90 



SMITHSONIAN INSTITUTION 



PLATE XLII 

 (All figures natural size except where otherwise stated) 



Figs. 1-9. Synerocrinus incurvus (Trautschold) 



(Also on Plate LXXV) 



Fig. I. One of the types, Trautschold, 1867, taf. 4, fig. 4; also 1879, taf. 14, fig. 11 ; posterior view. 



After Trautschold's photograph of the original. Natural size. Mineralogical 



Museum, Breslau, Germany. 

 20. Cotype, 1867, fig. 5 ; smaller specimen, posterior view. After Trautschold. Same collection, 

 26. Basal view of same ; after Trautschold. Shows IBB entirely covered by column. 

 3. A very mature specimen, anterior view; some calyx plates restored as indicated by dotted 



lines; ant. ray slightly malformed. This specimen shows the strong development of 



iBr, extending not only to the third bifurcation but between the bases of ramules and 



the main trunks of the rays. Author's collection. 

 40. Adult specimen, left anterior view, showing iBr only to the second bifurcation ; base of 



1. post, ray restored. Author's collection. 

 46. Basal view of same, showing relative size of BB and IBB ; drawn with 1. ant. ray up. 



IBB entirely within the ring of BB. 

 5a. Smaller specimen, posterior view; a small iBr between IIIBr. Shows the truncate post. B, 



and space occupied by first anal plate. Author's collection. 

 5&. Ventral side of VII Br of same specimen, showing perisome and the grooves covered by it. 



X2. 

 6a. Young specimen with iBr extending only to IIBr; 1. post, view; plates of anal tube in situ; 



first anal plate united to IBr at the right. Author's collection. 

 6b. Distal view of same, showing infolded arms nearly to the end. 

 7. Sketch of anal structures, showing the limits of sutural union of first anal plate, perisome 



omitted; constructed from original of figs. S, 6, 8. 

 8ff. A dissected specimen with oral plates and tegmen partly preserved. Shows the posterior 



oral; calcareous integument; articular and sutural surfaces of calyx plates with 



deep fossae on many. Right posterior interradial view of calyx, and proximal part 



of stem, with r. post, and r. ant. rays removed; showing articulations on distal faces 



of BB and lateral faces of ant. R and IBr, and post. B ; also the sutural connection of 



first anal plate with post. B and lower half of 1. post. R. X 2. Author's collection. 

 8b. Right sutural margin of r. post. R and IBr. X 2. 

 8c. Distal articular face of r. post. IBn, showing thickening toward the anal area where first 



anal plate was attached. X 2. 

 8d. Left sutural margin of r. ant. R and IBn and 2. X 2. 

 8e. Distal face of r. ant. IBr: (axillary) and adjoining iBr. X 2. 

 8/. Left sutural margin of IIBr: and 3. X 2. 

 8^. Proximal face of 1. post. iBr, second range. X 2. 

 8/j. Lateral face of iBr in second range. X 2. 

 8i. Distal face of IVBr. X 2. 

 8k, I. Proximal and distal faces of VIBrs. X 2. 

 8m. Ventral side of IVBr, showing calcareous integument. X 2. 

 8». Ventral view of calyx of same specimen, with r. post, and r. ant. plates replaced 



the large posterior oral perforated like a madrepore, and two smaller ones ; 



space occupied by first anal plate, with sutural connection as shown in fig. 8a, 



for nearly full length of r. post. IBn. X 2. 

 80. Detail of posterior oral, photographically enlarged to show the pores. X 8. 

 9. Distal portion of arms of a mature specimen much more flattened than in others 



a different species. Author's collection. 



Kalkbruche. LIpper part of Lower Carboniferous. 



All the specimens are from a single locality near Moscow, Russia, associated with 

 Cromyocrinus, Ettpachyocrimts, Phialocrinus, Stcminatocrinns, etc. The fauna 

 is comparable to that of the Kaskaskia in America, and to that of the Hurlet lime- 

 stone in Scotland. 



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Shows 

 and the 

 and also 



perhaps 



