Betragtning syntes den at maatte være en distinkt Art ; 

 Skallets Diameter 54""", dets Hoide 31""", Mundaabningen 

 14""", de længste Pigge 25""". Men naar man sammenhol- 

 der disse store Exemplarer fra Storæggen og Vestfjorden 

 med Rækker af nedadstigende, mindre Exemplarer, saa 

 kommer man til en Størrelse, hvor Overgangen fra Sarss 

 Echinus rarispinus til den typiske Form synes noget tvivl- 

 som, med andre Ord, jeg har nemlig ikke fundet med Sik- 

 kerhed noget Overgangsstadium. Er Echinus rarispinus 

 ikke en distinkt Art, saa er den under alle Omstændigheder 

 en udpræget Varietet, der synes at arbeide sig op til en 

 selvstændig Art, forudsat at Diibens og Korens Art virkelig 

 er typisk. Men gaar man ud Ira, at Sars's Echinus rari- 

 spinus er den virkelige typiske Art, saa maa Diibens og 

 Korens Art betragtes som en dvergagtig Afart, der under 

 sit indesluttede Fjordliv er degenereret. 



2. Echinus Flemingii, Forbes, Husøen, Sognefjord. 100 



Favne, flere store Exemplarer. 



3. Echinus esculentus,, Linné, Husøen, 1 Exemplar. 



— Station 23, nogle Exemplarer. 



— — 149. et mindre og et meget 

 lidet Exemplar. 



Station 173 — 74, meget smaa Exem- 

 ] >larer. 



4. Echinus élegans, Diib. et Kor. Station 8, et stort og 



et lidet Exemplar. 

 — Station 9, et lidet Exemplar. 



— — 25, et lidet Exemplar. 



— — — 79, et lidet Exemplar. 



— 101, et lidet Exemplar. 



5. Strongyhcentrotus Drobachiensis (Muller), Brandt, Station 



48, flere smaa Exemplarer. 



— Rost, Lofoten, 3 — 5 Favne, 

 mange, men smaa Exempl. 



— — Station 173, et Par smaa 



Exemplarer. 



Station 224, mange store 



Exemplarer. 



Station 237, mange, men 



smaa Exemplarer. 



— — Station Saltstrømmen (Lofo- 



ten) 90 Favne, i stor Mængde 

 og i mange Farvevarieteter. 



— Station 257, flere Exemplarer. 



— Station 280, mange Exempl. 



— — Station 315, et Exemplar. 



— — 322, et Exemplar. 



— — 336, nogle Exempl., 

 varierende baade i Størrelse 

 og Farve. 



Station 357. et Exemplar. 



declared by Professor Gr. O. Sårs to be his Echinus rari- 

 spinus, and on the first observation it seemed as if it were 

 a distinct species; diameter of the shell 54™"', the height 

 31"""; the oral aperture 14'""': the longest spines 25""". 

 But when we compare these large specimens from Stor- 

 æggen aud Vestfiord, with series of diniinishing, smaller 

 specimens, we then arrive at a size where the transition 

 from Sars's Echinus rarispinus to the typieal form- appears 

 somewhat doubtful; in other words, I have not, with cer- 

 tainty, found any transition stage. If Echinus rarispinus 

 is not a distinct species, it is, in any case, a distinguished 

 variety that appears to work itself up to an independent 

 species, provided that Diiben and KoreiVs species really is 

 typieal. But if we take it for granted that Sars's Echinus 

 rarispinus is the genuine typieal species, then Diib. and Ko- 

 rene species must be regarded as a dwarfish variety which, 

 under its confined life in the fiords, has degencrated. 



2. Echinus Flemingii, Forbes. Husoen, Sognefiord. 100 



fathoms. Several large specimens. 



3. Echinus esculentus, Linné. Husoen. 1 speciruen. 



— — Station 23. A few specimens. 



— — — 149. A smallish and a very 



small specimen. 

 -^ — Stations 173, 174. Very small speci- 



mens, 



4. Echinus elegans, Diib. et Kor. Station 8. A large and 



a small specimen. 



— — Station 9. A small specimen. 



— — — 25. A small specimen. 



— — — 79. A small specimen. 



— 101. A small specimen. 



5. Strongylocentrotus Drobachiensis (Miiller). Brandt. Stat- 



ion 48. Several small speci- 

 mens. 



Røst. Lofoten ; 3 — 5 fathoms. 

 Mauy, but small specimens. 

 Station 173. A couple of 

 small specimens. 

 _ Station 224. 



specimens. 



— Station 237. Many, 

 small specimens. 



— — Station, Saltstrommen (Lofo- 



ten), 90 fathoms. Great 

 quantities, and in many var- 

 ieties of colour. 

 Station 257. Several speci- 

 mens. 



Many large 



but 



Many speci- 



One specimen. 



One specimen. 



A few speci- 

 mens, differing both in size 

 and colour. 

 Station 357. One specimen. 



Station 280. 

 mens. 



Station 315. 



— 322. 



— 336. 



