CHILOPODA. 



599 



M 



The fat-body consists of aggregations of fat cells in the wall 

 of the pericardial and perivisceral cavities. It appears to con- 

 sist of areticulum the cells of which contain fat, and is similar 

 to the fat-body of Onycho- 

 phora. 



Except in Scutigera (p. 604), 

 the tracheae * branch and 

 anastomose, and possess a 

 spiral fibre. They are dis- 

 tributed to the organs. The 

 stigmata, which vary in num- 

 ber in the different forms, are 

 placed on the pleural mem- 

 branes (except in Scutigera), 

 one pair in a segment. They 

 are most numerous in the 

 Geophilidae, in which all the 

 pedigerous segments except 

 the first and last possess a pair. 

 They are never found on the 

 head or on the segment of the 

 poison claws. They may be 

 slit-like (Lithobius, Scolopendra, 

 etc.), funnel-shaped (Geophilidae), ear-shaped (Otostigmus), or 

 sieve-like (Heterostigma). The tracheal system of Scutigera is 

 described at p. 604. In this form the stigmata are dorso- 

 median, and the tracheae are without spiral fibre and prac- 

 tically unbranched. 



The reproductive glands f are placed in the middle and pos- 

 terior portion of the body on the dorsal side of the gut. They 

 open on the ventral sunace immediately in front of the anus 

 on the penultimate segment. 



The ovary is single and median ; it passes behind into an 

 oviduct which divides into two. These embrace the rectum and 

 join again beneath it to open by the median genital opening 

 (Lithobiidae). In some forms one of these two oviducts is 



* .E. Haase, Das Respirationssystem der Symphylen imd Chilopoda, 



Schneider's Zoologische Beitrtiye, 1, p. 05. 



t B. Schaufler, Zur Kenntniss der Chilopoden, Verh. Zool. bot. Gesel. 

 Wien, 1889, p. 405. C. Tonniges, Beitr. z. Sprrnmtogenese u. Oogeiiese 

 der Myriopoden, Z.f.w.Z.. 1902. 71. p. 328. 



FIG. 359. Head and anterior segments of 

 Scolopendra (after Newport). G cerebral 

 ganglion ; eyes ; A antenna ; Kf max- 

 illiped (poison-claw) ; C heart ; M alary 

 muscle ; Ar arteries. 



