36 



Artskarakter. 



Fodskiven meget udvidet, med en tyk. lappet Raml. 

 Underfladen ujævn, tildels formet efter Gjenstanden, hvor- 

 paa den sidder, og belagt med en chitinagtig Masse. 

 Kolumnen 20 — 25""" hoi, cylindrisk. noget indkneben paa 

 Midten, med en glat. perlemorglindsende Overflade og en 

 afrundet øverste Raml. tier kan trækkes over Mundskiven. 

 Denne er rund, lidt hvælvet med tine Folder udstraalende 

 fra Munden, der er aflang med foldede Læber og to Goni- 

 diefurer. 3 Rækker retraktile, temmelig korte Tentakler 

 med en rund Aabning i Spidsen; 18 i inderste og mel- 

 lemste Række, 18 — 20 i yderste Række. Farven: Kroppen 

 bleg rosenrød, men stærkt iriserende; den øverste Raml 

 noget mørkere. Mundskiven rosenrød, spillende i det Gule. 

 Omkring Munden en høirød Ring. hvorfra udstraale høi- 

 røde Striber til Tentaklerne. Disse høirødé. 



Jeg har henført denne Art til Slægten Sagartia, 

 uagtet den har 8 Par fuldstændige Septa; men da de 6 

 Par ere golde og maa ansees for principale, og forresten 

 hele Organisationen er overensstemmende med det Karak 

 teristiske for Slægten Sagartia. har jeg ikke fundet det 

 rigtigt eller nødvendigt at drage den bort fra denne. 



Calliactis Krøyeri. n. sp. 



Tab. [I, Fig. 2. Tal... VIII. Fig. (i, 13, 14. 



Fodskiven paa ganske unge Exemplarer er rund, 

 men paa voxne Dyr meget irregulær aflang, omfattende 

 næsten ganske Conehylien af Fusus Krøyeri, saa at paa 

 flere Exemplarer kun Aabningen og en liden Del af Spiret 

 er ubedækket, Tab. II. Fig. 2, imedens paa andre ogsaa 

 Spiret er omsluttet, og da er kun Aabningen fri. Tab. VIII, 

 Fig. 13, saa at den iboende Fusus kan trække sig 

 frit ud og ind og spasere med stor Lethed omkring, 

 dragende paa Actinien. Fodskivens Rand ei- temmelig 

 tynd og unduleret, og paa dens Underflade, der er over- 

 maade konkav og har antaget Formen af Conehylien. er 

 afsat en brun. chitinagtig Membran, som binder Fe ulen til 

 denne. 



Kroppen er næsten dobbelt saa hoi som tyk (omkring 

 100"""), cylinderformet, men ikke lige tyk overalt. Ved 

 Fodskiven er den smalest, udvider sig paa Midten og bliver 

 buget; hengere op aftager den noget i Tykkelse for atter 

 at udvide sig mod Mundskiven. Tab. II. Fig. 2. Under 

 Dyrets Kontraktioner antager Kroppen forresten forskjel- 

 lige Former; men er det i fuld Vigør, antager det altid 

 den for omtalte Urneform, hvorunder det er afbildet. 

 Kolumnens Overflade er glat. forsynet med brede, svagt 

 ophøiede Længdefolder, paa hvilke sees. især paa den 



Speeiflc characteristies. 



The pedal disc mueh expanded. has a thick, lobate 

 margin. The under-surface uneven, partly formed according 

 to the object upon which it is seated. and coated with a 

 chitinous mass. The column 20—25""" in height. cylin- 

 drical. somewhat constricted at the middle; its surface 

 smooth. with a mother-of-pearl Iustre, has a rounded 

 uppermost margin which can be drawn over the oral disc. 

 The oral disc round, somewhat arcuate, has fine folds 

 radiating from the mouth; the latter oblong, with folded 

 labiæ and two grooves. Three series of retractile, rather 

 short tentacles, with a round orifice at the point; 18 ten- 

 tacles in the innermost and intermediate series, 18 — 20 

 tentacles in the outermost series. The colour. The body 

 pale rose-red, lurt strongly irridescent. The uppermost 

 margin somewhat darker. The oral disc rose-red. shading 

 to yellow. Round the mouth a bright-red annulus from 

 which bright-red stripes radiate to the tentacles. The 

 tentacles bright-red. 



I have assigned this species to the genus Sagartia 

 although it has 8 pairs of perfect septa. hut as the (i pairs 

 are sterile and must be considered to be principal ones, and 

 as the entire organisation, otherwise, accords with that 

 characteristic of the genus Sagartia, I have not found 

 it right, or necessary, to withdraw it from that genus. 



Calliactis Krøyeri. a. sp. 

 PL II. Fig. 2. Pi. VIII, fig. ii. 13, it. 



The pedal disc is, in young specimens, round. 1 mt in 

 adult animals verv irregularly oblong, and almost completely 

 embraces the shell of Fusus Krøyeri so that, in many 

 specimens. only the aperture and a small part of the spire 

 are lett exposed (Pl. Il, fig. 2). while in others the spire 

 is also enclosed, and then only the aperture is free 

 (Pl. VIII, fig. 13), tims permitting the resident Fusus to 

 freely project and retract itself, and to perambulate with 

 great ea.se. carrying the aetinia with it. The margin of the 

 pedal disc is rather thin and undulating, and on its under- 

 surface, which is exceedingly concave and has assumed 

 the form of the shell. there is deposited a brown chitinous 

 membrane which secures the base to the mollusc. 



The body is almost twice as high as it is thick (about 



100' ). cylindrical, but not uniformly thick in all parts. It 



is narrowest at the pedal disc. becomes wider at the middle 

 and bulges out; a little farther up it diminishes somewhat 

 in thickness, and again increases in thickness towards the 

 oral dise (Pl. II. fig. 2). During the animals contractions, 

 the body assumes, however, various forms but, when in full 

 vigour, it always assumes the urn-shape previously men- 

 tioned, and in which shape it is illustrated. The surface of 

 the column is smooth. furnished with broad. faintlv elevated 



