090 Dr. T. A. Cliapnian on Asymmetry in 



a ridge with fine serrations. On the upper dorsal margin 

 this ridge is practically along the margin, on the lower 

 (right) margin it is unarmed along the margin, but serrate 

 wiiere it runs almost directly forwards, along and parallel 

 to the axis of the tube. 



En. cJpenur. — Symmetrical except the mloKigus, which lias 

 a ridge starting at the extremity dorsally, and passing 

 obliquely forwards and to the left, and carrying a row of 

 hooks or spines directed forwards (backwards if one calls 

 the direction of the end of the penis forwards). The 

 xdmagus is comparatively short and thick. 



En. ])orcdlus. — So far as asymmetry is concerned, the 

 description of clpenor might be accurately applied to 

 2wrccUns. There is some variation in individuals as to the 

 oblique ridge. It is sometimes much less pronounced than 

 in otliers. The genitalia are very much alike in these 

 two species in all respects. 



D. idricus. — There projects from the xcheagus, close to its 

 extremity and on the right side, but close to the ventral 

 aspect, a short hook, that projects downwards and curves 

 to the left. 



Ncphele viridcsccns. — The prolonged and thickened 

 margin of the c'edceagus is here on the left side, but it is 

 prolonged over the dorsum so that its very thickened end 

 is nearly GO to the right of the medio-dorsum, the thinned 

 termination below to the left, almost reaches the ventral 

 aspect. The margin of this flange has a series of rather 

 long, very appressed spines. The thickened (right) end of 

 the ridge projects some distance beyond the rest of the 

 tube, and carries a short corkscrew-like spine, which is 

 directed as it curls first distally then dorsally and finally 

 to the right. 



Dilophonota cllo. — ^dceagns rather long and slender, 

 terminating in an oblique opening, giving a sharp apex to 

 right side. The lower margin of the opening has from this 

 apex a ridge carrying a few sharp spines, the upper margin, 

 from the apical point, runs more directly forwards in lino 

 with the tube, and carries a much greater number of very 

 closely-packed smaller spines. The general scheme very 

 similar to Gelcrio. 



Acosmcryx nnccus. — Margin longest right upper corner. 

 A serrated flange runs down from this on lower (ri>;ht) 

 margin, and from the side of the extremity there is a spine 

 directed to the left across the upper margin about '5 m.m. 



