71 



In a specimen of 16 mm. diameter there are as yet only the two primary 

 series of tubercles in both areas, the secondary tubercles all being quite small. 

 The miliary tubercles at the distal side of the primary tubercles are elongated, thus 

 looking as if they radiate from the primary tubercle. No genital openings have yet 

 been formed; in a specimen of 18 mm. diameter they have appeared. Otherwise 

 I have nothing to add to the description of the test given by Döderi.ein; only the 

 pedicellariæ, spicules and the buccal membrane need to be mentioned. 



The globiferous pedicellariæ (described and figured by de Meijere) are of 

 one kind only, with 1 — 1 lateral teeth. The outer corners are produced, but not 

 always so sharply as in the figured one (PI. VI. Fig. 11). The tridentate pedicellariæ 

 (PI. VI. Fig. 1, 41) are rather small, ca. 1 mm. (head). The valves are very wide 

 apart, joining only at the point; the blade is long, narrow, deep in the lower part, 

 a little widened in the outer part. The edge is quite smooth or finely serrate 

 below, coarsely sinuate at the point, where the valves join ; this part of the edge is 

 at an obtuse angle with the rest of it. There may be rather much meshwork in 

 the blade. The ophicephalous and triphyllous pedicellariæ do not present obvious 

 characters; the former are like those of bicolor or a little more elongate, the latter 

 have the blade a little widened. — The spicules of the tube feet are mostly very 

 scarce, except just below the sucking disk, where they may be found in great 

 numbers. 



The buccal membrane has, as usual, numerous small plates round the 

 mouth, inside the buccal plates; outside these some spread plates may be found 

 besides the usual thick plates, covered with pedicellariæ, placed opposite the gills. 

 Numerous small bihamate spicules are found in the buccal membrane. The buccal 

 plates may be covered with small tridentate or triphyllous pedicellariæ. — The walls 

 of the intestine are provided with rather few small bihamate spicules; in the stone 

 canal and ovoid gland they are more numerous and may be a little irregular. The 

 genital organs are treeshaped ; the stem and the main branches have the walls studded 

 with very curious calcareous bodies, namely bihamate spicules, which have become 

 closed to a ring and with a more or less complicate network on the outside of the 

 ring. All transitional forms between the typical bihamate and the most compli- 

 cated form are found (PI. V. Fig. 23). In the finer branches of the genital organs 

 only bihamate spicules are found, often in great numbers together on small spots, 

 the rest of the branch being almost destitute of spicules; they are distinctly smaller 

 than those in the stem. — Ripe eggs are found in specimens taken in February in 

 the Gulf of Siam and in August in the Johore-Strait (Singapore). 



A rich material of this species, small and large specimens, was taken at 

 Koh Kram, 20-30 fathoms, Koh Mesan, 10-15 faths. and Koh Kahdat, 4—5 faths. 

 Further a number of large specimens were taken by Marius Jensen in Johore-Strait 

 (Singapore) in August 1901. One of the latter specimens has the spines on the 

 abactinal side almost quite white. 



