236 DESCRIPTIONS ÜF EARTHWORMS. 



The prostata (fig. 5) is a lobatecl organ , about as long 

 as broad ; it is divided by a deep notch in two halfs , 

 which show four or five secundary lobes. 



The gizzard belongs to segment 8 and 9; in the 11th 

 and 12tli segment the wall of the intestine shows a glan- 

 dular thickening. The sacculated intestine commences in 

 segment 15; intestinal coeca are present in the 2Gth 

 segment. 



The vascular system possesses the usual structure ; intes- 

 tinal hearts are situated in segment 10, 11, 12 and 13. 



The nephridia form a tuft of small tubules , specially 

 visible in the anterior segments. 



Going over the known Ferichaeta-species , with two pairs 

 of spermathecae , specially those from the Malayan Region , 

 the specimens from Billitou could not be identified with 

 one of them. This new species may be named in honour 

 of Dr. C. Ph. Sluiter, the well-known naturalist of Batavia. 



In regard to the structure of the spermathecae P. sluiteri 

 shows much resemblance to P. quadragenaria Perrier '); 

 however according to Perrier's description this species has 

 only one pair of spermathecae and no more than 40 setae 

 in each row. P. sumatrana Horst 2) also differs by its small- 

 er number of setae (38) ; in his turn P. hasseltii Horst '') is 

 distinguished by the closely placed ventral setae, as well 

 as by the shape of the spermathecae. In P. musica Horst 

 (fig. 6) and P. annulata Horst (fig. 7) the spermathecae 

 have also a totally different structure; moreover the first 

 named species has a much greater number of setae in each 

 row (100). 



Leyden Museum, October 1890. 



1) loc. cit. p. 122. 



3) loc. cit. p. 5 , fig. 2. 



3) loc. cit. p. 6, fig. 3. 



Notes from tlie Leyden IMuseum, "Vol XII. 



