CYSTIDEA, BLASTOIDEA, INCERT7E SEDIS. Echin. 135 
Thuriocystis , nom. nov. ; Haeckel (117) p. 402 : genus hypotheticum, with 
genotype T. pentadeealis , species hypothetica, belonging to Ascocystida ; 
Haeckel (118) p. 124. 
Tiarocrinus quadrifrons , doubtfully referred to Staurocystis ; Haeckel 
(118) p. 134. 
. Trigonocystis , n. g., with type T. trigona , incl. Trochocystis bohemica , 
Barr. var. pi. iii, figg. 29-38, Cambrian, Bohemia; Haeckel (118) 
p. 38, pi. ii : n. sp. 
Trinemacystida , subfam. nov. of Palceocystida , for Arachnocystis and Trine- 
macystis ; Haeckel (118) p. 64. 
Trincmacystis , n. g., with type T. triactis (3-rayed var. of Echinosphcera 
aurantiuvi), perhaps inch E. gyllenhali Quenst., Ordovician, Scandi- 
navia; Haeckel (118) p. 65 : n. sp. 
Trochocystis ; Haeckel (117) p. 398: redefined; Haeckel (118) p. 38. — 
T. bohemicus of Jahn (48) Zool. Bee. 1894, p. 271, is Stromatocystis ; 
Jahn (145) p. 660, see also pp. 697, 701, 719, 731, 732, 740, 743, 745, 
742: various plates; Pompeckj (268) p. 503, ph xiii: redescribed; 
Haeckel (118) p. 38. 
(H.) — tBLASTOIDEA. 
Defined (p. 452), classified (p. 460) : Order i. Eublastoida or Pentremi- 
taria ( Codonasterida , Orophocrinida , Elmacrinida , Pentremitida). 
Order n. Parblastoida or Astrocrinaria ( Eleutherocrinida , Astrocrinida ) ; 
Haeckel (116). 
General account; Koken (171) p. 286. — General account, classification 
follows Etheridge & Carpenter ; Zittel (356) p. 158 : with additional 
notes by Wachsmuth; Zittel- Eastman (357) p. 188. 
Blastoidea, derived from Cystoblastus ; Jaekel (141) : relations to Cystidea, 
Blastoidocrinus , Asteroblastus , and Astrocystis (Whiteaves non Haeck.); 
Whiteaves (345) p. 291. 
Codaster jessiece, Chouteau limestone, Sedalia, Mo. ; Miller & Gurley 
(234) Bull. Illinois Mus. x, p. 89, ph v, n. sp. 
Orophocrinns fusifonnis, restored figure; Bather (28) p. 101. 
Pentremitidea, diagrammatic restoration (p. 835, fig. 11). — P. sp. ? eifelensis, 
described, section across theca (p. 831), P. cf. gilbertsoni, described, 
section of hydrospires (p. 829, ph xxvi) ; Oehlert (250). 
(K.) — flNCERTiE SEDIS. 
“Spheroidal bulb, of nodose, sculptured plates” ; Miller & Gurley (235) 
Bull. Illinois Mus. xii, p. 46, ph ii. 
Spatangopsis, see under IV, C. 
