68 Echin. 
XIV. ECHINODERMA. 
[1904] 
Phrissocystis (v. etiam^sub Argopatagus) ; Delage (54) p. 273 : diagnosis ; 
Meissner in Hamann (112) p. 1403 : discussed ; Agassiz (3) p. 186. 
P. aculeata descr. ; op. cit. p. 187, pis. Ixxx-xc. P. huviilis descr. ; 
DE Meijere (57) p. 198, pis. x, xxiii : criticised ; Agassiz (3) p. 187. 
Phyllacanthus (v. etiam sub Cidaris) ; Delage (54) p. 227. P. australis; 
DE Meijere (57) p. 12. P. baculosa (p. 138). P. imperialis (p. 139) ; 
Herdman (120). 
^ Phymosoma^ vide sub CypJiosoma. 
Pilematechinus n. g. of Urechinidae for Cystechinus rathhuni A. Ag. geno- 
type and C. vesica A. Ag. (p. 163), P. rathhuni descr. (p. 165, pis. Ixxxi- 
Ixxxvi, also p. 122, 124, 130) ; Agassiz (3). 
Plagiobrissus, vide Metalia. 
Platyhrissus (seu -hryssus) ; Delage (54) p. 273 : diagnosis ; Meissner in 
Hamann (112) p. 1388. 
Plesianthus^ diagnosis ; Meissner in Hamann (112) p. 1382. 
Plesiodiadema Pomel, rejected in favour of Dermatodiadema A. Ag. ; 
Agassiz (3) p. 59 : replaces Dermatodiadema (q. v.) ; Mortensen 
(195) p. 38. 
\ Plesiolampas discussed ; Bather (18) p. 292 : probably not to be 
separated from Oriolampas ; Lambert in Eeview. P. saharae n. sp., 
Eocene, Garadimi & Tamaske in Sokoto; Bather (18) p. 293 &ligg., 
pi. xi : see also Oppenheim (201) p. 253, 283. 
Plesiozonus ; Delage (54) p. 273 : diagnosis ; de Meijere (57) p. 177 & 
Meissner in Hamann (112) p. 1389 : discussed ; Agassiz (3) p. 183. 
P. hirsutus^ descr. ; de IVEeijere (57) p. 178, 240^ pis. vii, xxii. 
Pleurechinus ; Delage (54) p. 241 : distinguished fr. Temnopleurus ; 
Mortensen (195) p. 91. P. hoihryoides, descr., probably incl. Temno- 
pleurus toreumaticusi juv. Sladen 1879, and Temnechiiius scillae 
Mazzetti 1894 ; de Meijere (57) p. 77, pi. xvi, but see p. 202 : holo- 
type descr., pedicellariae, spicules, &c. ; Mortensen (195) p. 83, 
pis. vi, vii. P. doederleini n. sp., G. of Siam, 5-9 fm. ; op. cit. p. 77, 
pis. i, ii, vi, vii. P. maculatus n. sp., Macclesfield Bank, = " 2^(ym7^o- 
pleurus hothryoides " Bell, and other Indo-Pacific locc. ; op. cit. p. 89, 
pi. i : also with P. reticulata n. sp. ; Mortensen in de Meijere (57) 
p. 202, 228. P. ruher^ maintained (p. 82), pedicellariae, &c. (p. 84, 
pi. vi, vii), P. scillae (Mazzetti sub Temnechinus) holotype examined, 
species redescr., incl. P. reticulatus Mrtnsn in Meijere (p. 86, pis. i, ii, 
vi, vii) ; Mortensen (195). P. siamensis n. sp., G. of Siam, 3-38 fm., 
and other Indo-Pacific locc, n. var. pidchellus, Amirante and Maldive 
Is. ; op. cit. p. 79, pis. i, ii, vi, vii : also Mortensen in de Meijere 
(57) pp. 202, 228. P. vw, iahilis ; de Meijere (57) p. 79, 202 : these 
specimens are partly Genocidaris sp. nondescr. (p. 94), but the species 
is an Opecliinus (p. 82), P. variegatus n. sp., Formosa Channel and 
Japanese Seas (p. 84, pis. i, ii) ; Mortensen (195). 
Plexechinus ; Delage (54) p. 267 : diagnosis ; Meissner in Hamann (112) 
p. 1405 : discussed, compared with Urechinus et al. ; Agassiz (3) 
p. 148. P. ductus^ descr.; op. cit. p. 150, pis. Iv, Iviii-lx, also p. 130. 
Podocidaris ; Delage (54) p. 237. P. sp., young, compared with P. 
prionigera and P. sculpta ; de Meijere (57) p. 68, pi. xvi. 
Porocidaris ; ' Delage (54) p. 228, fig. : discussed ; Agassiz (3) p. 24. 
P. cobosi, shape of test (p. 1, f. 4), size of actinal system (p. 3, f. 13), 
anal plates in young (p. 6, f. 20, 21), grow'th of coronal plates (p. 11, 
f. 30-42), descr. and discussed (p. 29, pis. ix-xiii) ; Agassiz (3). 
P. maculicollis, vide Cidaris. P. milleri ; de Meijere (57) p. 27 : 
shape of test (p. 1, f. 6), growth of ambulacrals (p. 2, f. 7-10), size of 
actinal system (p. 3, f. 11) anal plates in young (p. 5, f. 16-19). descr. 
and discussed (p. 25, pis. vi-viii, x) ; Agassiz (3). +P. pseudoserrata ; 
Checchia (37). tP. schmideli ; Dainelli (49) p. 192, & (50). 
Pourtalesia, descr. ; Delage (54) p. 266, figg. : diagnosis ; Meissner in 
