ANATOMY 



457 



The epithelium covering the nerve-ring is slightly modified in 

 the neighbourhood of the kidney pore, and may have some special 

 sensory function; no other organs of sense are known (but see p. 454). 



Phoronis is hermaphrodite, male and female reproductive cells 



FIG. 230. A schematic view of 

 the interior of the body 

 of Phoronis. The middle 

 seven-eighths of the body are 

 omitted, a/, Afferent blood- 

 vessel ; an, anus ; ef, efferent 

 blood - vessel ; ep, epistome ; 

 gl, glandular pit ; int, intes- 

 tine or "second stomach" ; k, 

 large funnel of the left neph- 

 ridium ; ko, opening of right 

 nephridium, the opening of 

 the left is seen immediately 

 below in section ; m, mouth ; 

 n, nerve concentration ; oe, 

 oesophagus ; oem, oesopha- 

 geal mesentery ; ov, ovary ; 

 r, rectum ; rm, rectal mesen- 

 tery ; rv, right recipient 

 blood - vessel ; s, septum ; st, 

 stomach ; t, testis ; tm, right 

 lateral mesentery. (From 

 Benham.) 



Int 



being formed in the same individual The testes and ovaries 

 form two white masses lying on the left side of the stomach, one 

 on one side and the other on the other side of the efferent blood- 

 vessel. The glands are traversed in all directions by the diverti- 

 cula given off from this trunk, and are thus well supplied with 

 blood ; in fact both the ovary and the testis are formed by the 



