302 PALLASIA ML'IiATA, N. SP. : A NEW BRITISH SABELLARIAN. 



have the same general shape as the palps of Spiouiclffi and Disomidfe 

 {e.g. Pcecilochcetus), being D-shaped in section with the flattened (or 

 grooved) surface, bordered by a crenate membrane. 



Meyer (1888, p. 507) suggests that the peristoniial lubes (Paleen- 

 triiger) represent the notopodia of the first segment of the body. This 

 view is supported by the striking resemblance between the relations of 

 the parts in Pallasia murata and that found in Pcecilochcctus* where the 

 parapodia of the first segment are much enlarged and directed forwards. 

 It may be noted in this connection that Meyer considers that the Her- 

 mellidae are nearly related to the Spionida?, with which family Pcecilo- 

 chcetus also is closely allied. 



The neuropodial cirrus of the second segment is seen immediately 

 behind the mouth. It consists of a flattened, triangular lol)e,f from in 

 front of which a bundle of hair-like bristles arises. The notopodium 

 of this segment is represented by two broad, flattened, forwardly 

 directed, fin-like processes, extending transversely along the lateral 

 surfaces of the body, and running out into two or three points. No 

 notopodial chatre can be seen. The notopodial cirrus of the second 

 segment is well developed, springing from the dorso-lateral surface and 

 falling inwards and backwards to meet its fellow of the opposite side, 

 constituting with the latter the first of the pairs of gills with which the 

 dorsal surface of the worm is furnished. 



In the third segment the neuropodium consists of a very small, 

 pointed lobe, from below and behind which a few short, flattened chretie 

 spring. There is no neuropodial cirrus. The notopodium consists of a 

 broad, flattened, fin-like process, with a small secondary lobe or cirrus 

 attached to the posterior angle of its dorsal surface, and provided with 

 a row of strong, broad, flattened cluetw (paleas) of a bright yellow 

 colour. The notopodial cirrus forms a gill like that of the second 

 segment, though slightly larger. 



The fourth, fifth, and sixth segments are very similar in character to the 

 third, and all have broad, strong chietie in the neuropodia. These chtetie 

 occur, therefore, in four segments and not in three as in Sahe/lario. 



In the seventh segment the parapodia take on the form which persists 

 generally throughout the abdomen. This region comprises about forty 

 segments, of which the last few are rudimentary, and on which the 

 dorsal cirri (gills) persist only in the first fifteen or sixteen. Tlie noto- 

 podia on all the segments have the form of flattened, fin-like processes, 

 each bearing along its external margin a closely packed row of uncini. 

 These uncini (Fig. G) have eight teeth, of which the first is only slightly 

 developed. The middle teeth are the longest. Two long, tendon- 

 like filaments are attached to the lower end of each uncinus, and one 



* Allen, E. J., "The Anatomy of Pcecilochietus," Quart. Joitrn. Micr. Sci., vol. .\lviii. 

 p. 79. t On one side of tlie specimen examined this lobe is bifid. 



