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Arnci'i dii'ected downward and a little forward, of nearly equal size 

 throughout, at bottom curved very abruptly backward and upward, 

 but with the lower edge expanding to meet that of the opposite side, 

 and bearing upon their united limbs the two I'ounded lobes, directed 

 upward and united at their edge, which form at once the apices of 

 the arms and the inferior armature of raised points. 



Left clasp: Main body large, gibbous, the base docked diagonally, 

 increasing a little in breadth outwardly, slightly curved longitudi- 

 nally, the upper edge incurved and lobed beyond the middle, docked 

 squarely at the apex; the outer half is deeply grooved above the 

 base of the blade. Blade very long and slender, strongly depressed, 

 nearly uniform in width, the apical third narrowing a little, the 

 whole curving strongly inward, the basal half also directed backward 

 in a straight course, the apical half curving a little upward, the ex- 

 ti-eme tip squarely appressed and bent inward, inner edge excised just 

 before the apex, and beyond minutely denticulate; basal process 

 broad at base, compressed, directed upward, its upper posterior angle 

 produced backward as a somewhat elongate, rounded lobe, separated 

 i'rom the blade, to which it is nearly parallel, by a very deep hollow- 

 ing; the basal portion of the upper edge curves slightly inward, the 

 whole upper outer margin, together with the apical half of the hind 

 prolongation armed with pretty strong but minute teeth. Lobe small, 

 consisting of a subspatulate flap, projecting from the upper hind 

 corner of the main body, bent strongly inward, but with an equally 

 upward backwai'd course, as long as the upper edge of the basal jiroc- 

 ess of blade and half as broad as long, the tip broadly rounded and 

 the apical half minutely jiitted. 



Riglil clasp: Main body much narrower than that of the opposite 

 side, nearly ecjual, excepting at the base, the upper margin Avith an 

 acute denticle in the middle, beyond which it is roundly and deejjly 

 excised. Blade long and rather slender, strongly compressed, twisted 

 just beyond the base so that the outer becomes the upjjer surface, on 

 a side view directed at first straight backward, then with a slight up- 

 ward curve and again at the tip straight backward; viewed from 

 above, curved a little and regularly inward, rounded and minutely 

 denticulate along the inner angle of the apex; basal process wanting. 

 Hind process of lobs consisting of a small, rounded, neai'ly semi- 

 circular, compressed pad, at the middle of the apex of the maia 

 l)ody, directed backward, curved a little inward, the apical half 

 minutely denticulate; upper process composed of a pretty large, sub- 



