of Rhipiphorus paradoxus. 919 
posterior edge; the eleventh is oval, with two rather longer 
bristles at the sides, and two shorter ones between them ; the 
twelfth is similar to but smaller than the eleventh, and with 
only short bristles; the thirteenth is immediately behind this 
and close to the extremity of the body ; it consists of a rounded 
Subtriangular piece, with its outer rounded extremities curled 
round so as nearly to meet, and a separate narrow prece at its 
posterior margin ; from within the curled edges there proceed 
backwards two transparent processes, each with a disk-shaped 
extremity. 
The dorsal plates are situated in the sulci between the 
A careful examination of a prepared specimen of the suckers shows 
them to be appendages of a three-jointed tarsus, in addition to which 
there are one or two claws (spurs at the extremity of the tibia ?). 
