452 



MR. J. H. LLOYD ON TIIK STRUCTLRE AND LI FJi- HISTORY 



mid-ventral line, almost as far distant posteriorly from the nerve- 

 ring- MR the latter is from the anterior end. 



The "tail" of the male (text-fig. 2) is coiled usual!}^ in a 

 single ring, bnt occasionally into a spiral of two rings. There 

 is an egg-shaped bursa, to light a,nd left of whicli the cuticle is 

 drawn out into wing-like expa,nsions, su})})orted by eight costal 

 pa[)illae on each .side. Van Beneden (2) states that there are six 

 or seven papillpe on each side. These paj)illae are pedunculate in 

 form and are arranged symmetiically in two rows. 



There is a single papilla at either end of each row ; between 

 the extreme papillae are six others arranged in three paii'S. On« 



Text-fii-ure 2. 



Lateral view of tail of male Proleptns seiUicola, showing- large and .small 

 spicules and costal papilhe. 



pair is situated in the region of the cloaca, and the two remaining 

 pairs are posterior to it. The pi-e-cloacal papilla3 are somewhat 

 longer than the remainder. Linstow (9) has figured three 

 papillae on each side of the cloaca, but after careful examination 

 of many bursse, I have failed to discover the third papilla. 



Two copulatory spicules of unequal length are present, the left 

 being approximately five times as long as the right. The average 

 length of the longer spicule is 2-125 mm. and of the shorter 

 •41 mnj. 



The longer spicule is curved towards the distal end, and at the 

 beginning of the curvature there is a prominence on the convex 



