1900.] POLTNOID PROM NEW ZEALAND. 981 



of the neuropodium, lying on its dorso-anterior face rather than 

 directly dorsal (Plate LX. fig. 2 and Plate LXI. figs. 7, 8) ; 

 it has thus lost its direct connection with the dorsal cirrus which 

 springs from the " basipodium " or common base of the two para- 

 podial lobes (Plate LXI. fig. 7). As before mentioned, the base of 

 each parapodium, elytriferous or cirriferous, is produced dorsally 

 towards the median line as a broad flat ridge with distinct and 

 almost overlapping edges (Plate LX. fig. 3 and Plate LXI. figs. 7, 

 8). Eound the outer edges of the ridge, and especially at the base 

 of the dorsal cirrus, are numerous branchial outgrowths with 

 thin walls. The neuropodium bears a short but rather stout and 

 pointed ventral cirrus. The notopodial bristles are hair-like ; the 

 notopodials are typical chaetae. 



Both neuropodium and notopodium have large setigerous sacs, 

 but there are no acicular papillae noticeable, such as Bourne has 

 observed in L. elavus and //. squamatus [3]. 



Chceta?. — The neuropodial chaetae are large and stout, and number 

 about 30 to 35 in each foot ; they have a very slight S-shaped curve 

 towards the tip, which is somewhat tapered but blunt (Plate LXII. 

 fig. 11). The upper, or convex, surface is smooth all the way 

 along ; on the lower, or concave, side there is a smooth region just 

 below the tip, followed by a short spinulose region covered with 

 rows of minute filiform spines, but bearing no comb-like plates. 

 Below this the chaeta is marked by fine transverse lines, some 

 distance apart and gradually disappearing towards the embedded 

 end of the bristle. These neuropodial chaetae are arranged in the 

 sac in horizontal rows, the topmost row containing the longest 

 choetae, and the lower rows successively shorter. There are 

 generally five or six rows, with about six in each row. 



The notopodial chaetae, on the other hand (Plate LXII. 

 figs. 12 a, 12 b) are more slender and more numerous than the 

 neuropodial. The appearance of the bunch in situ is much like that 

 of a short, but rather broad, camel-hair brush. Examined under 

 the microscope, each bristle is seen to consist of two distinct 

 portions of about equal length. The proximal half is smooth and 

 hand-like, but broader in the centre than at either end. The distal 

 half has a median, narrow, smooth axis with a serrated portion on 

 each side, though often only one side is to be seen ; this portion 

 is of almost uniform breadth, tapering gradually to a very fine 

 point deprived of serrations. 



Pharyngeal Teeth. — The protruded pharynx terminates in a wide 

 aperture, transversely elongated and bounded by a dorsal and a 

 ventral lip, each of which carries a series of papillae (Plate LXII. 

 fig. 13). Of these, there is a median and 6 lateral on each side on 

 each lip, but the median papilla is not distinguishable from the rest 

 by any other peculiarity than its position. Each papilla is like a very 

 squat T ; the base is broad, the bar is also broad and oval, termi- 

 nating in a point at each end, as can be seen in fig. 14 on the left 

 side. The papillae diminish in size rather suddenly on the right 

 and left of the series. 



64* 



