402 "W. C. M'INTOSH ON THE ANKELIDA 



median line, and the outer part of the scales is tinted of a pale brownish hue. The 

 bristle-bearing segments amount to eighty-seven ; and the feet are deeply cut. The body 

 tapers from head to tail and terminates in the anus, on each side of which there is a short 

 cirrus. The head is small, and covered by the first pair of scales. Eyes four, somewhat 

 indistinct ; two placed near the posterior border, and two (which are wider apart than the 

 former) in front of the prominent lateral region. Tentacle absent ; but the base is of a 

 dusky brown hue, thus causing the somewhat elevated divisions of the head next it to 

 appear in relief. Antennae smooth. Palpi absent. Tentacular cirri long, filiform, and 

 smooth. There is no trace of enlargement below the tips of any of these processes. 

 The scales are almost all detached, so that it is difficult to determine them exactly ; 

 but they appear to number about thirty pairs, the first occurring on the second segment 

 and the last reaching the anal papilla ; they are pellucid, smooth, iridescent, brownish 

 organs, and under a high power are minutely granular, like the scales of certain fossil 

 fishes. In the pigment-region, moreover, pentagonal or hexagonal spaces are formed 

 with a clear point in the centre of each. A few clavate papillae occur at intervals on 

 the posterior surface and edge. From the surface of attachment various finely branched 

 nerves (1) proceed to the circumference. The first pair seemed to be large ; but several 

 loose scales exceeded them, so that a regular diminution from head to tail may not 

 hold. 



Each foot, when viewed from the dorsum, is bifid, having a long pointed papilla in 

 front, and one less acute posteriorly. The same appearance is noticed from the ventral 

 surface, the bristles emerging between the papillae. The dorsal cirrus arises near the 

 base superiorly, and is a smooth tapering process extending to the tip of the bristles. 

 The inferior cirrus springs about the middle of the foot, reaches a little beyond the 

 angle of the fork, is filiform, tapering, and smooth. Between this and the process at the 

 base of the foot there is a line of clavate papillae. Viewed laterally the foot is pointed from 

 below upward, a slight curve only existing at the dorsal edge ; the tip seems to be fur- 

 nished with whitish pigment along the border of the papillae. Tlie dorsal division is repre- 

 sented only by a spine, the blunt point of which projects as a prominent process covered 

 with cutaneous tissues to the exterior of the dorsal cirrus. The ventral branch has a 

 vertical series of dull yellowish bristles projecting between the pointed papillae of the 

 feet. The superior group (PI. LXXII. fig. 7) have long tapering tips ending in a slight 

 mucro or thickening of the point. The portion beneath is scaly rather than spinous, from 

 a series of sheath-like processes, which, in the position of the specimen figured, are seen 

 somewhat on their edge ; they form the usual alternate double rows ; and their arrange- 

 ment often gives the bristle the aspect of a diminishing rod with a spiral band. The 

 inferior series, often separated by an interval, commences with bristles having the type 

 of the former, but with shorter tips, terminated by a slightly curved hook; and the 

 bifid nature soon becomes developed in the others (PI. LXXII. fig. 8). The large 

 scale-like processes stand out prominently ; but it is difficult to represent these satisf'ac- 



