308 PROCLYMENE MULLERL 



1882.? Praxillella Miilleri, Vei-rill. Trans. Connect. Acad. Arts Sc, vol. iv, pt. 2, p. 295. 



1883. Glymene „ Levinsen. Yidensk. Meddel. Nat. For., p. 144. 



1894. „ „ Bidenkap. Christ. Yid.-Selsk. Forhandl., p. 114. 



1897. ,, „ Micliaelsen. Polych. deutsch. Meere, p. 142. 



1906. Proclymene „ Arwidsson. Skand. u. arktiscli. Maldan., p. 129, Taf. iii, figs. 91 — 97; 



Taf . viii, figs. 273—275 • Taf. xi, fig. 350. 

 1913. „ „ Mcintosh. Ann. Nat. Hist., ser. 8, vol. xi, p. 90. 



Habitat. — Dredged in 78 fathoms off the Outer Skerries, Shetland, in 1868, by 

 Dr. Grwyn Jeffreys. Coast of Northumberland (Prof. Gr. S. Brady), 1863. 



Abroad it extends to Norway (Malmgren) ; Finmark ; Labrador (Verrill) ; Sweden 

 (Malm, Arwidsson.) 



Head (Plate XCIX, figs. 2, 2 a — 2 /;) distinguished from that of Praxillella by the 

 narrow rim of the cephalic plate, thus making the anterior process and the keel prominent. 

 The cephalic plate slopes from behind forward and downward, terminating anteriorly 

 in the median process which is as prominent as in P. prsetermissa, but instead of being 

 bounded by the fissure between it and the cephalic rim it is continuous at its base with 

 an accessory fold on each, side, within which the anterior curve of the nuchal organ is 

 situated. Arwidsson 1 makes no differentiation of the base of the anterior process, so that 

 something depends on the preparation if variation does not occur. From the median 

 process a short and narrow keel extends backward, but it does not reach the middle of the 

 cephalic plate. On each side of the keel is the short though deep nuchal groove, which 

 terminates anteriorly by curving outward and being lost behind the accessor}^ fold on 

 each side of the central process. The rest of the surface of the cephalic plate is smooth. 

 The margin of the slightly hollowed cephalic plate is comparatively thick and little raised, 

 and though slightly crenate it has no distinct notch. Yet in the preparation a shallow" 

 groove runs from one of the crenations in the mid-lateral region, and also extends to the 

 first bristled segment. 



The fused prostomial and peristomial region is narrow dor sally but wide ventrally, 

 and has the mouth as a somewhat triradiate opening beneath the median process which 

 is grooved by the anterior depression from the mouth. The posterior lip is transverse 

 and prominent. The proboscis is wrinkled, but the surface appears to be smooth. 



The body is rounded dorsally, slightly flattened ventrally, and marked by a ventral 

 streak. Arwidsson gives 165 mm. as his longest example. The largest British specimen 

 is imperfect (eleven anterior bristled segments) and it measures 70 mm. It would thus 

 not be far behind Arwidsson's example. 



The characteristic funnel (Plate XCIX, fig. 2 c) was dredged by Dr. Gwyn Jeffreys 

 ten miles off Balta in 60 fathoms in 1868. It had been severed close to the base, no trace 

 of the adjoining tissues remaining. Twenty-eight of the shorter, flattened conical cirri, 

 which are flexible and comparatively large, occur on the margin, a slightly convex portion 

 accompanying the rim between the two longer on each side of the mid-ventral line. Each 

 of these longer forms has a larger flattened base than the ordinary cirri, then the tip is 

 filiform with a probe-point. Fine lines radiate from the central anal opening, but they 

 are much more numerous than the notches between the cirri. A slight ridge passes from 



1 ' Skandin. u. arktiscli. Maldan./ Taf. iii ; fig. 93. 



