160 



Radiais and interradiais distinctly different, ca. 9 holes in posterior 

 end of anchor-plates lamperti 



23. Cartilaginous ring very faint and translucent (Fig. 27. 10)... estergreni 

 Cartilaginous ring well developed around the calcareous ring, not 

 translucent in its anterior half 24 



24. Colour reddish-grey, mottled with brown spots and bands (Pl. II fig. 

 6 — 7). Calcareous ring faint with more or less incomplete anterior 



margin (Fig. 24. 12) maculata 



Colour more or less dark purple, not mottled, but either finely striped 



or reticulated 25 



25. Body reticulated, tentacles purple. Three small holes in posterior end 



of anchor-plate. Miliary granules irregularly shaped (Fig. 25. 4) reticulata 

 Body finely striped, tentacles yellow. 5 — 7 small holes in posterior end of 

 anchor-plates. Miliary granules very regularly shaped (Fig. 25. 11) purpurea 



26. Colour violet minima 



Colour white 27 



27. Muscular impressions on calcareous ring distinct (Fig. 26. 3).. bandae 

 Muscular impressions on calcareous ring wanting (Fig. 26. 12) . laclea 



Synaptula reciprocans (Forskâl). 



Synaptula nigra (partim). Clark. 1908. The Apodous Holothurians. pag. 

 81—82. 



Synaptula reciprocans. Th. Mortensen. 1926. Trans. Zool. Soc. Parti 

 pag. 117. 



Port Tawfiq. 1924. Dr. M. Fox. 3 specimens. 



The specimens at hand measure 12, 10 & 6 cm in length. Their 

 colour is dark brown and the tentacles are a little darker than the 

 body. They have 15 tentacles, which are in the largest specimen 

 ca. 1 cm long. On the distal two thirds there are ca. 15 pairs of 

 digits. The digits are so much contracted that the absence or pre- 

 sence of a web cannot be stated with certainty. Eye-spots are not 

 visible on the oral disk, and the eyes are rudimentary. The cartilag- 

 inous ring is well developed and encloses the weak calcareous ring. 

 On the exterior side of the calcareous ring there are distinct musc- 

 ular impressions, and the radiais are perforated for the nerves 

 (Fig. 15. 7). There are several polian vesicles and a single stone- 

 canal. The short and voluminous gonads consist of a thick main 

 branch and many short side-branches. The oesophagus is distinct 

 from the intestine which has a large loop. On the mesenteries there 

 are ciliated funnels, which are placed into small groups (Fig. 15. 9) 

 with 2 — 5 funnels in each. In the groups the funnels are situated 



