472 ON GEPHTEEAN -WORMS FEOM ROTTJMA ETC. [June 7, 



Nevertheless there was no trace of calcareous deposit on the shield 

 at the base of the introvert, around the spirally arranged papillsB 

 of this part of the body. 



13. Thalassema catjdex Lampert. (Plate XXXVII. fig. 11.) 



Two specimens from Eotuma ; also recorded from the Indian 

 Ocean and the Red Sea. 



Lampert ' gives no details of the size of this species, except that 

 it is very different in different specimens. The smaller of my two 

 specimens measured just under 5 cm. from the mouth to the 

 posterior end, and the length of the proboscis was 1-8. The 

 corresponding measurements in the larger specimen were 7 cm. 

 and 2-5. The last mentioned auimal was very rotten and little 

 could be made out of its internal anatomy ; the six brown tubes 

 were enormously distended and occupied a large portion of the 

 body-cavity ; presumably they were £uU of generative cells, but 

 the "animal was too decayed to determine this. In the other specimen 

 the three pairs of brown tubes were normal, the anterior seemed to 

 me to open between or just behind the pair of hooks, but this point 

 could only be satisfactorily determined by sections. 



The large specimen, in spirit, was a dirty brown ; the small was 

 olive-green in colour. The longitudinal bundles of muscles were 

 clearly visible externally (fig. 11). 



Lampert gives no figure, so I have added one. 



This species was found under the growing coral near the outer 

 edge of the reef. 



*o^ 



14. Thalassema tegbande Lampert. (Plate XXXVII. fig. 12.) 



One specimen from Eotuma, also found in the Philippines. 



Like Lampert I had only a single specimen, and, like his, mine 

 bad no proboscis. There was no trace of one and no scar to 

 indicate that there ever had been one, and I am inclined to 

 think that this species may be without a proboscis (fig. 12). _ The 

 mouth is terminal and central, and but for the hooks there is no 

 external indication as to which is the anterior end. The skin 

 is thin and papery and so transparent as to allow the white and 

 red fragments of coral in the intestine to shine through. No signs 

 of longitudinal or circular muscles can be detected even with a 

 lens. Numerous pigmented papillae are scattered over the skin, 

 and thev become concentrated at the anterior end of the somewhat 

 lemon-shaped body. The length of the body is 3-5 cm., the greatest 

 breadth 1-4 era. 



Unfortunately the preserving fluids had not penetrated the body 

 and the interior was in a sad state, and only traces of the brown 

 tubes could be seen. Lamport says there are three pairs. The 

 long brown anal tubes were left, but the alimentary canal had. 

 broken up in many parts, and the body-cavity was full of pieces of 



1 ZeitBchr. wiss. Zool. Bd. xxxix. 1883, p. 334. 



