A treatise on zoology . ny (Fi;^^ XOIIL). Lecythiorriiias, White,(1880), Coal Measures of Illinois and j^unui-a litth; known ; CodiarriNvs iscompared by Schultze with MijrtUlocrinux,by W. & Sp. with Achradocrinns. Family Cyatliocrinoidea withno anal plates in dorsal cup ; anus piercingtegmen ; arms unbranched (or [?J forking fewtimes) ; stem scpiare in section, with an axial and 4 peripheral canals (;^ \). 175). Genera — Civpressocrinns, Goldfuss (1826 ; synn,Halocrinus & Cijpellocrinus of Steininger ; see W. & Sp., 1886, andNeumayr, 1889),
A treatise on zoology . ny (Fi;^^ XOIIL). Lecythiorriiias, White,(1880), Coal Measures of Illinois and j^unui-a litth; known ; CodiarriNvs iscompared by Schultze with MijrtUlocrinux,by W. & Sp. with Achradocrinns. Family Cyatliocrinoidea withno anal plates in dorsal cup ; anus piercingtegmen ; arms unbranched (or [?J forking fewtimes) ; stem scpiare in section, with an axial and 4 peripheral canals (;^ \). 175). Genera — Civpressocrinns, Goldfuss (1826 ; synn,Halocrinus & Cijpellocrinus of Steininger ; see W. & Sp., 1886, andNeumayr, 1889), Devonian, Germany and England (Fig. XCIV.). Amassive Ibrm witli basin-shaped cuj) ; IBB fused (by some held to be aproximale, Fig. XCIV. 3): a stout arm, composed of a few large Br insingle series, rests on a facet the full width of each R; large ambulacralscover the arm-grooves and are taken for pinnules by Zittel ; the solidity ofthe close-titting arms renders a plated tegmen unnecessary, but the 5 orals. Fig. XCIV. Cupressocrinus (after ). All tvvo-tliirds 1, C. injlatus, completecrown. 2, C. ahbreviatus, ventralsurface of calyx, slightly modi-fied ; shows consolidating ap-paratus of five ])lates (A), hereregarded as orals, between whichare the passages () for organsof the ventral gn^ove other tliauthe food-groove ; , axial canalof raflial; As, passage for , infrabasal circlet of same, frombelow, showing sutural surfaces(s) for basals, axial canal, andperipheral canals (i>.c). characteristic of Cyathocrinoidea are retained as a frame ( consolidatingapparatus of authors) around the ventral surface of the cup, j^ost. 0being larger than the others and pierced for the rectum (Fig. XCIV. 2).Myrtillocrinus, Sandberger (1855, syn. Ancyrocrinus, Hall, see p. 134,Fig. LI.), Devonian, Germany, and N. America ; may have closer affinitieswith Gasterocomidae. Family 10. Gasterocomidae. Cyathocrinoidea withanus in side of cup, at a level varying with
Size: 1607px × 1554px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
