BLASTOIDEA. (iV, H.) 
Echin. 99 
Scoliocystis, n. g. (p. 257), with genotype Caryocystites pumilus Eichw. 
(p. 260, pi. xi and text-fig.), and S. thersites, n. sp., probably Vagi- 
natenkalk, St Petersburg (p. 260, pi. xi, text-fig.); Jaekel (130). 
Sphaerocystis {-ites), rediagnosed (p. 288); S. dolomiticus , n. sp., Niagara 
limestone, Chicago (p. 289, text-fig.); S. multifasciatus, rediagnosed 
(p. 289): Jaekel (130). 
Sphaeronidce, defined ; Bather (22) p. 920: redefined and fully discussed ; 
Jaekel (130) p. 390. 
Sphaeronis (- ites ), rediagnosed, with synn. Pomocystis, Pomosphaera 
Haeckel, et alia (p. 396); S. arachnoides Forbes, referred to Echino- 
sphaera (p. 337); S. globulus , rediagnosed (p. 398, pi. iv); S. oblonga, 
rediagnosed with synn. S. minuta and S. uva Ang. and ? S. sulcifera 
Ang. (p. 398); S. pomum , rediagnosed (p. 398); S. stelluliferus Salter, 
referred to Echinosphaera (p. 337): Jaekel (130). 
Staurocystinae , subfam. of Callocystidae , for Pseudocrinus and Stauro- 
cystis ; Jaekel (130) p. 282. 
Staurocystis, rediagnosed (p. 285); S. quadrifasdata (oliin Pseudocrinus) 
(p. 286, text-fig.): Jaekel (130). 
Stichocystis, n. g. (p. 325) with genotype S. geometrica , n. sp. [sic, but 
name is Angelin’s, who figured it], Mid. Ordovician, Scandinavia ; 
Jaekel (130) p. 327, pi. ix. 
Streptaster, vide Agelacrinidce. 
Stribalocystis {-ites), discussed (pp. 150, 312), S. gorbyi is perhaps a Caryo- 
crinus , and S. tumidus a Corylocr. (p. 313) ; Jaekel (130). 
Stromatocystis {-ites), vide Agelacrinidae : rediagnosed and discussed 
(p. 36) ; S. balticus, n. sp., Middle Cambrian of Baltic province 
(p. 42, pi. ii) ; S. p ntangularis, redescr. (p. 42, pi. ii and text-figg.) ; 
Jaekel (130). 
Strophocrinus, Sardeson ; see under iv f. 
Tetracystidae, ? n. fam., pro Rhombifera Barr, pars and Tiaracrinus ; 
Jaekel (130) p. 340. 
Thecocystidae, n. fam. of Thecoidea {= Edrioasteroidea) inch Stromato¬ 
cystis, Cyathocystis, Thecocystis, Dinocystis, Cystaster, and Edrioaster ; 
Jaekel (130) p. 35. 
Thecocystis, n. g. with genotype T. sacculus, n. sp., Hudson Biver 
group, Cincinnati, Ohio { — Cystaster gramdatus Hall, pars); Jaekel 
( 130) p. 43, pi. i. 
Thecoidea, nom. I10V. pro Edrioasteroidea, defined as Class of Echino- 
derma, and fully discussed; Jaekel (130) p. 9. 
Tiaracrinidae, defined ; Bather (22) p. 920. 
Tiaracrinus, rediagnosed, with syn. Staurosoma Barr, non Will. (p. 343); 
T. quadrifrons, rediagnosed (p. 345) ; T. rams Barr, (sub Staurosoma) 
rediagnosed (p. 345); T. soyei, redescr. with syn. T. oehlei'ti Schlueter 
(p. 345): Jaekel (130). 
Trematocystis, n. g. (p. 413) with genotype T. subglobosus Miller (as 
Holocystites) (p. 414, pi. iv); Jaekel (130). 
Trochocystis {-ites), single plate, Cambrian (Division 1 b) Long Id.; 
Matthew (171) p. 128. 
(H.)—fBLASTOIDEA. 
Index to all genera and species with synonjuns and references, with list of 
all specimens in British Museum ; Bather (26). 
Blastoidea, redefined, and divided into Grades Protoblastoidea and 
Eublastoidea, qq.v.; Bather (22) p. 920. 
t All extinct. 
