94 



DR. C. L. BOULEN^GER OS 



Surrounding the base of the pharynx and the extreme anterior 

 end of the stomach is a thick ring of cells (cf. PL VIII. fig. 3) 

 resembling the " multipolar " cells described by Nansen ((15), 

 p. 71) as occurring close to the circum -oesophageal nerve-ring in 

 several species, and which he considered to be ganglionic cells 

 forming a kind of sympathetic system. Similar cells were found 

 by V. Stammer (16) in J/, asterice, but this author showed that 



neph. - 



red. 



Myzostoma costatum. — Longitudinal horizontal section through part of the 

 body to show the position of the ovaries and nephridia. 



sif. Stomach, rec^. Rectum. tW. Intestinal trunk, oy. Ovar}-. Mejj/i. Nephridium. 



their minute structure differed considerably fi-om that of gan- 

 glionic cells, and that the presence of secretion granules and 

 capillary ducts indicated that they were of a glandular nature. 



The cells surrounding the anterior end of the stomach of 

 M. costatuvi very closely resemble those described by v. Stummer 

 (cf. (16) p. 551, pi. xxxvii. figs. 5 & 6) ; in this species, however, 

 they are more numerous and not so scattered ; moreover, the 

 capillary ducts are all directed towards the gastric epithelium. 



