the seminal papilla opens into the glandular groove. One 

 ctenactinium present, slender, curved backwards and upwards, 

 then forwards to below the eye, and, finally, downwards and 

 across beneath the chin. Length 30 mm. [After TATE REGAN, 

 not seen by us]. 



Habitat: Singapore, Malay Peninsula (Muar river). 



Brackish water. 



