THE CRINOIDEA 



177 



'O 



FIG. XCIII. 



Analysis of cup of Codiacrinits 

 \ultzei. * shows position of anus. 



plates in dorsal cup ; with dichotomous arms relatively slightly developed. 

 Genera Codiacrinus, Schultze (1867 ; Follmann, 1887), Devonian, Ger- 

 many (Fig. XCIIL). Lecythiocrinus, White, 

 ( 1 880), Coal Measures of Illinois and Kansas. 

 Both genera little known ; Codiacrinus is 

 compared by Schultze with Myrtillocrinus, 

 by W. & Sp. with Achradocrinus. FAMILY 9. 

 CUPRESSOCRIXIDAE. Cyathocrinoidea with 

 no anal plates in dorsal cup ; anus piercing 

 tegmen ; arms unbranched (or [?] forking few 

 times) ; stem square in section, with an axial and 4 peripheral canals (cf. 

 Lecythocrinus, p. 175). Genera Cupressocrinus, Goldfuss (1826 ; synn. 

 Halocrinus & Cypellocrinus of Steininger ; see W. & Sp., 1886, and 

 Neumayr, 1889), Devonian, Germany and England (Fig. XCIV.). A 

 massive form with basin-shaped cup ; IBB fused (by some held to be a 

 proximale, Fig. XCIV. 3) ; a stout arm, composed of a few large Br in 

 single series, rests on a facet the full width of each R ; large ambulacrals 

 cover the arm-grooves and are taken for pinnules by Zittel ; the solidity of 

 the close-fitting arms renders a plated tegmen unnecessary, but the 5 orals 



Fio. XCIV. 



Cupressocrinus (after L. 

 Schultze). All two -thirds nat. 

 size. 1, C. inflatus, complete 

 crown. 2, C. abbreviatus, ventral 

 surface of calyx, slightly modi- 

 fied ; shows "consolidating ap- 

 paratus" of five plates (A), here 

 regarded as orals, between which 

 are the passages (v.g) for organs 

 of the ventral groove other than 

 the food-groove ; a.c, axial canal 

 of radial ; As, passage for rectum. 

 3, infrabasal circlet of same, from 

 below, showing sutural surfaces 

 (s) for basals, axial canal, and 

 peripheral canals (p.c). 



characteristic of Cyathocrinoidea are retained as a frame (" consolidating 

 apparatus " of authors) around the ventral surface of the cup, post. O 

 being 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 affinities 

 with Gasterocomidae. FAMILY 10. GASTEROCOMIDAE. Cyathocrinoidea with 

 anus in side of cup, at a level varying with the genus, either above or 

 below x, which is always within limits of cup. Arms apparently small, 

 borne on a narrow horseshoe-shaped facet, with distinct axial canal. O 

 for most part covered by Arab, post. O a large madreporite. IBB small, 

 often fused into 3 plates or 1. Stem usually of Cupressocrinid type. 

 Genera Gasterocoma, Goldfuss (1839, W. & Sp., 1886 ; Jaekel, 1895 ; 

 synn. Epactocrimis and Ceramocrinus, J. Miiller, 1855), Devonian, Ger- 

 many ; anus below a-, which is in line with RR ; IBB fused into one. 

 Nanocrinus, J. Miiller (1856, Schultze, 1867), Devonian, Eifel ; like 



