ANATOMY OF ARACHNIDS 7 



and modification of three originally distinct glands on segments 

 III, IV and V, whereas the two coxal glands of the Charontini 

 are entirely distinct organs belonging to segments III and V, 

 one of which has been lost in Tarantula and Phrynicus. 



Tartarides. 



Species examined : 



Schizomus peradeniyensis, Peradeniya, Ceylon. 

 Schizomus vittatus (Gravely), Peradeniya, Ceylon. 

 Schizomus perplexus n.sp. (Gravely), Plains, Ceylon. 

 Schizomus modestus (Hansen), Kedah, Malay Peninsula. 



It is only within the last four or five years that any collector 

 has been able to obtain large numbers of the Tartarides. 

 Messrs. Green and Gravely, in the botanical gardens of Pera- 

 deniya in Ceylon, used a sieve with which they sifted fallen 

 leaves and debris over a large sheet of stiff paper, the Tartarides 

 and small insects falling through the meshes. iVdopting this 

 method I was fortunate enough to secure, not only at Pera- 

 deniya, but also on the plains of Ceylon and in the Malay Penin- 

 sula, nearly 500 specimens of these interesting little animals, 

 of which more than 50 were fixed on the spot and sectioned 

 later. The type species — S. crassicaudatus — can not be col- 

 lected in this way, as it occurs under stones and bricks. A few 

 specimens were secured in Ceylon but they were not sectioned. 



Owing to their small size and the minuteness of their organs 

 and individual cells it is not easy to determine the details of the 

 coxal glands, but from a comparison of a large number of speci- 

 mens one may conclude that the fundamental arrangements of 

 the organ are precisely similar to those obtained in the Thely- 

 phonides. There are two flattened tubular saccules, one in 

 segment IV and another in appendage V, from each of which 

 a collecting duct, consisting of five or six minute cells, leads into 

 a labyrinth tubule running posteriorly to segments V and VI 

 respectively. The labyrinth, lined with striated cells, coils very 

 little and is much simpler in construction than that of Thely- 

 phonus, but nevertheless it has not been found possible to deter- 

 mine just where coalescence of the two tubules takes place be- 



