PHYLUM ARTHROPODA 



625 



given off eight tubular hepatic cceca (hep. cce.) blind tubes 

 somewhat narrower than the stomach. The point of junction 

 of the stomach with the intestine is marked by the presence of 



FIG. 4y.j. Semi-diagrammatic view of the internal organs of female Cockroach, dissected 

 from the left side. The heart is not represented, abd. 1 , abd. 5 , first and fifth abdominal segments; 

 abd. gang.S sixth abdominal ganglion ; an. anus ; ant. anteunary nerve ; brn. brain ; cer. 

 cercus ; ccec. cteca ; coll. colleterial glands ; er. crop ; gizz. gizzard ; yon. gonapophyses ; 

 inf. gang, sub-cesophageal ganglion ; int. intestine ; Ib. pip. labial palp ; l.ov. left ovary ; 

 malp. Malpighian tubes ; mx. pip. maxillary palp. ; od, points to the external opening of the 

 median oviduct (vagina) ; ces. oesophagus ; o/tf. optic nerve ; rec. rectum ; r.ov. right ovary ; 

 sal. ffld. salivary glands ; sal. rec. salivary receptacle (left) ; sal. du. salivary ducts, indicating 

 the point at which the median duct of the salivary glands unites with the median duct of 

 the salivary receptacles ; spir. stigmata ; st. 7, sternum of the seventh segment ; te. 10, 

 tergum of the tenth segment ; tli^, th2, th$, first, second, and third segments of the thorax ; 

 thor. gang 1 , first thoracic ganglion. 



very numerous thread-like yellow appendages the Malpighian 

 tubes (malp.) which are the renal organs of the animal. The 

 intestine (int.) terminates 

 in a dilated portion the 

 rectum (ret.) the walls of 

 which are longitudinally 

 folded. Of the entire ali- 

 mentary canal only a small 

 part the stomach with 

 the appended hepatic caeca, 

 is of the nature of a mesen- 

 teron, the region in front 

 being a stomodaeum, and 

 that behind a proctodseum. 



The heart is an elongated tube, closed behind, open in front, 

 running along the middle line of the abdomen and thorax, imme- 

 diately beneath the terga. Internally the tube is divided into a 



FIG. 496. Right salivary glands and salivary recep- 

 tacle of Cockroach. (After Miall and Denny.) 



