CHAP, ii ABDOMINAL VISCERA 25 



the abdominal vein (abd. v) is severed and turned backwards. The right ovary 

 and fat-body are removed, and the right oviduct (r. ovd) is slightly displaced 

 outwards. 



abd. v. abdominal vein ; ccel. mes. splanchnic or coeliaco - mesenteric artery ; 

 cp. ad. corpus adiposum, or fat-body ; d. ao. dorsal ^ aorta ; gul. gullet ; 

 hu. cut end of humerus or upper-arm bone ; /. au. left auricle ; /. Ing. left lung ; 

 /. ovd. left oviduct ; /. ovd ' . its opening into the body cavity ; /. ovd" . its pos- 

 terior dilatation ; /. ovy. left ovary ; Ir. portion of liver ; pt. cv. postcaval vein ; 

 pt. cv . its anterior portion passing between the liver and the heart ; r. au. right 

 auricle; ret. rectum; r. kd. right kidney; r. Ing. right lung; rn.pt. renal 

 portal vein; r.ovd. right oviduct; r.otd". its opening into the body-cavity; 

 r. ovd". its posterior dilatation ; syst. tr. systemic arterial trunks at their 

 point of union ; u. bl. urinary bladder ; ur. ureter ; v. ventricle. 



number of streamer-like lobes (cp. ad} ; this is the fat-body, 

 which serves as a storehouse of reserve nutriment. 



By lifting up either of the ovaries there is seen beneath it 

 in the natural position of the parts above or dorsal to it 

 a greatly convoluted colourless tube (/. ovd, r. ovd} of about 

 the same diameter as the intestine. This is the oviduct, 

 through which the eggs pass from the ovary to the cloaca. 

 If the specimen is allowed to remain long in water the 

 oviducts will be found to swell and finally to become dis- 

 integrated ; this is due to the fact that in them is formed the 

 jelly in which the laid eggs are enclosed, and which, as 

 already mentioned (p. 9), swells in water. 



In the male there is seen, on turning the intestines aside, 

 a pair of yellow ovoidal bodies (Fig. 3, r. spy} about half an 

 inch long, attached by peritoneum to the dorsal wall of the 

 body-cavity. These are the spermaries or testes ; they manu- 

 facture the spermatic fluid or milt by which the eggs are 

 impregnated. To the anterior end of each is attached a 

 fat-body (cp. ad}, like that of the female. In young speci- 

 mens of both sexes the reproductive organs spermaries, 

 ovaries, and oviducts are very small. 



When the intestine is turned aside there will also be seen, 

 in both sexes, a pair of flattened, irregularly-oval bodies (Figs. 

 3 and 4, r. kd} lying in the posterior part of the abdominal 

 cavity just above or dorsal to the ovaries or spermaries. 



