass'n 

 Ad. Sci., vol. 10, p. 176, and Geo. Sur. 

 Iowa, p. 651, Warsaw Gr. 

 A rchimedipora, D'Orb., 1850, Prod, de Pal., 

 t. 1, p. 102, syn. for ArchinnuVs. 

 Archimedipora archimedes was too 

 tautological, and by common consent 

 Archimedes has become the generic 

 name. 



archimedes, see Archimedes. 



fio. 462— Archimedes 

 woriheni. 



