1 16 



have 15 tentacles, each with ca. 25 pairs of digits, which are not 

 united by a membrane. On the oral side of the tentacle-base there 

 is an eye-spot. The calcareous ring is weak and enclosed in the 

 cartilaginous ring. The polian vesicles are numerous and the ma- 

 dreporic canal is bushy-branched. The anterior end of the intestine 

 is as in maculata thick and glandular and the ciliated funnels are 

 as in that species small and placed on the mesenteries. 



Although the large specimen is so much bigger than the 

 other Synaptas present, the calcareous deposits are smaller here 

 than in the other forms. The anchors (Fig. 3. 2) measure ca. 

 750 ft in length by ca. 600 jtv in width and the width-index is ca. 

 80. The stock is not branched, but spiny, the arms are smooth 

 and on the vertex there are minute knobs. The anchor-plates 

 (Fig. 3. 9-11) are oval or rectangular and not wider in the arti- 

 cular than in the anterior end. They measure ca. 600 ii in 

 length by ca. 325 in width. The central holes are large and there 

 are usually few small ones in the ends, but in some few plates 

 there may be, as seen from the figure (Fig. 3. 11) some more 

 holes in the fore-end. The miliary granules are rosettes, quite 

 alike those in maculata, and rods are wanting in both the oral 

 disk and in the tentacles. 



This form is closely related to maculata, but it differs so distinctly 

 from it in the shape of the anchor-plates and in the width-index 

 of the anchors, that it cannot simply be referred to the said species. 

 Whether it must be regarded as a variety of maculata or as a separate 

 species it is not possible to say, as our knowledge of the range of 

 variations of the calcareous deposits in this genus is very insufficient. 



Synapta maculata var. sundaensis n. var. 



Sebesi (Sunda Strait). I. VIII. 1922. The shore at low water mark. 

 1 specimen. 



The colour of the single specimen at hand is very near that of 

 maculata, except that it is a little more mottled. It has 15 ten- 

 tacles, each with but 20 pairs of digits, which are not united by 

 a membrane. On the oral side of the tentacle-base there are pig- 

 ment-spots and the internal anatomy is quite as in maculata. 



The anchors (Fig. 3. 3) measure ca. 950 jn in length by ca. 

 700 ^ in width and the width-index is ca. 73. The stock of 



