§5.112 



RESPIRATION 



181 



associated with the onset of moulting, which follows eyestalk 

 removal (Part II, § 3) and tends to obscure other effects. 



At Naples, Leander serratus shows no increase in oxygen 

 consumption after eyestalk removal, neither does this operation 

 lead to moulting, as in the other decapods so far considered 

 (Scheer and Scheer, 1954). Nevertheless, successive stages in 



N |IES| 2ES moult 



10 20 30 10 20 30 

 2SG I 2ES moult 



Fig. 5-7. Effects of eyestalk and sinus gland removal on the oxygen 

 consumption of land crabs, Gecarcinus lateralis, at 10-day intervals 

 after the treatments indicated, a and b show results from two 

 different crabs; N, when normal; 1 ES, after removal of one, and 

 2 ES, after removal of two, eyestalks; 2 SG, after removal of two 

 sinus glands only; arrows mark the time of ecdysis, or moulting, 

 preparation for which must have occupied several previous days 

 during which there is a great increase in oxygen consumption 

 (from Bliss, 1953). 



moulting are associated with changes in respiratory rate, and the 

 writers postulate control by two or three hormones acting in turn ; 

 but these have not been located. A further counterclaim that the 

 oxygen consumption of muscle homogenates from a number of 

 Crustacea could be decreased by removing the eyestalks of the 

 specimens shortly before taking the muscle samples seems to be 

 unfounded (Scheer et al., 1952). 



