654 Brtt— On the Echinoderm Fauna of the Island of Ceylon. 
50. HoLoTHURIA ATRA. 
Holothuria atra. Jaeger, De Holothur., p. 22; Semper, Holothur., p. 88 ; 
Lampert, p. 85; Théel, pp. 181 and 213. 
This is one of the most widely distributed of Echinoderms. 
51. Honorauria cmsarea (PI. xxxix., fig. 2). 
Holothuria cesarea. Ludwig, Arbeit. Zool. Institut, Wirzburg, u., p. 87 ; 
Lampert, p. 61; Théel, p. 227. 
This must be a particularly fine form when alive. Dr. Théel thinks that this 
species is synonymous with Holothuria discrepans and H. immobilis of Semper. So 
far as any argument can be drawn from geographical distribution, the presence of 
H, cesarea at Ceylon would support the views of that distinguished naturalist ; 
for, while H. discrepans and H. cesarea have only been reported from the Navi- 
gator’s Islands, H. immobilis (under the title of H. collaris, Haacke) has been found 
at Mauritius, 
52. HoLorauria CINERASCENS (Pl. xu., fig. 2). 
Stichopus cinerascens. Brandt, Prodr. descr. Animal., p. 51. 
Holothuria pulchella, Selenka, Zeitschr. f. wiss. Zool., xvii., p. 329 ; Semper, 
Holothur., p. 89; Théel, p. 212. 
Holothuria cinerascens. Lampert, p. 82. 
Dr. Lampert appears to be right in restoring Brandt’s specific name for this 
species; Dr. Théel recognises the synomyms of H. pulchella with H. cinerascens, 
but retains the more frequently used specific name. 
53. HoLoTuHuria IMPATIENS. 
Fistularia impatiens. Forskal, Descr. Animal., p. 121. 
Holothuria impatiens. Gmelin, Syst. Nat., p. 3142, pl. xxxix., fig. B ; Semper, 
pp. 82 and 248, pl. xxu.; Lampert, p. 65; Théel, p. 233. 
It would have been astonishing, indeed, if this well-known and widely distri- 
buted form had not been found on the shores of Ceylon, 
54, HoLoTHURIA ONDAATIEI, n. sp. (Pl. xxxix., fig. 3). 
No calcareous spicules in bodywall. 
Twenty tentacles; body elongated; suckers confined to trivium, where they 
are irregularly and rather thickly distributed; integument soft, rather thick; 
cesophageal ring delicate; Polian vesicle not long; no Cuvierian organs; genital 
tubes elongated, extending far back. 
Colour—chocolate brown bivium, rather lighter on the trivium and tentacles. 
The larger specimen is 100 mm. long, and its greatest diameter is 18 mm. 
