Scudder.] 294 [April 27, 



ward, then curved backward and inward at nearly a right angle, 

 expanding at tip and on their united apices bearing the inferior arma- 

 ture, — a very large and broad field of raised points. 



Left clasp: Main body rather slender, the upper portion of the 

 obliquely docked base slightly full, and just beyond, anterior to the 

 lobe, a little excised; lower edge a little curved; longitudinally al- 

 most straight, transversely a little gibbous. Blade directed backward 

 and very slightly upward, long, compressed, slender, sinuous, regularly 

 and slightly tapering, bent a little inward and curving slightly in the 

 same direction; upper half of the outer surface bent strongly inward, 

 especially on the basal half, the apex very slender, bent abruptly 

 inward nearly at right angles, rounded and minutely serrulate at tip; 

 basal process with its anterior edge nearly opposite the denticle on 

 the lower edge of main body, marking the origin of the blade, and 

 consisting of a compressed, slightly gibbous, spatulate, well rounded, 

 almost sessile lobe, directed upward and a little backward, curving, 

 especially the upper half, a very little inward, the upper half, at least, 

 of the outer surface covered with short, blunt spinules; it is scarcely 

 as long as the width of the blade just beyond it. Lobe very broad 

 and very short, curving somewhat inward, rising abruptly from the 

 upper edge of the main body, directed upward and backward, its 

 anterior as long as its posterior margin, but the latter bent over in- 

 ward at right angles, the broad apical margin nearly straight, the 

 angles sharp. 



Right clasp : Main body slender, a good deal like that of the oppo- 

 site clasp, but more deeply excised. Blade very broad and less than 

 half as long as that of the opposite side, gibbous, twisted so as to 

 bring most of the outer surface nearly horizontal, curved inward, 

 scarcely downward, of nearly uniform breadth throughout, the apex 

 bluntly docked, its outer lower angle broadly rounded, its inner upper 

 angle square, very minutely serrulate and curved a little downward; 

 basal process mostly concealed from the outside, very peculiar, being 

 formed of an appressed pinching of the inner, upper, basal surface of 

 the blade, forming a small, transverse, rounded flap, slightly longer 

 than broad, directed inward and upward, and armed at tip with long 

 spinules. Lobe excessively broad and quite short, directed upward 

 and somewhat backward and inward, transversely rather strongly 

 curved, its outer angles broadly rounded and curved inward, its pos- 

 terior border strongly rounded and produced, and a little shorter 

 than the anterior, which is slightly excised; as viewed laterally, the 



