262 



MR. ¥. E. BEDDARD ON ANNELIDS 



of various sizes, of the tubes of the worm ; these are of consider- 

 able thickness, the greater portion being formed by a coating of 

 fine mud and sand, in which is imbedded a quantity of entire and 

 broken shells of various kinds ; the part of the tube fabricated by 

 the animal itself is thin, and of a tough, somewhat cartilaginous 

 consistency. The colour of both specimens is a pale brown, the 

 branchiae being somewhat darker, but still of a uniform brown 

 tint. The anterior region of the buccal segment (fig. 4) is 

 marked by a broad black band, and the two halves of the collar 

 where they meet in the median ventral line (fig. 5) are similarly 

 pigmented. 



The collar, instead of being confined to the first segment, 

 passes obliquely downwards, and terminates on the third seta- 

 bearing segment ; on all the segments the collar is situated on 

 the dorsal side of the parapodiaand close to them. The relations 

 of the collar can be seen by an inspection of figs. 4 and 5. 



The " thorax " contains eight segments, which are distinguished 

 from the abdominal segments by the much larger size of the tori 

 unciniqeri. The middle ventral line of each of the thoracic seg- 

 ments is marked by a thickened lighter-coloured area, which 

 extends over the greater part of the ventral surface ; this area 

 gets smaller in the posterior segments, and in the abdominal 

 region is bisected by the ventral groove. The latter occupies the 

 median ventral line up to the eleventh segment ; on the tenth 

 segment it is bent towards the right side, and, after crossing 

 between the eighth and ninth, reaches the dorsal median line at 

 the sixth segment. On the dorsal side of the body this groove 

 runs at the bottom of a rather deep depression which marks 

 these segments. 



The setae of the dorsal tori uncinigeri are of two kinds, as in 

 other species of this genus, and show no peculiarities in their 

 shape They are stout seta) with a double curvature at the 

 extremity, which becomes gradually attenuated towards the tip. 

 These parapodia also bear rounded mamillary processes, possibly 

 of a sensory nature, which appear to resemble those figured by 

 Claparede in Trophonia eruca*. I do not find any such process 

 on the corresponding region of the parapodium in the abdo- 

 men, although the surface is irregularly divided into rounded 

 prominences. 



* "Amplifies ch6topodcs du Golfc do Naples,' M6ni. Soe. Fhys. Gen. t. xx. 

 pi. xxv. fig. 2. 



