MALMGRENIA AXDREAPOLIS. 383 



Body rather elongate, more than an inch in length, and having about 36 — 37 

 bristled segments. In some the posterior region (about a dozen segments) is prettily 

 mottled in the preparations with dark brown pigment both dorsally and ventrally. 

 Occasionally the brown bars, sometimes with a pale centre, are best marked on the 

 ventral surface. Very little tapering of the body occurs anteriorly. The ventral surface 

 is for the most part pale and finely iridescent. The segmental eminence is prominent, 

 but a special papilla cannot be made out. 



Scales (Plate XXXIII, fig. 11) probably fifteen pairs, but no specimen is complete. 

 The first pair are rounded, with a broad belt of madder-brown round the edge and a 

 spot in the centre, though in some the latter joins the outer portion of the ring. The 

 rest are reniform or irregularly rounded. The second scale in some has a brown ring 

 round the exposed part, and a patch near the outer border anteriorly, representing the 

 spot in the centre of the first pair and that of the scales behind. Those after the second 

 pair have a brown ring more or less complete, the broadest part beiug toward the inner 

 margin, and the spot at the anterior leg of the V-shaped mark gradually becoming more 

 evidently separated. About the sixth or seventh pair the V-shaped mark and the spot 

 become distinct. Posteriorly a tendency to the obliteration of the ring is observed, and 

 the spot becomes connected with the remnant of it at the inner border. In a few 

 the pigment in the posterior scales occurs in detached specks. 



The scales appear to be smooth under a lens, but under the microscope a belt of 

 small papilla3 occurs along the greater part of the anterior and outer borders (where 

 the curve is). This belt is continued in the reniform scales round the anterior and inner 

 corner. 



Feet. — As in the former species, the specimens seem to have lost the bristles in the 

 first foot. 



In looking at the feet from the dorsum it is observed, in contrast with if. castanea, 

 that the tips are blunt and somewhat bifid, though the posterior process is less prominent 

 than the anterior flap. In profile, again (Plate XXXI, fig. 3), the foot has a greater 

 depth from above downward in proportion to its length, and thus the terminal cone is 

 shorter. The dorsal division is less developed than in the former species, and bears a 

 series of slender, slightly tapered, inconspicuous, translucent bristles, with a peculiar tip, 

 which forms a kind of rounded knob (Plate XL, fig. 27, representing one of the larger 

 bristles), of much interest when contrasted with the ventral forms, since it demonstrates 

 how closely the same type holds in both divisions. The serrations are minute, and leave 

 only a short portion of the tip bare. 



The superior bristles in the ventral branch are long and translucent, have a long, 

 tapering, spinous region, with a distinct knob, like a probe-point, at the tip (Plate XL, 

 fig. 28). The spinous region quickly shortens in the succeeding forms, which show a 

 most interesting series of gradations from the first appearance of the secondary process, 

 the shortening of the probe-point and its gradual modification into a claw and a knob- 

 like tip with an oblique edge between it and the secondary process (Plate XL, fig. 29). 

 The spinous region in these is comparatively broad and short. Then, as the spinous 

 region diminishes inferiorly, the secondary process shortens and disappears, the bristles 



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