NEPHRIDIA AND BODY-CAVITY OF DECAPOD CRUSTACEA. 423 



[b) In the posterior part of the thorax the body- cavity is 

 entirely a hsemocoele. It consists of (I) the pericardial cavity," 

 in which lies (2) the heart, and which is separated by the peri- 

 cardial septum from (3) the central cavity of the body, which 

 contains the genital organs, liver^ intestine, and nerve-cord ; 

 (4) the lateral cavities, which communicate with the central 

 cavity and with (5) the cavities of the legs. 



(c) In the abdomen the body-cavity is entirely a hsemocoele. 

 It co-isists of a dorsal and a ventral sinus, which communicate 

 with one another by lateral sinuses. 



Literature referred to. 



1. Allek, E. J.— " On the Minute Structure of the Gills of Palsemo- 



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3. Glaus, G. — " Die Kreislauforgane und Blutbewegung der Stomato- 



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