1870.] 291 [Burgess. 



Nisoniades Martialis Scudder. Fig. 5. 



Upper organ : Main body long and slender, not elevated, unusually 

 small; crest consisting of a pair of depressed, slightly curving, lat- 

 eral expansions, nearly horizontal, the anterior angle produced as a 

 small, narrow, rounded lobe, directed outward and slightly forward. 

 Hooks short, moderately slender, slightly divergent, broadly sepa- 

 rated at base, the main body at their extreme base expanding later- 

 ally in a ridge nearly or quite continuous with the lateral arms ; tooth 

 stout, conical, directed somewhat forward, terminating bluntly with a 

 slightly elevated apical ridge. Arms slender, directed at first for- 

 ward and slightly downward, then downward and slightly forward, 

 finally bent abruptly at a right angle at the bottom, and continued 

 backward to the inferior armature, which is borne upon its upward 

 curved, slender limb, on either side of, and behind, the tooth. 



Left clasp : Main body increasing rapidly in breadth from the base 

 to the commencement of the lobe; transversely it is curved a little, 

 longitudinally it is almost straight. Blade of nearly uniform width, 

 elbowed just before the middle in an upward direction, and at the 

 same time bent at an angle of about forty five degrees inward, the 

 outer surface becoming uppermost, carrying with it the upper half of 

 the basal portion of the blade; the apical third of the outer surface, 

 and particularly the border and broadly rounded, faintly uncinated 

 tip, armed with minute spinules or raised points; a minute tubercle 

 shows the position of the basal process. The region of the lobe is 

 marked by a distinct furrow running far toward the base of the main 

 body; the lobe is of medium size, bent a little inward, with a slight 

 sinuosity, and is rudely triangular; the basal portion of its upper 

 border is a little swollen, its apical half slightly arched and thickened. 



Right clasp : Main body similar to that of the left piece but slen- 

 derer. Blade compressed and tuberculate at the base of the lower 

 edge like that of the left clasp, but having the upper edge slightly 

 thickened and bent inwards; it is broad at base, narrows slightly and 

 regularly for three fourths the distance to the apex, excepting a cen- 

 tral, broad, scarcely elevated denticle on the upper edge; is there 

 bent abruptly inward and slightly upward, then suddenly narrowed 

 and terminates in a bluntly rounded point ; this narrowed portion is 

 armed like the tip of the opposite blade; basal process wanting. 

 Lobe broad at the base, narrowing immediately, suddenly and ex- 

 tremely, and then developed into a somewhat compressed policiform 

 process of nearly uniform size, parallel to the basal portion of the 



