328 ME, P. H. GOSSE ON THE OLASPING-OEGANS 



the median lino of the cavity, from a base that spreads like the base of a tree- 

 trunk, runs up a narrow harpe, nearly to the arch, and then bends over towards the 

 dorsal margin. It consists, on the ventral side, of three parallel lamina?, divided by 

 deep sulci, but united beneath, where the whole is in union with the lining-mem- 

 brane. Of these lamina?, the one next the ventral margin rises, abruptly, near its 

 middle, to a higher level than the others, which it maintains. All three have the free 

 edges cut into saw-teeth, on the ventral coarsely, on the others finely. 



The abdominal apparatus is very abnormal. I cannot find any trace of an uncus, nor 

 of a scaphium — unless, indeed, a minute rounded projection clothed with white hairs, 

 in the usual place of these organs, represents either or both of them. Then, the penis 

 appears to be double or even treble ; for after I had removed, for examination, one 

 organ, which corresponded, in position and form, to the penis*, there remained another 

 which had been beside it ; and this consisted of two parts — a hard chitinous thin blade 

 which terminated in a slender spine, and a membranous investiture which ran up its side 

 half embracing it, separating near the tip, and forming a thin yellow finger-like lobe. 



All these organs, however, need fuller examination. The termination of the abdomen 

 is profusely studded with long crowded grey hairs, under which they are almost hopelessly 

 concealed ; they are, moreover, very minute. The specimen examined was the only 

 example of the species in my cabinet. I have represented what I saw ; but I am not satis- 

 fied. The species is manifestly very anomalous. 



Papilio Nireus, Linn. (A. D.) (Plate XXXIII. figs. 13-10.) 



Valve approaching a trigonal form; scales of exterior slightly fringing the edge. 

 Cavity moderately deep ; a fringe of long hairs springs from the whole length of the 

 dorsal margin, and arches over the interior. 



Harpe a flattened rod or narrow plate, perhaps hollow, springing from an expanding 

 base, and following the middle of the floor to the extremity, where it becomes spathulate 

 (PL XXXIII. fig. 13). It is with case removed entirely from the valve, when we 

 see that the spoon-like tip, which is sometimes flat, sometimes hollowed, is studded with 

 short stout spines, closely set over its surface (fig. 15), and that the dilated base rises 

 into two or three conical eminences, one of which is cut into saw-teeth along its dorsal 

 edge (fig. 1-1). 



The uncus is an exceedingly slender spine with a fine-drawn point, projecting nearly 

 horizontally, with the slightest possible curve downward. It is keeled to about mid- 

 length. The scaphium is much more conspicuous, bent obliquely downward, with two 

 stout, blunt, erect, chitinous processes, which appear to represent the normal "double 

 teeth." The penis has a long finger at its upper extremity. In situ, all these parts are 

 concealed by the coarse shaggy coat of scales with which the abdominal segments arc 

 clad f. 



■■' I regret that I can say no more than this; but, when I had laid this organ on a glass slide for examination, 

 a draught of air carried it away, and I could not find it again. 

 t Sec remarks on P. Bromhis, at page 320, supra. 



