NEW MALI.01'IIA(iA. 195 



tlie ventral rod. Ventnul of these last are two small 

 cusps. The dorsal laiuiiue are iiuicli longer than the 

 others, but the central tube projects a little beyond 

 them. The last abdominal sternum is a wide, rounded 

 plate which projects backwards so as to lie beneath the 

 penis when this organ is protruded. 



Giebelia mirabilis. (Plate Xi.\', fig. 4). 



In this species the penis consists of the same parts as 

 the two last described, there being present an internal 

 plate, an external conical median part, and two lateral 

 processes. The plate is wide and comparatively very 

 short, its kMigtii being only a little greater than its 

 breadth. It lies within the body close to the ventral 

 wall, and to its dorsal surface muscles are attached. 

 The sides are a little concave, its anterior border 

 straight with corners rounded. The lateral basal parts 

 are thicker than the rest. The external intromit- 

 tent part of the penis is short, wide, with con- 

 vex lateral edges, rapidly contracting distally, and 

 ending in the middle line with a short, narrower })ro- 

 longation. This is not entirely chitinized as in the 

 other forms described for its distal half is almost mem- 

 branous. At the base of the internal plate on its 

 dorsal side the ductus ejaculatorius enters the external 

 penis. The two lateral processes are short and thick, 

 each being only a little longer than half the internal 

 plate. They are curved, havinu the convex edges 

 turned outward. They converge posteriorly but the tips 

 are turned straight backwards forming an angle with 

 the rest, so that the terminal parts lie parallel with 

 each other. Their bases are enlarged anil movably 

 articulated to the rest of the penis as in the other 

 forms described. The articulation is the same as that 



