1881.] NATURAL SCIENCES OP PHILADELPHIA. 323 



*1861. Teleiocr. clivosus Hall. (Actinocr. clivostis) Bost. Journ Nat. Hist., p. 



274. Upper Burlington limest. Burlington. Iowa. 

 *1S61. Teleiocr. erodus Hall. (Actinocr.— Calathocr—erodus) Desc New Sp. 



Crin , p. 12; Meek and Worthen, Strotocr. (Dj, (ieol. Rrp. 111., ii, p. 190. 



Upper BurlinfTtnn limest. Burlington, Iowa. 

 »1861. Teleiocr. insculptus Hill. (Actinocr.— Calathocr.—insculptus) Pes'-. 



New Sp. Crin., p. 12; Meek and Worthen, Strotocr. (B), Geol. Rep 111., v, 



p. 348. Upper Burlington limest. Burlington, Iowa. 

 *1S61. Teleiocr. liratas Hall. (Actinocr. liratus) Supp. (ieol. Rep. Iowa, PI. 4, 



fig. 3; Meek and AVorthen. Strotocr. (B) liratus, fteol. Rrp. 111., ii, p. 190; 



Ibid., V, p. 355, fig. 2. Upper Burlington limest. Burlington, Iowa. 

 Syn. Actinocr. subumbrosus Hall. Suppl. Geol. Rep. Iowa, p. 3. 

 *1860. Teleiocr. rudis Hall. (Actinocr. rudis) Supp. Geol. Rep. Iowa, p. 33. 



Upper Burlington limest. Burlington. Iowa. 

 *18fil. Teleiocr. tenuiradiatus Hall. (Actinocr. tenuiradiatus, not 1847= Pnlmn- 



cystites tenmradiatus.) Desc. New Sp. Crin., p. 12: Meek and Worthen, 



Strotocr. (B) tenuiradiatus, Geol. Rep. 111., v, p. 349. Upper Burlirgton 



limest. Burlington, Iowa. 

 *1858. Teleiocr. umbrosus Hall. (Actinocr. umbrosus) Type of the genus. 



Geol. Rep. Iowa, i, pt. ii, p. 590, PI. 11, figs. 3 a, b ; Meek and Worthen, 



Strotocr. (B) umbrosus, Geol. Rep. 111., ii, p. 190; Ibid., v, p. 360, PI. 8, 



fig. 5. Upper Burlinston limest. Burlington, Iowa. 

 .Syn. Actinocr. delicatus Meek and Worthen, 1869. Proc Acad. Nat. Sci. 



Phila., p. 156 : also Geol. Rep. 111., v, p. 343, PI. 8, fig. 2. 

 This is described from a very young specimen of this genus, and e.xbibits most 



remarkably all the characteristics of Actinocrinus. 



17. STEGANOCRINUS Meek and Worthen. 

 (PL 18, figs. 3, 4, 5.) 



1866. Meek and Worthen. Geol. Rep. 111., ii, p. 195. 



1868. Meek and Worthen. Ibid., ill, p. 475. 



1878. Wachsm. and Spr. Proc. Acad. Nat. Sci, Phila., p. 243. 



1878. Zittel. (Subgenus of Actinocrinus.) Handb. der Palaeont., p. 370. 



Syn. Actinocrinus (in part) Sbumard, 1855, Geol. Rep. Missouri 



by Swallow, pt. ii, p. 189; Hall, 1858, Geol. Rep. Iowa, i, pt. ii, 



pp. 577, 582 ; Meek and Worthen, 18G0, Proc. Acad, Nat. Sci. 



Phila., p. 387. 



The relations of this genus with Actinocrinus and Teleiocrinus 

 have been fully discussed in our general remarks upon the family. 



Generic Diagnosis. — General form of the body like Actino- 

 crinus. The rays extended into long tubular appendages, which 

 bear the arms on both sides ; dome with subcentral anal tube ; 

 surface ornamented b}" radiating ridges passing from plate to 

 plate, and meeting in a small tubercle at the middle of each. 



Basals three, forming a low cup. Primary radials 3 X 5, large ; 

 the first much larger than the others, hexagonal and heptagonal ; 



