590 MONTGOMERY— MORPHOLOGY OF THE [April 24, 



on the fat-body ; in the Hymenoptera, Hemiptera and Coleoptera 

 on the pericardium ; in the Lepidoptera usually dorsal in the 

 abdomen ; in the Diptera along the heart. The pericardial cells of 

 Cuenot (1895) are perhaps to be reckoned with these. 



29. DiPLOPODA. 



Malpighian Vessels. — One pair proved to be excretory by 

 Kowalevsky (1896) and Bruntz (1903). 



Homologiics of Ncphridia. — Here are to be placed the genital 

 ducts, that develop like those of Peripatus (Heathcote, 1888) ; and 

 probably the salivary glands that are mesoblastic in origin (Heath- 

 cote), and which on account of their closed end sacs are named 

 " rein labial " by Bruntz. 



Fat-body and nephrocytes have been shown to be excretory 

 ( Bruntz). « 



30. ClilLOPODA. 



Malpighian Vessels. — There is one pair of these in all genera 

 (Verhoefif, 1902), and they develop as outgrowths from the 

 proctodseum (Sograf, 1883, Heymons, 1901). 



Homologiies of Ncphridia. — The genital ducts are mesoblastic 

 and to be compared with ncphridia (Heymons) ; and Herbst (1891) 

 has described for Lithohius a pair of glands with thin-walled end 

 sacs opening behind the second maxillae, and has suggested that these 

 may be modified ncphridia. The salivary glands are ectoblastic 

 and not to be compared with ncphridia (Heymons, 1898). 



31. SyM PHYLA (ScOLOPENDRELLA). 



There is one pair of Malpighian tubules; the ventral sacs are 

 simply respiratory skin glands (Haase, 1889). 



32. Pauropoda. 

 MalpigJiian Vessels. — There is one pair of these in Eiirypauropus 

 l)ut apparently only in the female (Kenyon, 1895). In Pauropus 

 they are absent (Schmidt, 1895), '^"<^ i" this genus there are groups 

 of cells in the fat-body that may be excretory (Kenyon). 



'Haase (1889) has demonstrated tliat the ventral sacs are neither ex- 

 cretory in fnnction nor nepliridial in origin. • 



