2G Prof. "M'Tntosli's Noffsfrovi the 



tuft (tliird) a f;iii)t roddisli l)clt, apparently from a l)loo(l- 

 vesscl, occurs. The next scgineiit-iunction has a l)clt of red 

 on each side of it, apparently of reddish pignuMit, the specks 

 of whicli pass a short way on the following segment (fifth 

 bristled), which has its hristlc-tnft about the middle. Theu 

 there is a slight constriction of tlie body-wall, at wliieh a 

 broad red belt occurs, a bristlc-tuft (sixth) being placed just 

 in front of another red l)elt which passes all round the body. 

 The next bristle-tuft (seventh) is in front of a furrow 

 marking another segment, the anterior third of which has 

 the broadest band of red yet met with in front. This is 

 followed by a pale region ending at the next bristlc-tuft 

 (eighth), and concluding the sp>"cially differentiated region 

 anteriorly, the seventh and eighth tufts being separated by a 

 long interval. 



The next segment and half of the following are coloured 

 except at the margins by a longitudinal belt of red, appa- 

 rently along the intestine, probaljly from an intestinal sinus, 

 and thereafter the reddish hue is due to the longitudinal and 

 circular vessels, especially those of the gut, the tip of the 

 tail and its cirri being pale. In these examples the majority 

 of the short anal cirri had processes at the tip, as Arwidsson 

 shows in his figure '^^ and describes as ""'short, finger-liko 

 lobes," some being only bifid, others trifid or quadrifid, 

 whilst each of the processes in a bifid form may have two or 

 more minor papillfe at the tip. Occasionally the cirrus ends 

 in a bluntly conical apex with a minute papilla at each side 

 near the ajiex. The gut itself is yellowish or pale orange. 

 The proboscis, which is constantly protruded by the animal, 

 when removed from its tube shows a tinge of red from a 

 blood-vessel along the middle, and its distal region appears 

 to be smooth. 



In Petaloproctus terricofa, De Quatrefages, another addi- 

 tion, the head is fused with the buccal segment and without 

 a marginal ridge. Body about 18 cm. long, 2-3 mm. broad, 

 and of twenty-four segments, twenty-two of which arc seti- 

 gerous. First segment distinctly separated from the buccal. 

 First three segments have no ventral division. In the 

 others there are two ventral tori, each with about forty 

 crotchets. Dorsal bristles strong, yellow, and winged, and 

 others colourless, not winged, spinous. Behind the sixth or 

 seventh segment are capillary bristles, sinuous and long 

 (overlooked by Claparede and Grube) with minute spines. 

 In seven or eight posterior segments in front of the anal, 



* Proceed. Hoy IrisL Acad. vol. xxix. no. 0, \t. 219. 



