Gr. Y. and A. F. Dixon — On Bunodes thallia, etc. 321 



which nowhere reaches the oesophagus. The edges of the me- 

 senteries are thickened so as to form a trifid band, and to exhibit 

 in transverse section the appearance of a trifoliate leaf, the middle 

 lobe of which alone contains the unicellular glands (PI. v. fig. 5). 

 The free margins of the mesenteries are arched upwards, so 

 that a transverse section near the lower end of the oesophagus cuts 

 a mesentery reaching it in two places, each fragment having a trifid 

 end hanging free, and one being attached to the oesophagus and 

 one to the body wall. The directive mesenteries, however, are not 

 arched, but run with straight margins from the end of the oeso- 

 phagus to the base. 



The warts are seen to be in the endocceles, and are more 

 numerous above than in the region of the base. 



Occasionally the tentacles of Tealia crassicomis are somewhat 

 contracted, and exhibit the fluted appearance described in Bunodes 

 thallia ; but this phenomenon is not of very frequent occurrence. 

 A transverse section of a tentacle in this condition presents an 

 appearance somewhat resembling that of a tentacle of Bunodes 

 thallia, and still more that of a tentacle of Di/sactis crassicomis as 

 figured by Professor Hertwig, the muscle being mesodermal. 

 (" Challenger " Eeport, Supplement, PL n., figs. 6 and 7.) 



Bunodes verrucosa. 



We have carefully examined twenty -three adult specimens of 

 Bunodes verrucosa ; all of these except one had the arrangement 

 of tentacles described by Grosse, viz., 6, 6, 12, 24. The one 

 exception had forty-six tentacles ; in this specimen there were 

 only five tentacles in the inmost row, but the radius and white 

 mark at the spot where the sixth tentacle should have been deve- 

 loped were quite conspicuous, and there were only twenty-three 

 tentacles in the outer row. Furthermore, all of these specimens 

 had the arrangement of warts described by Grosse, that is, six 

 primary rows corresponding to the six inmost tentacles ; and six 

 secondary rows corresponding to the secondary row of tentacles ; 

 twelve tertiary rows corresponding to the tertiary row of tentacles, 

 and finally twenty-four small rows placed one between each of the 

 rows formerly mentioned, and corresponding to the outer row of 



SCIEN. PROC. K.D.S. — VOL. VI. PT. VI. 2 C 



