OPHIUROIDEA. (IV, E.) 
Echin. 91 
Ophiomusium, defined, list of spp.; op. cit. p. 924: mouth-parts ; Zur 
Strassen (338). 0. eburneum elegans (p. 243), 0. sculptum (p. 244), 
0. validum , slight differences from type, approach 0. lymani (p. 244); 
Clark (66). 
Ophiomyces , defined, list of spp.; Meissner in Hamann (146) p. 933. 
Ophiomyxa , defined, incl. Ophiodera Yerrill, list of spp. ; op. cit. p. 947. 
0. Jiaccida ; Clark (66) p. 251 : numbers, measured, colour ; Clark 
( 64) p. 340. 
Ophiomyxidae , defined ; Meissner in Hamann (146) p. 946. 
Opkioncus , defined ; op. cit. p. 916. 
Ophionema , defined ; op. cit. p. 938. 
Ophionephthys , defined, list of spp.; op. cit. p. 938. 
Opliionereis, defined, incl. Ophiotriton Doed., list of spp.; op. cit. p. 933. 
0. dubia first recorded from W. Indies (p. 248), 0. olivacea n. sp., 
Porto Rico (p. 248, pi. xiv); Clark (66). 0. reticulata ; Clark (64) 
p. 340, & (66) p. 249. 
Ophiopaepale , defined ; Meissner in Hamann (146) p. 919. 
Ophiopeza , defined, list of spp.; op. cit. p. 917. 
Ophiopezella , defined ; op. cit. p. 917. 
Ophiopholis ( Ophiolepis ), defined, list of spp.; op. cit. p. 927. 0. acideata ; 
Knipovitsch (171) : Koehler (173) p. 101 : Rankin (252) p. 178 : 
Todd (302) p. 365 : Whiteaves (320) p. 60 : + Smith et al. (287) 
p. 533 : popular account ; Newbigin (221) p. 132 : Pluteus ; Mor- 
tensen (214) p. 18 & fig. 0. caryi , colour ; Clark (63) p. 330. 
Ophiophragmus , defined, list of spp.; Meissner in Hamann (146) p. 931. 
Ophiophyllum , defined ; op. cit. p. 922. 
Ophiopinax , defined ; op. cit. p. 917. 
Ophioplax , defined ; op. cit. p. 932. 
Ophiopleura , defined; op. cit. p. 923. 0. borealis ; Knipovitsch (171): 
650-1185 metres, 4 cm. diam., incl. 0. arctica ; Koehler (173) p. 101. 
Ophioplinthaca spinissima [sic] n. sp., Porto Rico, 97-120 fms., but 
differs from normal Ophioplinthaca in absence of special marginal 
scales; Clark (66) p. 250, pi. xv. 
Ophioplinthus , defined ; Meissner in Hamann (146) p. 921 : mouth- 
parts ; Zur Strassen (338). 
Ophioplocus, defined, list of spp.; Meissner in Hamann (146) p. 920. 
Ophiopluteus in general, list of spp. (p. 13), 0. claparedei (p. 20 & fig.), 
0. compressus (p. 16 & fig.), 0. coronatus (p. 17 & fig.), 0. dubius (p. 16 
& fig.), 0. mancus “ n. sp.”, 10. Amphiurae Jiliformis (p. 20 & fig.), 
0. Ophioglyphae albidae (p. 15 & fig.), 0. Ophioglyphae texturatae 
(p. 15 & fig.), 0. Ophiopholis aculeatae (p. 18 & fig.), 0. Oyhiothricis 
fragilis (pp. 14, 18 & fig.), 0. ramosus (p. 19 & fig.); Mortensen 
(214). 
Ophiopristis hirsuta ; Clark (66) p. 250. 
Ophiopsammium , defined ; Meissner in Hamann (146) p. 944. 
Ophiopsila, defined, incl. Amphipsila Yerrill, list of spp.; op. cit. p. 932. 
0. fulva , slight differences from type, is not allied to Amphipsila 
maculata Yerrill (p. 245), 0. riisei (p. 246); Clark (66). 
Ophiopteris , defined ; Meissner in Hamann (146) p. 940. 
Ophiopteron , defined ; op. cit. p. 941. 
Ophiopus , defined, incl. Ophiaregma Sars ; op. cit. p. 928. 
Ophiopyren , defined, list of spp.; op. cit. p. 918. 0. regulare Koehl. 1900, 
Antarctic, descr.; Koehler (72) p. 26, pi. viii. 
Ophiopyrgus, defined ; Meissner in Hamann (146) p. 923. 0. australis 
Koehl. 1900, Antarctic, descr., a very young specimen of 2 mm. diam. 
is alone known ; Koehler (172) p. 24, pi. vii. 
Ophiosciasma , defined ; Meissner in Hamann (146) p. 937. 
Ophioscolex , defined, list of spp.; op. cit. p. 937. 0. sp.; Knipovitsch 
1901. [Vol. xxxvni.] e 26 
