68 flchin , 
XIV. ECIIINODERMA. 
[ 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. lxxx-xc. P. humilis 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). 
t Phymosoma, vide sub Cyphosoma. 
Pilematechinus n. g. of Urechinidae for Cystechinus rathbuni A. Ag. geno- 
type and C. vesica A. Ag. (p. 163), P. rathbuni descr. (p. 165, pis. lxxxi- 
Ixxxvi, also p. 122, 124, 130) ; Agassiz (3). 
Plagio brissus, vide Metalia. 
Platybrissus (seu - bryssus ) ; 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. 
fPlesiolampas discussed ; Bather (18) p. 292 : probably not to be 
separated from Oriolampas ; Lambert in Review. P. saharae n. sp., 
Eocene, Garadimi & Tamask^ in Sokoto; Bather (18) p. 293 &figg., 
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 Meijere (57) p. 178, 240, pis. vii, xxii. 
Pleurechinus ; Delage (54) p. 241 : distinguished fr. Temnopleurus ; 
Mortensen (195) p. 91. P. bothryoides, descr., probably incl. Temno- 
pleurus toreumaticus% juv. Sladen 1879, and Temnechinus 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, = “ Temno- 
pleurus bothryoides ” Bell, arid other Indo-Pacific locc. ; op. cit. p. 89, 
pi. i : also with P. reticulatus n. sp. ; Mortensen in de AIeijere (57) 
p. 202, 228. P. ruber , maintained (p. 82), pedicellariae, &c. (p. 84, 
pi. vi, vii), P. scillae (Mazzetti sub Temnechinus) holotype examined, 
species redescr., incl. P. reticulatus Alrtnsn in AIeijere (p. 86, pis. i, ii, 
vi, vii) ; AIortensen (195). P. siamensis n. sp., G. of Siam, 3-38 fm., 
and other lndo-Pacific locc., n. var. pidchellus , Amirante and Alaidive 
Is. ; op. cit. p. 79, pis. i, ii, vi, vii : also Mortensen in de Meijere 
(57) pp. 202, 228. P. variabilis ; de Meijere (57) p. 79, 202 : these 
specimens are partly Genocidaris sp. nondescr. (p. 94), but the species 
is an Opechinus (p. 82), P. variegatus n. sp., Formosa Channel and 
Japanese Seas (p. 84, pis. i, ii) ; Mortensen (195). 
Plexechinus ; Delage (54) p. 267 : diagnosis ; AIeissner in Hamann (112) 
p. 1405 : discussed, compared with Urechinus et al. ; Agassiz (3) 
p. 148. P. cinctus , descr.; op. cit. p. 150, pis. lv, lviii-lx, also p. 130. 
Podocidaris ; Delage (54) p. 237. P. sp., young, compared with P. 
prionigera and P. sculpta ; de AIeijere (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), growth of coronal plates (p. 11, 
f. 30-42), descr. and discussed (p. 29, pis. ix-xiii) ; Agassiz (3). 
P. macidicollis , 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). tP. pseudoserrata ; 
Checchia (37). tP. schmideli ; Dainelli (49) p. 192, & (50). 
Pourtalesia , descr.; Delage (54) p. 266, figg. ; diagnosis; AIeissner in 
