PSEUDOCLYMENE (ERSTEDI. 339 



cylindrical, composed of secretion with sand-grains, minute fragments of shells, and an 

 occasional Foraminifer ; whilst one or two are fixed to small pebbles. 



Synonyms. 

 1863. Clymene (Erstedi, Claparede. Beobacht. Wirbellosen Thiere, p. 28, pi. xiii, figs. 8 — 13. 



, ; ? „ digitata, Grrube. Arch. f. Naturges., p. 54, pi. v, fig. 5. 

 1894. „ (Erstedi, De St. Joseph. Ann. Sc. nat., 7 e ser., t. xvii, p. 137, pi. vi, fig. 166. 

 1906. Euclymene „ Arwidsson. Skand. n. arktisch. Maldan., p. 218. 

 1910. Clymene „ Elwes. Journ. M. B. A., vol. ix, p. 64. 

 1913. ? Pseudoclymene (Erstedi, Mcintosh. Ann. Nat. Hist., ser. 8, vol. xi, p. 92. 



Habitat. — Procured between tide-marks in sandy tubes under stones at Guernsey and 

 Herm, 1868 ; Torquay (Elwes). 



The same form was dredged in the ' Porcupine ' Expedition of 1870 in Bono Bay in 

 twenty-five fathoms. Adriatic (Grube) ; shores of France (De St. Joseph). 



The cephalic plate (Plate C, figs. 22 and 22 a) is somewhat like that of Praxillella, 

 with a conical median frontal process, slightly marked lateral notches, and median posterior 

 notch. The rim of the plate is moderately developed, and its outline is elliptical, more 

 elongated antero-posteriorly than any form hitherto observed in Britain, a feature partly 

 due to the continuation of the narrow anterior border into the median frontal process. 

 When the proboscis is included the surface is slightly convex, but when the organ is 

 extruded it is somewhat concave. The keel is long and well marked, commencing a little 

 in front of the posterior rim, and running forward to the base of the median process. The 

 nuchal grooves appear to go along the whole length of the keel, and to bend outward 

 anteriorly on each side of the median process. The arrangement thus differs from that 

 in Pseudoclymene, which has very short, nuchal grooves. The slightly-marked lateral and 

 median posterior notches of the rim, as well as the fusion of the outline of the median 

 frontal process with the narrow anterior end of the cephalic plate, distinguish it from 

 Praxillella. Eyes were present in the living form, but unfortunately they are now 

 invisible. The proboscis has the usual outline of a globular button on extrusion and is 

 smooth. 



The body is comparatively small, with a slight constriction anteriorly, and then 

 continues of a nearly uniform diameter to the posterior end. The first seven segments are 

 shorter than those which follow, and their feet are in front of the middle of the segment, 

 while those behind them have the feet toward the posterior border of the segment. The 

 last two bristled segments are shorter than those immediately in front, and behind them 

 are four segments devoid of bristles, viz. a short urn-shaped segment with glandular ridges 

 at the end, and three closely aggregated rings with traces of lateral glandular swellings 

 in two, the last bearing the funnel. The usual median ventral ridge runs from the 

 anterior to the posterior end, where it is opposite the longest cirrus, which is flattened 

 (Plate CI, fig. 9) and not much tapered. The long and the short cirri are arranged more 

 or less alternately, one or two of the short occurring between the long. In the centre is a 

 flattened anal cone with the anus in the middle. The number of cirri varies from seventeen 

 to twenty-three. 



The first three segments are spinigerous, and have, beside, the usual tuft of bristles. 



