PHYSIOLOGY OF THE INVERTEBRATA. 



Professor Huxley considers that the perivisceral fluid 

 represents ordinary blood as far as being a carried of wwtri- 

 ment to the tissues ; and that the pseudo-haBmal fluid is 



* C. "5<LHl, 



•S II ''o 



probably only engaged in the function of respiration ; hence 

 the reason that he calls it " respiratory blood." 



After these general remarks we proceed to detail at length 

 the pseudo-hEemal systeno-s- of Zumbricits and Hirudo. 



(«) In Zumbricus, there are three principal vessels which 



