I2O Invertebrate Zoology. 



near the lung-sacs. In the lung-sacs it is purified, and from 

 thence passes directly to the pericardium. 



The Reproductive System. The ovaries of the female 

 often nearly fill the abdominal cavity, the ova being very 

 irregular in outline, as a result of their mutual pressure. 

 The oviducts may be traced to the external opening already 

 noted. Lying on either side of the external opening is a 

 coiled tubular organ, the receptaculum se minis, that receives 

 the spermatophore of the male, and retains the spermatozoa 

 until the time of egg-laying. The testes of the male are 

 elongated tubular glands, which lie longitudinally along the 

 lower portion of the abdominal cavity. Before opening to 

 the exterior each gland is continued into a coiled vas 

 deferens. 1 



The Digestive System. The straight intestine will be 

 found to lie immediately under the heart and to give off lat- 

 erally several ccecal diverticula. Followed posteriorly, the 

 intestine opens into an enlarged rectum, which also receives 

 the ducts from certain many- branched tubes, the Malpighian 

 vessels. 



Followed anteriorly, the intestine passes through the 

 peduncle and enlarges within the cephalothorax into a 

 stomach. From the stomach, ccecal diverticula extend out 

 as loops into the bases of the legs. Certain gastric muscles 

 are so arranged that they can enlarge the central portion of 

 the stomach, which thus acts as a sucking-organ. 



The oesophagus may be followed as a tube leading from 

 the mouth to the stomach. 



1 The spermatic fluid is collected in the pedipalps and retained in 

 spermatophores until transferred to the receptacula of the female. 



