PERIVISCERAL FLUID OF ECHIXODERM-. 235 



In addition to the active leucocytes there are always present, 

 even in a drop of freshly drawn pern i-ceral fluid, numbers of 

 flattened cells with filiform processes which float pa>- ively 

 through the fluid f FL-. i =; 22). The endoplasm of these cells is 

 granulated, opaque and \\icuolated. is the endoplasm of the 

 active leucocytes and it reacts the same to methylene blue-sea- 

 water or neutral red--eawater solutions, i.e., the vacuoles stain 

 blue and red respectively. Since I have oler\ed active leuco- 



: 1 till- Ki-llilli.lllTIIl-:. i.ini'-I.l luri'ki, X ' 



15. / -.iuscula. i :f>">iii-ii. 18. 



'r simp- 

 :ta. 



cytea hani;inL; into the-e in .\rbac i>i. I think that they are pa>-ive 

 phar-e-. of the leiu oc\ i, -. Tlieel re.^anU them as di-tiiut in 

 tlu-in-eU'e- and 'ill- them "hyaline pla>ma-am<ebocytes. " 

 Their pre-eiuv in the fre-hly drawn fluid would indicate that they 

 are normally prc-etit and that their occurrence is not due to 

 abnormal conditions .1- '.-odridi suggested. Although these 

 cells may occur Miigly. they are most frequently met with as 



