26 



Denne Polynoe har megen Lighed med Eunoe Oer- 

 stedi, Malmgren, og Eunoe nodosa. M. Sårs. men skiller sig 

 fra begge derved, at Hovedets tynde Tilliæng ere ucilierede 

 og ved Skællenes Form. idet ogsaa første Par Skæl ere 

 nyreformigt aflange, samt ved Skællenes Bygning. 



Polynoe semisculpta, Johnston (?). 



Reykjavik. 



Da jeg ikke er ganske sikker paa Diagnosen hidsætter 

 jeg en Beskrivelse af Dyret. 



40 Led. 15 Par Elytrer. de bagerste Led ubedæk- 

 kede. Hovedlappen ligesaa bred som lang. Bagre Par 

 Øine paa Issen, forreste Par midt paa ydre Rand. Pal- 

 perne ligesom Tentakelen og Tentakelcirrerne omtrent 2'/ 2 

 Gange saa lange som Hovedet, Antennerne l / 2 Gang saa 

 lange som Palperne (Tab. III. Fig. 16). Tentakel. Anten- 

 ner og Tentakelcirrer ere ligesom Dorsalcirreme tæt cilie- 

 rede. Fodderne. delte i to omtrent lige lange Børsteknu- 

 der, med en kort Ventralcirre (Tab. III, Fig. 17). De 

 dorsale Børster kun lidt mere end halvt saa lange som de 

 ventrale. lidt tykkere end disse, samt lint tværtandéde. De 

 ventrale Børster med todelt Spids og meget grovere tvær- 

 tandéde (Tab. III. Fig. 18). Elytrerne for det blotte Øie 

 glatte med endel sniaa. mørke, aflange Kunder langs bagre 

 Rand; første Par runde, de derpaa følgende nyreformige, 

 deretter aflange. og de bagerste ægformige med deu længste 

 Axe rettet forfra bagtil. Under Mikroskopet vise Skællene 

 over hele Fladeu undtagen fortil og indad en Besætning af 

 smaa i Spidsen todelte haarde Knuder (Tab. III, Fig. 19 

 og 20). De større Papiller i Randen ere kølleformige og 

 sidde paa en blød Stilk (Fig. 20). Langs ydre Rand sta ar 

 der tæt, langs bagre Rand sparsomt Oilier. Farven er paa 

 Skællene brun, Hovedet farveløst. Tilhængene brune, Ryg- 

 gen farveløs. 



iugly dense and minutely serrate (Pl. I, tigs. 20. 21). The 

 colour of the scales is brown in the middle of the posterior 

 portion ol' the surface, changing to light-yellow along the 

 sides. The body itself colourless.. On the dorsal cirri and 

 the delicate appendages of the head a brown band below 

 the points. 



This Polynoe bears a close resemblance to Eunoe Oer- 

 sted!. Malmgren, and to Eunoe nodosa, M. Sars, but differs 

 from both in not having the delicate appendages to the head 

 ciliated, — also in the form of the scales (the first pair beiug 

 like the rest ovato-reniforin) and in their general structure. 



Polynoe semisculpta, Johnston (?)'. 

 Reykjavik. 



As it is not quite clear from the diagnosis whether 

 this Annelid be strictly identical with Johnston's species, 

 I will briefly describe it. 



Forty segments. 15 pairs "t' elytra': the posterior seg- 

 ments naked. The lobe of the head as broad as long. 

 The posterior pair of eyes on the crown, the anterior pair 

 in the middle of the outer margin. The length of the 

 palps, the tentacles, and the tentacular cirri is to that of 

 the head about as 2 1 ._. to I; the antennæ half as long as 

 the palps (PI. III. tig. 10). The tentacles, the antennæ, 

 and the tentacular cirri are. like the dorsal cirri, densely 

 ciliated. The feet, divided into two bristle-bearing protu- 

 berances, about equal in length, with a. short ventral cirrus 

 (PI. III. fig. 17). The dorsal bristles but little more than 

 half as long as the ventral, a trifle thicker, and trans- 

 versely serrulate. The ventral bristles with bipartite points, 

 and much more coarsely serrate (PI. HI, fig. 18). The 

 elytræ, to the naked eye, smooth, and studded with a num- 

 ber of dark minute oblong nodules along the posterior 

 margin: the first pair round, the remaining pairs succes- 

 sively reniform. oblong, and — those farthest behind — 

 ovate, with their longitudinal axis parallel to the line of 

 the body. Under a magnifier, the whole surface of the 

 scales, saving the anterior portion, is found to be studded 

 with minute nodules, cleft at the points (PI. Ill, figs. 19, 

 2<M. The large papillæ on the margin are claviform, and 

 affixed to a soft stem (PI. Ill, fig. 20). Both the outer 

 and the posterior margin are furnished with cilia, the for- 

 mer densely, the latter sparingly. Scales brown; head 

 colourless: appendages brown; back colourless. 



