ECHINOIDEA. (iV, C.) 
Ecliin. 77 
includes most of Nucleolites Desor non Lam., and Ochetus Pomol 
(p. 164); N. bourgeois i, discussed (p. 171); N. coravium , redescribed 
(p. 168, pi. v); Lambert (180). 
\Off aster \ — 0. corculum and 0. pilula; Stolley (319) p. 147, & (320) pp. 
247, 272. 
t Oligoporus: — 0. bellulus (p. 193); 0. blairi (p. 193); 0. coreyi , arrange- 
ment of plates fully described and their development discussed (p. 
186, pi. vi); 0. dance , arrangement of plates fully descr., spines (p. 
193, pi. vi); 0. nobilis & 0. sidcatus (p. 193); Jackson (139). 
0. missouriensis, Augusta Limestone ?, Webb City, Mo., arrangement of 
plates fully described; Jackson (139) p. 184, pi. ix, n. sp. 
f Oppissaster cotteri , Tertiary of Portugal, liolotype in Lisbon Museum; 
Loriol (193) Mem. Direc. trav. Geol. Portugal, p. 45, pi. xiii, n. sp. 
\Orthocyphus , n. g., with genotype 0. pulchellus Cotteau (olim Orth- 
echinus et Cyphosoma ), and including 0. boreaui (ohm Orthechinus ) ; 
Arnaud (14) Act. Soc. Bordeaux, xlviii, p. 234: syn. of Thylechinus ; 
Lambert (179) p. 496. 
\Orthechinus , syn. of Thylechinus ; Lambert (179) p. 496. — 0. boreaui and 
0. pulchellus , compared with genotype, and removed to nov. gen. 
Orthocyphus ; Arnaud (14) p. 232. — 0. boreaui , referred to Thyl- 
echinus ; Lambert (179) p. 504. 
■\Orthopsis : — 0. repelini; Kilian (157) p. 768. — 0. zumofeni ; Loriol 
( 195) p. 153. 
O. perlata , Moestrichtian, Mari Hills, Baluchistan; Noetling( 248) Pal. 
Ind. (16) i, pt. 3, p. 12, pi. ii, n. sp. 
\Palaechinoidea , sub-cl. defined, includes orders Cystocidarida , Bothrioci- 
darida , Perischoechinida ; Zittel (356) p. 182; Zittel-Eastman 
( 357) p. 218. 
t Palaechinus, compared with Rhoechinus; Jackson (139) p. 200: literary 
history, rediagnosis; Tornquist (327) p. 735. — P. gigas, ambulacrals 
(p. 190), ambulacrals and interambulacrals described (p. 204, pi. vii) ; 
Jackson (139): intcrambulacral from Regny; Julien (151) p. 130. 
— P. paradoxus is a cup of Platycrinus ; Jaekel (144) p. 48. — P. (?) 
sp., Upper Silurian, N. S. W. ; Mitchell (236) with fig. 
P. konincki , Carboniferous Limestone, Regny, Neronde, and St-Germain- 
Laval, Central France; Julien (151) p. 130, pis. x & xi; Torn- 
quist (327) p. 753. — P. lacazei , Carboniferous Limest., l’Ardoisikre, 
Central France; Julien (151) p. 128, pi. xvi : redescr., stages of 
growth, comparison with other spp., nearest P. gigas ; Tornquist 
(327) p. 742, pis. xx & xxi. — P. robineti , Carboniferous Limest., 
La Yarville, Siguret, Central France; Julien (151) p. 129, pi. iii: 
why not Rhoechinus ? Tornquist (327) p. 753. — P. rutoti , Carboni- 
ferous Limest., Domaine des Roches near Savigny-Poil-Fol, Central 
France; Julien (151) p. 129, pi. vi: ? identical with P. lacazei ; 
Tornquist (327) p. 753 : n. spp. 
+ Palceodiscidce, diagnosis; Gregory (109) p. 133. 
t Palceodiscus ferox , structure, especially of ambulacra and jaws, affinities 
discussed; Gregory (109) p. 129. 
Palceolampas Bell, not accepted; Loriol (193) p. 39. 
f Palceopneustes cristatus , young stages in development of plastron ; Lam- 
bert (178) p. 323. 
t Pedina charmassei ; Hug (133) p. 404. 
\ Pedinothuria, n. g., with genotype P. cidaroides, Weisser Jura (? y), 
Germany; Gregory (108) Quart. J. Geol. Soc. liii, p. 119, pi. vii, 
n. sp. 
f Peltastes studeri\ Kilian (158) p. 894. 
Periaster not accepted ; Loriol (195) p. 175. 
t Pericosmus: — P. cequalis ; Mazzetti (225) p. 428; Botto-Micca (41) p. 
