HOLOTHURIANS. 143 



References: C. Semper. Reisen Philipp. Hoi. 1868, pp. 11, 12, Taf. iv. figs. 6, 7, 8. 



S. grisea and S. glabra. 

 C. Ph. Sluiter. Semon's Forsch. in Austr. u. Mai. Arch. Bd. 5, Lf. 1. 



£. serpentina and S. glabra. 

 Loc. Off China Straits, New Guinea. 



Only the anterior end of one specimen, the colour of which when alive was mottled 

 yellow and black, giving an irregularly reticulate pattern. Length about 50 cm. Fifteen 

 tentacles with numerous (about 30) pinnae, two black spots at inner base of each tentacle; 

 anchors, anchor-plates, and miliary granules like those of S. glabra and S. grisea 

 figured by Semper and those of S. raynaldi figured by Held; they are '29 mm. and 

 "26mm. in length respectively. Cartilaginous ring present; calcareous ring with short 

 ascending processes; Polian vesicles numerous; gonads equal, a pair of wide tubes 

 with numerous diverticula. There is some doubt as to how far this species is distinct 

 from S. serpentina. The calcareous deposits of the specimen examined resemble what 

 has been described for the latter, but there is said to be no cartilaginous ring in 

 S. serpentina. 



6. Ckirodota rufescens Brandt. 



Chirodota variabilis Semper. C. Semper. Reisen Philipp. Hoi. 1868, pp. 20, 21. 

 Taf. v. figs. 6, 7, 9—11, 19, &c. 



Reference: H. Ludwig. Z. f. w. Z. 35, 1881, pp. 578, 579. 

 Loc. Loyalty Islands. 



One specimen 9'7 cm. long, colour uniform reddish in spirit. 



Seventeen tentacles; wheels of different sizes, all toothed; curved rods in body-wall 

 confined to ambulacra ; shorter rods occur in the radial longitudinal muscles ; anatomy 

 agrees with Ludwig's description of Brandt's original example. 



Loc. Blanche Bay, New Britain. 



Another specimen 6 cm. long x 1 cm. broad, differs from the preceding in the 

 absence of the red colour, in the transparency of the skin, and in the distribution 

 of the curved rods over the interambulacra as well as the ambulacra ; 17 tentacles, 

 the pinnae of which appear to be retractile into a sheath at the base (cf. Mertens). 



7. Chirodota rigida Semper. 



C. Semper. Reisen Philipp. Hoi. pp. 18, 19, Taf. iii. fig. 3, Taf. v. 

 figs. 3, 13, &c. 



Reference: H. Ludwig. Zool. Jahrb. Systematik, III. 1888, p. 819. C. amboinensis. 



Loc. Off China Straits, New Guinea. 



A number of fragments including only one head ; colour reddish-purple in spirit, 

 with the wheel-papillae standing out as conspicuous white tubercles. 



Tentacles, calcareous ring, deposits of body-wall, and colour correspond to Semper's 

 description, but the pieces were too fragmentary to determine any further anatomical 

 details ; no C-shaped deposits, wheels up to "1 mm. in diameter, rods up to '07 mm. in 

 length. 



