ASTER01DEA. IV, 1). Edl. 47 
Phoxaster pumilus , Sladen, is young of Bathybiaster robust us ; Verrill 
( 125) p. 256. 
Plutonastcr, diagnosed, discussed, distribution of species ; Perrier (92) 
p. 312. P. agassizi, variations, and G-rayed ; Yerrill (125) p. 248. 
P. bifrons ; Marenzeller (75) p. 3 ; discussed ; Perrier (92) 
p. 314. P. edioardsi , diagnosed ; l. c. P. ejjlorescens , discussed 
(p. 322), P. inermis , redescribed (p. 319), P. inter mediris, redescribed, 
compared with P. rigidus (p. 316), P. notatus, variations from type 
(p. 318), P. pulcher , discussed (p. 322) ; Perrier (92). P. rigidus, 
and var. semiarmata , Sladen, syn. of P. agassizii ; Verrill (125) 
p. 248. . 
Pontaster , diagnosed, distribution of species; Perrier (92) p. 286. P. 
hehitus, compared with P. tenuispinus ; Verrill (125) p.247. P. 
Jiispidus , figured ; Alcock (2). P.forcipatus ; Verrill (125) p. 247. 
P. marionis , redescribod and figured ; Perrier (92) p. 290. P. sepi- 
ius , redescribed ; Yerrill (125) p. 247. P. tenuispinus ; Pfeffer 
( 93) pp. 101 & 117. P. venuslus , variations from type, with n. var. 
trispinosa, Azores ; Perrier (92) p. 287. 
P. oligoporus , Antilles, 274 metres ; Perrier (92) p. 293. P. perplexus , 
C. Blanc, N. of Banc dArguin, 2330 metres; op. cit ., p. 288 : n. spp. 
Pontaster ince, new subfam.; Yerrill (125) p. 246. 
Poraniidce , discussed, diagnosed, key to genera ; Perrier (92) p. 163. 
Porcellanaster , diagnosed, distribution of species ; Perrier (92) p. 210. 
P. granulosus , coast of Morocco, 2320-3200 metres ; Perrier (92) 
p. 216. P. inermis , Azores, 2995 metres ; op. cit., p. 212 : n. spp. 
Porcellariastcrida’, discussed, genera diagnosed, epiproctal appendage ; 
Perrier (92) p. 197. 
Prognaster, h. g;, with type P. longicauda , C. Yerde Is., Azores, &c ., 
1260 to 3526 metred ; PerrieR (92) p. 120, n. sp. 
Protasteracanthion , discussed ; Sturtz (115) pp. 54 & 75. 
Pseudar chaster intermedius ; Yerrill (125) p. 249. P. mosaicus, figured ; 
Alcock (2). 
P. concinnks , off George’s Bank and elsewhere, 123-1255 fms., variations ; 
Yerrill (125) P. U. S. Mus. xvii, p. 250, n. sp. 
Pseudaster, diagnosed, and P. cordifer, redescribed and figured ; Perrier 
( 92) p. 235. 
Psilaster andromeda , young with epiproctal appendage ; PerrieR (92) 
p. 195. P. florae ; Yerrill (125) p. 255. 
Pteraster, diagnosed, distribution of species; Perrier (92) p. 181. P. 
militaris , and P.pulvillus ; Pfeffer (93) pp. 104 & 119. 
P. alveolatus, Azores, 4060 metres ; Perrier (92) p. 183. P. ( Temnaster ) 
hexactis, Newfoundland Bank, 57 fms., with young ; Verrill (125) 
P. U. S. Mus. xvii, p. 275. P. sordidusj coast of Morocco, 1139 
metres ; PerrieR (92) p. 182 : n. spp. 
Pterasteridce, discussed, diagnosed, key to genera ; Perrier (92) p. 180. 
Eadiaster , diagnosed (p. 172), E. elegans , redescribed (p. 173) ; Perrier 
(92). 
