-62 Echin. 
XIV. ECHINODERMA. 
arti, L. spongiosa , and as var. L. jourdaini, descr. ; Perrier (254) 
p. 390, pi. xix. L. wyvillethomsoni ; Richard (271) pp. 66, 69. 
Ludwigia Reiffen 1901, nom. preocc. Pic, Coleopt., 1893 ; Cockerell 
(34). 
Meseres Ludw. [non Schewiakofl], diagnosis and list of spp. ; Perrier 
(254) p. 359. 
MesothuHa revised diagnosis (p. 301), table of spp. (p. 320), M. expectans 
R. Perrier 1899, between Azores and France, 4255 m. redescr. (p. 317) ; 
Perrier (254). M. intestinalis, descr., distrib. ; Perrier (254) p. 304, 
pi. xvi : distinguished fr. M. verrilli ; Ostergren (244) p. 6 : vide 
etiam sub Atlantis et llolothuria. M. lactea ; Richard (271) p. 67. 
M. marginata, refd. to Zygothuria (pp. 303, 322, 332), M. maroccana 
R. Perrier 1898, off Morocco, redescr. and first figd. (p. 312, pi. xvi), 
M. verrillii, descr., distrib. (p. 307, pi. xvi) ; Perrier (254). 
Molpadidae, diagnosis, comprises Molpadia, EupyrguSy Haplodactyla, 
Caudina, Trochostoma, and Ankyroderma ; Perrier (254) p. 524. 
Muelleria echinites ; Whitelegge (322) p. 13. 
Myriotrochidae n. fam., comprising Myriotroclius, Trochoderma, Acan- 
thotrochus ; Perrier (254) p. 292. 
Myriotrochus rinkii\ Michailovskij (223) pp. 471, 523: Mortensen 
(227) p. 89 : spicules descr. ; Norman (239) p. 415, pi. xxvii : redescr., 
incl. M. brevis, differences in wheels; Ostergren (244) p. 14. M. 
vitreus, redescr. and maintained ; op. cit. p. 18. 
Ocnus discussed and made s. g. of CucumaHa (q. v.) ; Perrier (254) 
p. 505. 
Oneirophanta , diagnosis, list of spp. (p. 373), 0. altemata R. Perr. 1900, 
betw. Azores and Europe, 4060-5005 m., redescr. with var. nov. 
talismani = “O. mutabilis ” E. Perrier, Explor. sous-mar. f. 201 
(p. 380, pis. xiv, xviii), O. mutabilis, distrib., variation, sclerites 
(p. 374, pi. xviii) ; Perrier (254). 
Orcula syn. of Phyllophorus ; Ostergren (244) p. 9. 0. (?) sp. ; 
Michailovskij (223) p. 521. 
PaelopatideSy vide Pelopatides. 
Paractinopoda ord. of Apoda , diagnosis ; Perrier (254) p. 538. 
Paroriza proahoi compared with Mesothuria expectans ; Perrier (254) 
p. 320. 
Pedata, rediagnosed as Sub-class ; Perrier (254) p. 299. 
Pelopatides, orthography corrected, list of spp. (p. 359), P. appendicidata , 
probably Benthothuria (pp. 360, 366), P. grisea R. Perr. 1898, redescr. 
(p. 361) ; Perrier (254). 
Peniagone revised diagnosis, comprises P. affinis, challengeri , vitrea , 
wyvillei, azonca, porcellus, vexillum , Elpidia purpurea , E. willemoesi , 
P. lugubris, atrox , intermedia, but P. discrepans and ecalcarea doubt- 
ful ; Perrier (254) p. 425. P. naresi, vide Periaimma. P. porcellus 
R. Perr. 1900, betw. Azores and France, 4060 m. (p. 426, pis. xii, xix), 
P. vexillum R. Perr. 1900, loc. unknown (p. 429, pis. xiii, xix), both 
descr. and first figd. ; Perrier (254). 
Periamma, diagnosis, comprises P. insigne , robustum , naresi, roseum, 
furcatum (p. 417), P. roseum [E. Perr. 1886, sub Peniagone , and not 
n. sp. as here stated], descr. (p. 419, pis. xiii, xx) ; Perrier (254). 
Phyllophorus cebuensis (Semper, sub Thyonidium), with n. var. theeli 
based on Challenger specimen ; Pearson (250) pp. 194, 205, pi. ii. 
P. drummondi, relation to P. pellucidus ; Ostergren (244) p. 9 : 
perh. incl. Thyonidium dubeni Norm, and Thyone portlocki Forbes ; 
Nichols (236) p. 244 : descr., perhaps incl. Orcula luminosa Lamp. ; 
Michailovskij ^223) pp. 467, 521. P. pellucidus ; Lonnberg (197) 
p. 25: Nichols (236) p. 244: Norman (239) p. 411: Ostergren 
(244) p. 8 : growth of spicules ; Michailovskij (223) pp. 466, 521. 
