SCOLECIFORMIA 



333 



these species are also found on the west side 

 of the Atlantic. Cly- 

 mene lumbricoides Qf". 

 is about 8 inches long : 

 pink, with a light ring 

 round each segment ; the 

 seventh segment is larger 

 and reddish-brown. The 

 prostominm is laterally 

 compressed. Anus on a 

 cone, which rises from 

 the bottom of a funnel, 

 the margin of which is 



terior end ; b, notopo- FAM. 3. AreniCO- 



dial and c, neuro- 7 . 7 TT -, 1 



podial chaetae; p, hda6. E.m belongs 



perianal funnel. (From the CO mm Oil " lug- 



Malmgren.) . . , 



worm Aremcola marina 

 L., which occurs all round our coasts between 

 tide-marks, and is so generally used as bait 

 in fishing. The worm, which measures 5 to 8 

 inches, is of a dark tint, usually brownish- 

 green. It burrows to a depth of some 18 

 inches or 2 feet, and throws up a consider- 

 able quantity of " castings " or " sand-ropes," 

 which are noticeable on every shore consist- 

 ing of mud or muddy sand. The body of 

 the worm is cylindrical, thicker anteriorly ; 

 the segments are indistinct, owing to the 

 secondary groovings and furrows on the skin. 

 The prostomium is in the adult fused with 

 the peristomium ; this and the second seg- 

 ment are achaetous. Then follow twenty 

 chaetigerous segments with dorsal bundles of 

 capillary chaetae and ventral rows of short 

 crotchets. The hinder region of the body 

 is achaetous and narrower than the rest, 

 forming a " tail." There are twelve (some- 

 times thirteen) pairs of arborescent red gills 

 on segments 9 to 20 (21). Internally there are 



2SI 



Fig. 180. Arenicola met* 

 rina. x 1. Dorsal 

 view. The anterior end 

 is seen partly from the 

 side. ///, The first 

 chaetigerous segment ; 

 ZX, the ninth chaeti- 

 gerous, and first 

 branchial segment ; 

 A' AT, the last bran- 

 chial segment ; b, 

 notopodial and c, 

 neuropodial chaetae ; 

 g', g, the first and last 

 gills ; t, the non-chae- 

 tigerous tail. 



