85 



Forekomst og Udbredniug. At den her omhandlede 

 meget distincte Art blev under Expeditionens sidste Tout 

 en Del Exemplarer optagne fra et Dyb ai' 190 Favne om- 

 trent midt imellem Beeren Eiland og Finmarken (Stat. 290). 

 Ved nylig at gjennemgaa det paa mine forskjellige Reiser 

 Lndsamlede Materiale af Tanaider. rinder jeg ogsaa et Par 

 Exemplarer af samme Art fra vor nordlige Kyst { Hammer- 

 fest). 



Dens for Tiden bekjendte Udbredning synes saaledes- 

 at indskrænke sip- til Havet omkring Norges nordlige Kyster 

 og Beeren Eiland. 



Trib. 2. Flabellifera. 



Bemærkninger. Under denne Tribus henforer jeg 

 alle dr Isopoder, hos hvem de bagerste Par Buglemmer 

 sammen med sidste Segment danner en mere dier mindre 

 tydelig Halevifte. Jeg har fundet. at disse Former ogsaa 

 i tiere andre Henseender frembyder Overensstemmelser ind- 

 byrdes, og derfor fortjener at sammenfattes som en særegen 

 storre Afdeling af Isopoderne. Folgende Familier horer 

 herhen: Anthuridæ, Anceidæ. Cymothoidæ (incl. Ægidæ & 

 Cirolanidæ), Serolidæ. Sphæromidæ (incl. Limnoriidæ). 



Fam. Anceidæ. 



Gen. Ancens*, Risso, 1816. 

 Crustacés de Nice. 



17. Anceus stygius. Gl. 0. Sus. 



(Pl VIII. Fisr. 1—22). 

 Anceus stygius, <J. 0. Sårs, Prodromus desciptionis ('rust. etc, X". Ho. 



Artscharacteristik. <? Legemet a f anans Form. 3 

 (Tange længere end bredt, fortil noget afsmalnende. med 

 særdeles haarde, piggede Integnmenter. Hovedet mindre 

 end sædvanligt, næsten pentagonalt. til bver Side forsynet 

 med en i Midten afbrudt tandet Kjøl. De frie Forkrops- 

 segmenter med grovt tandede Epimerer; de bagre Side- 

 hjørner paa de 3 sidste udtrukne til skjævt udadrettede 

 smale tandede Fortsatser; næstsidste Segment størst, oventil 



Oceurrence and Distribution. — Of the very dis- 

 tinctly characterized species described above, a number of 

 specimens were tåken, on the last cruise of the Expedition, 

 at a depth of 190 fathoms, about midway bétween Beeren 

 Eiland and Finmark (Stat. 290). Lately, on reviewing the 

 material comprising the Tanaid group collected on my various 

 exploratory excursions, I lighted on a few specimens of the 

 species trom the north coast of the country (Hammerfest). 



The distribution of this form is therefore. apparently, 

 at present confined to tlie sea off the northera shores ul' 

 Norway and that surrounding Beeren Eiland. 



Trib. -2. Flabellifera. 



Remarks, — To this tribe I reier all Isopods in 

 which the posterior pair of abdominal limhs. along with the 

 last segment, constitnte a more or less distinct caudal fan. 

 I have found that the said forms also presenl agreement 

 in several other respects, and hence afford warrantable 

 grounds for classing them in a special. comprehensive section 

 of the Iso])ods. The following families belong to this sec- 

 tion: - The Anthuridæ, Anceidæ, Cymothoidæ (including 

 the Ægidæ and the CirolanidæJ, Serolidæ, Sphæromidæ 

 (including the Limnoriidæ). 



Fam. Anceidæ. 



(len. Anceus. Risso, 1816. 

 Crustacés de Xice. 



17. Anceus stygius, G-. 0. Sårs. 



(Pl. VIII. figs. 1—22). 

 Inceui i gins, ii 0. Sårs. Prodromus descriptionis < No. 65. 



Specific Character. — rf Body oblong in form. ."> 

 times longer fchan broad, forward somewhat tapering, with 

 exceedingly hard. s]riky integuments. Cephalic segment 

 smaller than usual. almost pentagonal. furnished on either 

 side with a dentate keel, disrupted in the middle. Free 

 se.ements of anterior division with coarsely dentate epimera; 

 posterior lateral corners on last •'! drawn out to oblique, 

 exteriorlv directed. slender. toothed projections; penultimate 



