66 



t. [KEDA : 



The alimentary canal of the males are found in the same dege- 

 nerated condition as in Bonellia miyajimai and B. misakiensis 1 , that is 

 to say, it is cut up into small pieces, of which there are ten to be seen 

 in Fig. 8 (<?/). They float in the coelom and may take any position as 

 the animal moves. 



Other coelomic contents are the floating sperm cell-masses {spin). 

 Some of them consist of quite young cells, while others are in the last 

 stages of spermatogenesis. 



The ventral nerve-cord (vnc) can be fairly distinctly made out in the 

 stained preparation. No ring-nerve is found around the spermduct. 

 Neither blood vessels nor any trace of segmental organs are present. 



So far as the general external feature (as, f. i., the general shape 

 and relative size of the proboscis- and the texture of the smooth 

 and tranlucent integument devoid of any sort of hook-like structures) 

 of the female specimen is concerned, the present species is in 

 agreement with both the Arctic and the East Indian forms. There 

 are however remarkable differences between the two known species 

 and the present; i.e., (1) the yellowish red integument, the known 

 forms being said to be " durchscheinend grün " (Hamingia sibogaé) 

 or " hell grasgrün " (H. aclica) ; (2) the absence of the papillary 

 appendices on the proboscis-tip (H. sibogae) or around the genital 

 openings (H. arcticd). The internal anatomy of the female of the 

 present species agrees in the main with that of Hamingia arctica, 

 but little with that of//, sibogae. It must here be noted that Sluiter's 

 description of the internal anatomy is not full, since in his single 

 specimen some parts of the viscera seem to have been greatly torn ; 

 he could not detect any trace of the gonad, the anal glands, and 

 the collateral intestine. Neither is a description of blood-vessels 



1. Ikeda, I., — The Gephyrea of Japan : Journ. Coll. Sci., Imp. Univ. Tokyo, Japan, 

 Vol. XX, Art. 4, 1904. 



2. The original description of Danielsen and Koren that Hamingia antica is devoid 

 of a distinct proboscis, was later corrected by Lankester, who observed a w ell developed pro- 

 boscis nearly equal in length to the body proper. 



