ECHINOIDEA. (iV, C.) 
Ecliin. 65 
fOpissaster thebensis ; Fourtau (96) p. 676. 
t Orthopsis: — 0. miliaris ; Fourtau (98) p. 194. 0. rupellii de Lor., 
believed to be Cretaceous of Sinai, probably Cenomanian, and not 
Nummulitic of Mokattam ; Fourtau (96) p. 619. 
f Palaeodiscus ferox , jaws and ambulacra described and figd.: Sollas (216) 
p. 701. 
t Palaeostoma zitteli ; Fourtau (96) p. 665. 
iParopsonema , nom. nud.; Clarke (60). 
t Pedina sinaica Desor, doubtful if from Cretaceous of Sinai; Fourtau 
( 96) p. 619. 
Periaster , vide etiam sub Hemiaster. t P. elatus ; Fourtau (96) p. 631. 
t Pericosmus : — P. aequalis ; Airaghi (4) p. 173. P. lyonsi, n. sp., “ Hel- 
vetien n, Couches a Pecten Malvinae.” Gebel Geneffe, G. Aouebet, 
G. Darnasq, Egypt; Gauthier in Fourtau (96) p. 716, pi. iv. P. 
marianii T n. n.; Airaghi (3) p. 251 : n. sp., Aquitanian of R. Rava- 
nasco in Bormida basin ; Airaghi (4) Boll. Soc. geol. Ital. xviii, p. 175, 
pi. vii. P. paronai, n. n.; Airaghi (3) p. 250 : n. sp., Tongrian of 
Cassinelle in Bormida basin, based on P. edwardsi var. minor Botto- 
Micca ; Airaghi (4) Boll. Soc. geol. Ital. xviii, p. 174, pi. vi. P. 
pasqualii , n. sp., Lutetian ii, Mokattam, allied to P. spatangoides , 
type in Pasquali coll. ; Gauthier in Fourtau (96) p. 672, pi. ii. 
P. peroni , measurements (p. 174); P. spatangoides (p. 173, pi. vii) : 
Airaghi (4). 
Phormosoma hoplacantha , evidence for bipolarity; Thompson (230) 
p. 319. 
Phyllacanthus annulifera , Zoanthid incrusting spines (p. 134); P. gigantea , 
(p. 135); P. imperialis (p. 135): Bell (32). v 
Phymosoma d’Arch. & Haime non Quatrefrages. t P. radiatum ; Zelizko 
( 260) pp. 534, 541. 
t Plagiopygus, vide sub Gisopygus. 
Plesianthus , vide Glypeaster taramellii. 
t Plesiaster :— P. bucardium Goldf. (sub Spatangus ), redescr. fr. holotype 
and topotypes (p. 119, pi. ix); PP. parvistella , n. sp., “ Hornstein des 
Aackener Waldes,” separated from P. bucardium (p. 121, pi. ix): 
SCHLUETER (209). 
t PIesiospatangus Pomel, accepted as genus and redefined; Gauthier in 
Fourtau (96) p. 678 ; Lambert in Review suggests union with 
Brissospatangus Cott. 1863. P. cotteaui ; Fourtau (96) p. 687: 
apical system ; Gauthier (102) p. 344, text-fig. 1. 
t Pliolampas , descended from Echinanthus and are Miocene; Gauthier in 
Fourtau (96) p. 653. P. pioti , n. sp., “Helvetien ii, couches au- 
dessous du niveau des Heterostegina ” Gebel Geneffe and Gebel 
Aouebet, Egypt; Gauthier in Fourtau (96) p. 712, pi. iii. 
t Porocidaris schmideli ; Fourtau (98) p. 197 : Egyptian localities, those of 
Mayer-Eymar corrected ; Fourtau (96) p. 638. 
Pourtalesia p/iiale, evidence for bipolarity; Thompson (230) p. 318. 
t Prenaster (1) carinatus, n. sp., Senonian, Daghestan; Anthula (18) 
p. 65, pi. ii. 
t Protocidaris, n. g. of Archaeocidaridce , compared with Arckaeocidaris , 
Eocidaris , and Lepidocidaris (p. 202): with genotype P. acuaria Whidb. 
(sub Eocidaris ?), Pilton beds, E. of Barnstaple, type in Mus. Pract. 
Geol., compared with Cidaris laevispina Sandberger (p. 203, pi. xxv); 
Whihborne (250). P. sp. [Ludlow beds ?], Leintwardine, possibly 
this genus is a large Echinocystis ; Sollas (216) p. 709. 
f Psammechinus : — P. ajfinis var. depressa (p. 693); P. dubius , cited by 
Rothpletz from Ouady Etal, Sinai, where however no Miocene exists 
(p. 694) ; P. monilis, apparently an Arbacina (p. 694) : Fourtau (96). 
P. woodsi ; Hall & Pritchard (117) p. 48. 
