TWO AQUATIC OUGOCKffiTES. 



31 



Ol 



sp. m._ , ~-.W 



■y PCll 



Fig 



L. gotoi. Semidiagrammatic longitudinal section 

 of penis and related organs ; distal half not shown, 

 con — peritoneal connective tissue, cm — circular 

 muscle of atrial duct-portion, ol— lining epithelium 

 of the penial chamber, il — inner epethelium of the 

 penis, pch — penial chamber, sp.m — spiral muscle, 

 cs — chitinous sheath. 



Fig. 22. 



L. gotoi. Penis ; sketched by 

 Dr. A. Willey from an Indian 

 specimen, m — muscle fibres. 



The lining epithelium of the penial chamber is attached to 

 the chitinous sheath for a short distance at its base. It then 

 becomes thinner very gradually and near the end of the penis 

 it again thickens more or less suddenly and is finally continued 

 into the hypodermis of the body wall. The male pores lie on 

 either side of the ventral median line, behind the middle of 

 segment XI, and in the same longitudinal lines with the ventral 

 seta-bundles. The wall of the penial chamber near the external 

 pore is irregularly folded and is composed of five layers, which 

 are direct continuations of those of the body wall. The inner- 

 most layer is the cuticle ; the next is the cellular hypodermis 

 containing many gland cells, while the remaining layers are very 

 weakly developed, the peritoneum being transformed into a thin 

 connective tissue layer. 



