MYZOSTOMIDA FROM THE RED SEA. 



Text-fig. 21. 



97 



tnt 



^- ut. 



int. 



-ut. 



Myzostoma costatum. — Three transverse sections througli the centre of the body : 

 as in text-fig. 19, only the outlines of the various organs are shown and the 

 testicular-follicles are omitted. The sections are slightly oblique, so that 

 right and left halves of the figures show different regions. 



St. Stomach, int. Intestinal branch. nepJi. Nephridium. n. Ventral nervous 

 s}'stem. ov. Ovary, o. Anterior narrow end of the oviduct, ti. Median 

 division of the uterine coelom. ut. Branch of the uterus. 



Proc. Zool. Soc— 1913, No. VII. 7 



