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PHYLUM ARTHROPODA 



626 



given off eight tubular hepatic cmca {hep. cm.) — blind tubes 

 soiih what narrower than the stomach. The point of junction 

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



zl.fl Ofl Pulnce Ik * a . id ' ■ gbi 



oil 



Flo. 495. — Semi-diagrammatic view of the internal organs of female Cockroach, dissected 

 from the left side. The heart is not represented, abdj, abd.*>, first and fifth abdominal segments; 

 obi. Jin a ;/.^ sixth abdominal ganglion ; an. anus; ant. antennary nerve; bm. brain; cer. 

 ccrctis ; car. ataca ; coll. colleterial glands ; cr. crop ; gizz. gizzard ; <jon. gonapophyses ; 

 in/, ijainj. sub-o3sophageal ganglion ; int. intestine ; lb. pip. labial palp ; l.ov. left ovary ; 

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

 median oviduct (vagina) ; as. oesophagus ; opt. optic nerve ; we. rectum ; r.ov. right ovary ; 

 ml. (ild. salivary glands ; *al. rer. salivary receptacle (left) ; sal. da. salivary ducts, indicating 

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

 the salivary receptacles ; *p'u: stigmata ; $t. 7, sternum of the seventh segment ; te. 10, 

 tergum of the tenth segment ; tM, tt&, th^, first, second, and third segments of the thorax ; 

 thor. gangl, 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 stomodamm, and 

 that behind a proctodeum. 



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'i<;. 490. Right salivary glands and salivary recep- 

 tacle of Cockroach. (After Wall and Denny.) 



