246 LAONOME KROYERI. 



as a narrow belt split by the ventral furrow. Bristles of two kinds anteriorly, with Ion* 

 slender shafts and tapering winged tips, and others with broad wings and short tapering 

 ends. Posteriorly only bristles with broad wings and tapering tips. Anterior hooks with 

 a high crown, a moderate main fang and six or seven distinct teeth above it, the prow 

 very large and prominent, the posterior outline straight and a short rudiment of a posterior 

 basal process. The posterior hooks have the same high crowns and general shape, but 

 are devoid of the basal process posteriorly. Tube of secretion and mud. 



Synonyms. 

 1865. Laonome Kroyeri, Malmgren. Nordiska Hafs.- Annul., p. 400, Tab. xxvii, fig. 85. 

 1867. „ „ idem. Annul. Polych., p. 113. 



1887. „ „ Cunningham and Ramage. Trans. Roy. Soc. Edin., vol. xxxiii, p. 669. 



I 889 - „ „ Marenzeller. Arch. f. Naturges., lv, p. 132. 



1913 - » » Hofsommer. Wiss. Meeres. Komm. deutsch., Bd. xv, p. 324, Taf. iv, 



figs. 3_5. 



19 14. „ „ Southern. Proc. Roy. Irish Acad., vol. xxxi, No. 47, p. 139. 



1916- „ „ Mcintosh. Ann. Nat. Hist., ser. 8, vol. xvi, p. 15. 



Habitat— Inishlyre Harbour, Clew Bay, single example (Southern) ; Firth of Forth 

 (Cunningham and Ramage). 



Abroad it extends to Spitsbergen and the northern seas. 



The cephalic collar 1 is somewhat low, being deepest ventrally where the edges over- 

 lap at the fissure. In the median line dorsally the gap is both wide and depressed in 

 front, and the edges of the collar there are slightly reflected. The branchiae are short in 

 proportion to the length of the body and from fourteen to sixteen in number. The 

 filaments have a chordoid axis with narrow transverse septa, and terminate in a slender 

 tapering process. The pinnae are short at the base, increase in length till near the tip, 

 where they again diminish before reaching the base of the terminal filament. No pigment- 

 specks were visible in the spirit-preparation. Tentacles comparatively short, bluntly 

 tapered distally. The body is comparatively long and slender, and the example showed 

 little diminution throughout its length, having apparently been preserved in its tube and 

 then cut out. The segments are fairly distinct, those of the anterior region ranging from 

 eight to twelve (Malmgren). The ventral scutes of the region are distinct and undivided, 

 and there is a dorsal groove, behind which a line marks the mid-dorsal region for some 

 distance. The scutes are continued backward on the ventral surface as a somewhat 

 narrow pale band, the central groove cutting the portion in each segment into two. In 

 the preparation the bristles are inconspicuous. The anterior are of two kinds— a series 

 with slender elongate shafts and short tapering tips with narrow wings (Plate CXXIX, 

 fig. 3 a,), and a larger number with stouter shafts and paddle-like tips with broad wings 

 (Plate CXXIX, fig. 3 c) and a tapering process of the axis. The posterior bristles are of 

 one kind only, viz. those with narrow but distinct wings and long tapering tips 

 (Plate CXXIX, fig. 3 h). The anterior hooks (Plate CXXIX, fig. 3 d) are avicular with a 

 characteristic short and stout outline and a high crown, a main fang of moderate size and 

 six or seven distinct spikes in lateral view above it. The anterior prow is large and 

 1 I have to thank Mr. Southern for sending the single example for examination. 



