294 DR J. H. ASHWORTH 



There are 43 chsetiferous segments, the last of which is small and evidently 

 recently formed ; this is succeeded by the anal segment or pygidium (fig. 5). 



The first chretiferous segment is narrow mid-dorsally, wider at the sides, i.e. 

 where the parapodia are borne, and enlarged mid-ventrally, just behind the mouth, 

 to form a well-marked " under-lip," the front margin of which is lobate about six 

 lobes being indicated (fig. 2). This segment consists of two annuli, the anterior of 

 which is much the larger and bears the parapodia. 



The second chsetiferous segment (figs. 1,2) is tri-aunulate, there being a 

 small ring in front of and another behind the chtetiferous annulus. These smaller 

 rings are visible on the dorsal and ventral aspects, but are not seen in the lateral 

 view of the worm. 



The third chsetiferous segment has a similar constitution, but the fourth is 

 composed of four rings the chsetiferous annulus together with two rings in front 

 and one behind. All the succeeding segments up to and including the 41st are 

 also four-ringed ; the auuulation is much less clear in the next segment, and the 

 43rd segment is a single narrow ring bearing very small parapodia. 



In the fifth and succeeding chsetiferous segments the annuli are subdivided on 

 the dorsal surface * by antero-posterior furrows, so that the skin is marked out into 

 more or less quadrangular areas, as is the case in other Scalibregmidse. This 

 sculpturing f the skin is well marked up to about the 23rd segment, but in the 

 following segments is exhibited only by the chsetiferous annuli. 



The anal segment or pygidium is a short ring on which ventrally there are two 

 slight enlargements (one on each side of the middle line), of which the left bears a 

 slender cirrus about '5 mm. in length (fig. 5). Other cirri have been lost ; it is not 

 possible to say with certainty how many, but probably the original number was four. 



There is no trace of gills in this specimen. 



Parapodia. 



The notopodia and neuropodia of the first segment are little elevated above 

 the general surface, but in the following segments there is right and left a prominent 

 elevation extending over the whole lateral region of the segment from each of which 

 the notopodium and neuropodium arise. From about the seventh segment onwards 

 the raised area presents papilliform elevations the epidermis of which is glandular. 

 There is usually one of these papillse anterior and another posterior to the lip of each 

 di;etal sac, that just behind the lip of the chsetal sac being especially well marked, 

 forming in most of the segments a prominent, rounded knob. 



A cirrus is present on the posterior face of the 18th left neuropodium, and on all 

 the succeeding neuropodia up to and including the 40th. Cirri were probably 

 originally present also on the, 41st and 42nd segments, the parapodia of which are 



' Tins subdivision of Lliu annuli is IVelily marked on the ventral surface. 

 (ROY. soc. EDIN. TUANS., VOL. L, 40(i.) 



