848 ON HOLOTHURIANS FROM PUNAFUTI AND UOTUMA. [NoV. 15, 



Stnapta ooPiAX Marenzeller. 



Si/napta ooplax v. Mar. Verb, zool.-bot. Ges. Wien, xxxi. 1881, 

 pp. 122, 123, Taf. iv. fig. 1. 



Beference. H. Ostergren, Zool. Anz. Bd. xxi. 1898, pp. 233-237. 



Distribution. Eecorded from Japan aud Loyalty Is. 



Three specimens from beach of lagoon, Funafuti; largest 

 135 mm. X 5 mm. 



The body is nearly circular in section, with the radii visible as 5 

 white indistinct longitudinal bands ; colour whitish, without the 

 pink tinge which typically characterizes the species. 



In one specimen the deposits were quite typical, in the second 

 they were completely dissolved, and in the third somewhat 

 disintegrated, anchors alone vA^ere present (no anchor-plates or 

 biscuit-shaped spicules) ; I believe this condition to be due to 

 partial artificial solution, but as Sluiter has described for Synapta 

 Icefersteini a somewhat similar condition of partial decalcification, 

 which he believes to be natural, it seemed worth while to mention 

 the fact : Ostergren has also laid stress on a similar process taking 

 place in other Holothurians. 



EXPLANATION OF THE PLATES. 

 Plate LII. 



Fig. 1. Actinopyga parvula Selenka, p. 836. 



a. Entire ventral view. X 4. 



b. Tabular deposits. X 250. 



c. Button-like deposits and sieve-plates. X 250. 



d. Spiny rods in the dorsal feet. 



Fig. 2. Holothuria ftiscocincrea, var. pervicax Selenka, p. 837. 



a. Entire side view. X 1^. 



b. Deposits (excluding tables). X 250. 



Fig. 3. Holothuria difficilis Senlper, p. 838. Entire side view. Nat. size. 



Plate LIII. 



Fig. 4. Holothuria ruyosa Lvidwig, p. 839. Entire side view. Nat. size. 

 Fig. 5. Fseudocucumis africana Semper, p. 843. Entire side view. X 3. 

 Fig. 6. Chiridoia intermedia, sp. nov., p. 846. 



a. Wheel from below. X 850. — The teeth on the upper edge are seen 



through the rim and the centre of the basal plate is shown in 

 focus, bp., basal plate ; cp., cover-plate ; cpc, centre of cover- 

 plate ; cpr., radius of cover-plate ; lie., upper edge of wheel 

 (toothed) ; le., lower edge of wheel (smooth) ; bjjr., radius of basal 

 plate; sp., spoke of wheel between point of junction of cpr. and 

 bpr. and rim of wheel; 1-6 opposite ends of spokes seen on rim 

 of wheel. 



b. Wheel on edge, same lett«ring as a. X 850. The basal plate {hp.) is 



seen dimly through the cover-plate (cp.) in the centre. 



c. Rods in body-wall, x 300. 



d. Rods in tentacles. X 300. 



