ECHINOIDEA. (iv, c.) Echin . 67 
Paracentrotus descr. ; Delage (54) p. 243, fig. : diagnosis ; Meissner in 
Hamann (112) p. 1370. P. lividus ; Delage (54) p. 243. 
Parasalenia descr. ; Delage (54) p. 245 : diagnosis ; Meissner in 
Hamann (112) p. 1375. P. gratiosa , compared with P. pohlii, pedi- 
cellariae ; de Meijere (57) p. 97, pi. xvii : pedicellariae, incl. P . 
pohlii , young, specimen recorded from Zanzibar, Bell 1903, is St'omo- 
pneustes variolaris ; Mortensen (195) p. 121, pi. v. 
Parasaleniinae ; Delage (54) p. 245. 
Paraster discussed ; Fourtau (83) p. 435. 
Parechininae ; Delage (54) p. 242. 
Parecliinus descr. ; loc. cit., figg. : diagnosis ; Meissner in Hamann (112) 
p. 1368. P. microtubcrculatus, P. miliaris ; Delage (54) p. 242. 
\Pedina ; Delage (54) p. 233. P. arenata (p. 170), P. gigas (p. 169) ; 
Lissajous (153). P. lithographica ; Walther (281) p. 167. P. sub- 
laevis ; Maire (178) : Lissajous (153) p. 169 : not typical form ; 
Lambert in Review. 
Pedinidae should include Pedina , Caeno -, Pseudo -, Micro-, Leio -, Echino-, 
Hemi -, Phymo-,h Palaeo-pedina, Mesodiadema , Echinopsis , Diademopsis , 
Hecistocyphus , Orthopsis , Miorthopsis , Gymnodiadema ; Mortensen 
(195) p. 46. 
Pedininae defined with list of genera ; Delage (54) p. 233. 
t Pedinothuria ; Delage (54) p. 235 : referred to Pseudodiadematidae ; 
Mortensen (195) p. 52. 
t Pelanechinus descr. ; Delage (54) p. 224. 
\Peltastes : — P. clathratus ; Collet (44) p. 77. P. stellulatus ; Strang- 
ways (266). P. aff. stellulatus ; Zlatarsk! (299). Peltaster [sic] 
umbrella ; Fortin (81). 
Periaster ; Delage (54) p. 271 : distinguished ; Tornquist (268) p. 392. 
P. limicola not this genus ; loc. cit. : of Challenger Rep. pi. xxxv&, 
f. 1-4 is not this sp. ; Agassiz (3) p. 210. tP. oblongus vide sub 
Linthia. P. tenuis descr., compared with P. limicola & Hemiaster 
bufo ; Agassiz (3) p. 209, pis. ciii-cv. 
Peripatagus , — Pcrypatagus [sic] ; Delage (54) p. 271 : diagnosis ; 
Meissner in Hamann (112) p. 1391. 
'\Pcrischodomus defined, synn. Perischocidaris , Homotoechus , Tretechinus 
(p. 18), P. biserialis descr. (p. 18), P. hartei descr. (p. 19), P. illinoiensis 
descr., P. magnus (p. 20) ; Klem (142). 
\Perischoechinidae defined as Suborder with Famm. Lepidocentrus -, 
Lepidesthes-, Archaeocidaris -, Melonites -, & Tiarechinus-inae ; Delage 
(54) p. 217, 218. 
t Perischoechinoida defined ; Klem (142) p. 15. 
\Permocidaris ; Klem (142) p. 74. 
Peronella discussed, merged in Laganum (q. v.), P. pellucida ; de 
Meijere (57) p. 130. 
f Peroniaster nasutulus, vide sub Hemiaster. 
Petalocidaris vide sub Cidaris ; Delage (54) p. 227 : rejected ; Agassiz 
(3) p. 22. 
f Pholidocidaris defined (p. 22), P. gaudryi (p. 23), P. irregularis incl. 
P. meeki , descr. (p. 22), P. tenuis (p. 23) ; Klem (142). 
Phormosoma descr. ; Delage (54) p. 221 & fig. P. sp. ; Bell (22a). P. sp. 
(p. 32, pi. xii), P. alternans descr. (p. 31, pis. iii, xii), P. bursarium , young 
individuals, discussion of Agassiz’ figures of young Phormosoma (p. 28) ; 
de Meijere (57). P. hispidum descr., growth changes (p. 86, pis. a, b, 
xxx-xlix, also p. 76-79), P. panamense descr. (p. 101, figg.); Agassiz (3). 
P. placenta juv. descr. ; op. cit. p. 100, pis. xliii, xlviii : protechinus 
stage ; Mortensen (195) p. 64, fig. P. verticillatum n. sp., B. of 
Bengal, 678 fm. ; Mortensen (194) p. 90, pi. iv, v. P. zealandiae 
n. sp., Challenger Station 169 = Asthenosoma gracilel of Chall. Rep. ; 
Agassiz (3) p. 105, pi. li. 
