PHYLUM ARTHROPODA 



f)25 



given off eight tubular hepatic cceca {hqh cm.) — blind tubes 

 somewhat narrower than the stomach. The point of junction 

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



saf.j;!. fK^ C'Oirec t/i3 







Fig. 495. — Semi'diagranimatic view of the internal organs of female Cockroach^ dissected 

 from the left side. The heart is not represented. a&tLi, ahd 5, first and fifth abdominal segments; 

 ahfl. cjanfj.^ sixth abdominal ganglion ; an. anus ; ant, antennary nerve ; bvn. brain ; t'w. 

 cercus ; ccec. cieca ; coll. coUeterial gl.ands ; cy. crop ; gizz. gizzard ; ^071. gonapophyses ; 

 Uif. ija-iiiu sub-cesophageal ganglion ; int. intestine ; Ih. 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) ; o'«. cesophagus ; opt. optic nerve ; rcc. rectum ; r.ov. right ovary ; 

 sal. gld. salivary glands ; sal. rec. salivary receptacle (left) ; sal. 'hi. 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, 

 tergnm of the tenth segment ; th^, th^, ilfi, first, second, and third segments of the thorax ; 

 thor. fiangi, first thoracic ganglion. 



very numerous thread-like yellow appendages — the ifcdpighian 

 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 stomodsoum, 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 



I'iK. 4'.'n. — Right salivary glands and saliv.ary rcccp- 

 lacle of Cockroacll. (After Miall and Denny.) 



