ßQQ L. R. Gary, 



dorso- ventral and lateral planes. Some of the folds lie above the 

 caecum, others below. 



Staffoed (1905) in the original description of tliis species does 

 not mention an}" lateral foldings, he says: "From it" (The excretory 

 bladder) "below, spring right and left lateral ducts, which pass below 

 the ends of the caeca and fold up and down along the outside of 

 the latter on their way forward to the region of the pharyngeal 

 pockets. Two large lymph vessels lie along the inner, lower sides 

 of the coeca and posteriorly approach each side of the bladder but 

 remain distinct from it". 



Anteriorly the lateral trunks extend to near the region of the 

 pharyngeal pockets where each one, after bending backward, breaks 

 up into a system of anastamosing vessels which extends to all parts 

 of the body. At its end each one of these branches receives a 

 number of small „collecting tubes" at the distal end of each of 

 which is situated a flame cell. 



Nervous system. 



The nervous system in Biplodisms temiwratus conforms to the 

 type generally found in the Malacocotylea. The central nervous 

 system consists of a pair of cerebral ganglia which are situated just 

 posterior to the pharyngeal pockets, and wiiich are connected by a 

 broad supra-oesophageal commissure. From each cerebral ganglion 

 a number of longitudinal trunks arise. One of these on each side 

 runs anteriorly and supplies the organs in that part of the bodj\ 

 Posteriorly three large trunks are given off from each ganglion. Of 

 these one pair is dorsal, the trunk from each ganglion being placed 

 quite near to the median line. Another pair are lateral in position. 

 These run along outside the water vascular trunks on each side of 

 the body. The third pair of nerve trunks lie in the ventral part 

 of the body. As regards their distance from the median line, they 

 are intermediate in position between the dorsal and lateral pairs. 



The three pairs of nerve trunks are connected by a complex 

 system of commissures. Justjposterior to the brain there is a small 

 commissure connecting the dorsal pair. Further backward there 

 are a number of large commissures which completely encircle the 

 body. At the posterior end of the body the dorsal and ventral 

 nerve trunks of the two sides bend inward and each pair becomes 

 connected. Branches are given off from the lateral trunks, and from 

 the commissures, throughout their entire length. 



