HOLOTHURIOIDEA. (iV, B.) 
Echin. 69 
S. ayresi Sel., syn. of S. inhaerens ; Clark (65) p. 485. S. bus/ci; 
Todd (302) p. 365: no pelagic larva; Mortensen (214) p. 6. S. 
digitcita; Todd (302) p. 365: Auricularia; Mortensen (214) p. 6 & 
fig. S. girardii Pourt., and S. gracilis Sel., synn. of >S. inhaerens ; 
Clark (65) p. 486. S', inhaerens ; Todd (302) p. 365: Fauvel (108) 
p. 81 : Clark (64) p. 345, & (65) p. 489: popular account; Newbigin 
(221) p. 145: no pelagic larva; Mortensen (214) p. 6: evidence of 
former circumpolarity ; Clark (62) p. 164. S. lappa ; Clark (66) 
p. 259. S. ooplax ; Sluiter (284) p. 124. S. pellucida Stmps. & 
Kurtz, syn. of S. inhaerens (p. 485), S. pourtalesii Sel., syn. of >S f . 
vivipara (p. 485), S. roseola (p. 489); Clark (65), & habitat; (64) 
p. 341. S. tenuis Ayres, syn. of S. inhaerens ; Clark (65) p. 486. A. 
viridis Pourt. { — S. pourtalesi Sel.) is syn. of S. vivipara ; loc. cit. & 
Clark (64) p. 341. S. vivipara ; Clark (65) p. 489: protective green, 
incl. S. pourtalesi Sel.; Clark (64) p. 341. 
Synaptula Oerst., syn. of Synapta; Clark (65) p. 485. 
Thyone briareus (p. 494), T. Carolina Sel., syn. of T. briareus (p. 485); 
Clark (65). T. castanea , colour and spicules; Sluiter (284) p. 93. 
T. cigaro Trosch., syn. of T. briareus-, Clark (65) p. 485. T. discolor 
n. sp., Indian Archipelago, 13-91 metres; Sluiter (284) p. 96. T. 
elongata-, Clark (65) p. 494. T.fusus-, Todd (302) p. 366. T. fuszis 
Merrill, syn. of T. scabra (p. 486), T. gemmata (p. 494); Clark (65). 
T. mirabilis , no spicules (p. 93, pi. i), T. pituitosa n. sp., Indian 
Archipelago, 310 metres, outwardly resembling Mesothuria (p. 94, 
pi. vi); Sluiter (284). T. raphanus-, Todd (302) p. 366. T. rubra 
n. sp., Monterey B., California, viviparous, young descr.; Clark (62) 
p. 166 & text-figg., & (65) p. 494. T. sacellus; Sluiter (284) p. 93. 
T. scabra ; Clark (65) p. 494: Whiteaves (320) p. 46. T. spadix 
n. sp., Indian Archipelago, under 40 metres; Sluiter (284) p. 97, 
pi. vi. T. tenella Sel., syn. of T. briareus (p. 486), T. unisemita 
(p. 494); Clark (65). T. vitrea n. sp., Indian Archipelago, 310 
metres, no spicules but forms sheath of Globigerina tests, as in 
Meseres; Sluiter (284) p. 95, pi. vi. 
Thyonella Verrill, syn. of Thyone ; Clark (65) p. 485. 
Thyonepsolus n. g. with genotj T pe T. nutriens n. sp., Monterey B., 
California, young in skin of back; Clark (62) p. 169 & text-figg., & 
(65) p. 491: referable to Psolidium ; Ludwig in Abstract. 
Thyonidium glabrum Ayres, syn. of Thyone briareus (p. 486), T. nius- 
culosum Ayres, syn. of Thyone elongata (p. 485); Clark (65). T. 
pellucidum-, Whiteaves (320) p. 46. T. production; loc. cit.: Clark 
( 65) p. 494. 
Trochinus Ayres, syn. of Chiridota ; T. pallidus Ayres, syn. of C. laevis: 
Clark (65) p. 485. 
Trochoderma elegans-, Ostergren (231). 
Trochostoma antarcticum , descr.; Herouard (150) p. xlvi. T. arenicola ; 
Clark (65) p. 490. T. boreale ; Ostergren (231) : Knipovitsch 
( 171): probably incl. Molpadia turgida Merrill; Clark (65) p. 490. 
T. granulatum-, Sluiter (284) p. 118. T. ooliticum-, Whiteaves (320) 
p. 47: possibly = T. boreale-, Clark (65) p. 490. T. scabrum n. sp., 
with n. var. spuiosa, Indian Archipelago, 310-918 metres; Sluiter 
( 284) p. 119, pi. x. T. turgidum ; Whiteaves (320) p. 46. 
Ypsilothuria , v. Sphaerotkuria. 
Zygothuria Perrier, not accepted; Sluiter (284) p. 25, vide Mesothuria 
lactea . 
