MYRIAPODA 415 



followed by a preanal segment, the appendages of which are the cerci. 

 On the anal segment appendages are vestigial. 



In the head, six pairs of coelomic sacs are formed, and in the abdomen 

 each segment is provided with a single pair. The antennary and pre- 

 antennary coelomic sacs together form the aorta. The coelomic sacs, 

 from the mandibular segment backwards, grow through the yolk cells, 

 enclosing part of these as mid-gut epithelium ; they all furnish cardioblasts 

 for the heart. The premandibular coelomic sac gives rise to a large 

 excretory gland which degenerates at the time of eclosion; in association 

 with it is a clump of nephrocytes, perhaps homologous with the sub- 

 esophageal bodies of insects. The salivary gland is a remnant of the 

 maxillary coelomic sac. 



The genital tubes arise by concrescence of the vestiges of the coelomic 

 sacs from the fourth abdominal to the preanal segments. Vestigial 

 coelomoducts survive in the preanal segment until after eclosion. 



The ganglia of the nervous system develop in association with "ven- 

 tral organs" as in Peripatus. From the remnants of these organs the 

 eversible sacs arise. 



References 



Onychophora: (Included here for convenience) Bouvier (1905). Euperipatus 

 weldoni: Evans (1902). Peripatus sp.; Balfour (1883), Ryder (1886a), Willey (1898). 

 P. capensis; King (1926), Mosely (1874), Sedgwick (1885-1888). P. edwardsi; 

 Kennel (1886). P. imthurmi; Sclater (1886). P. novae-zealandica; Sheldon (1887). 

 P. torquatus; Kennel (1886). 



Chilopoda: Heymons (18986); Verhoeff (1925). Geophilus sp.; Balbiani (1883), 

 Leydig (1889), Metschnikoff (1874). G. ferrugineus; Zograf (1882, 1884). G. 

 proximus; Zograf (1882, 1884). Lilhobius sp.; Leydig (1889). L. forficatus; Biegel 

 (1922). Scolopendra sp.; Heymons (1898a), Nath and Husain (1926). S. cingulata; 

 Heymons (1901). S. dalrnatica; Heymons (1901). 



Diplopoda: Cholodkowsky (1895). Craspedosoma sp.; Stecker (1877). Glomeris 

 sp.; Heymons (1897d), Stuhtman (1886). Jidus sp.; Stecker (1877), Stuhlman (1886). 

 /. moreletti; Metschnikoff (1874). J. terrestris; Heathcote (1886), Newport 

 (1841). Pachyiulus communis; Silvestri (1898). Platyrhacus amauros; Pflugfelder 

 (1932). Polydesmus sp.; Stecker (1877). P. abchasius; Lignau (1911, 1912). 

 P. complanatus; Metschnikoff (1874). Polyxenus lagurus; Metschnikoff (1874). 

 Strongylosoma sp.; Stecker (1877). S. guerinii; Metschnikoff (1874). 



Pauropoda: Pauropus amicus; Harrison (1915). 



Symphtla: Hanseniella sp.; Tiegs (1939). 



^^^C^l 



