29 



backward, the cTistal portion tapering very slightly ; viewed from above, 

 it appears to curve slightly inwai'd, to be strongly depressed, the in- 

 ner margin curved slightly downward in the middle, pretty slender, 

 the basal half of nearly uniform width, just beyond the middle fur- 

 nished -with a slight tooth on the inner edge, beyond whicli the blade 

 is strongly excised and contiinies again of nearly equal Avidth, but 

 tapering slightly to the well rounded tip, which is serrulate with in- 

 curving hooks ; basal process shaped somewhat as in N. Vlrrji/hi.'^, 

 but smaller and more spatulate, almost the whole margin serrulate 

 with blunt spines. Lobe consisting of a very broad and short, broadly 

 rounded extension of the upper hind angle of the main body, di- 

 rected backward and upwanl, its lower corner angular and incurved 



RigJit clasp : Main body broad, not so full at the base above as on 

 the opposite side but distinctly angulated and even slightly produced 

 in the middle of the u^iper half. Blade not very long but broad, di- 

 rected slightly upward, the outer sin'faee twisted over so as to be al- 

 most horizontal, the middle of the inner edge depressed still more, 

 the inner edge a little swollen in the middle of the basal half, beyond 

 excised, broadest at the tip, which is obliquely and squarely docked, 

 most minutely serrulate and slightly , curved ; basal process want- 

 ing. Lobe exceedingly broad and very short, directed backward 

 and upward, very gibbous, the upper angle produced roundly and 

 considerably, the lower forming the hind process — a rather small, 

 triangular, bluntly pointed denticle, serrulate on the edge. 



California, H. Edwards. 



Guotrp VIII. 



Upper organ : unknown. Clasps : left blade exceedingly broad 

 and rapidly tapering; Its basal process nearly sessile; upper process 

 of left lobe greatly developed; I'ight lobe developed similarly and 

 parallel to the right blade, but smaller. 

 Nisoniades Plautus nov. sp. Fig. 16. 



Upper organ: This portion of the only specimen we have seen 

 proves to be damaged to such a degree that neither drawing nor 

 description could be made; we can only say that it seems to differ 

 from all the usual types of this extraordinary genus as greatly as the 

 clasps do. 



Left clasp : Main body large, broad, widening, quite gibbous, 

 roundly curved longitudinally. Blade excessively broad, more than 



