14 



Biet: rosenrød. Fodens Rand gulrød; omkring Munden en 

 gulrød Ring. Tentaklerne lidt mørkere rosenrøde end Fod- 

 skiven og Kroppen. 



Familie Sideractidæ, mihi. 



Actinaria med mange fuldstændige Septa. Faa Ræk- 

 ker korte, ikke retraktile Tentakler, hvoraf den inderste 

 Række har 8. Mesodermale Cirkulærmuskler. 



Sideractis glacialis. q. g. et sp. 



Tab. I. Fig. 1 ; Tab. VII, Fig. ln. 12. 



Jeg har fundet det nødvendigt at grunde en ny Fa- 

 milie for den Aetinie. jeg nu er ifærd med at beskrive. 

 I enkelte Henseender nærmer den sin vistnok til Slægten 

 Bolocera, Gosse, som er underordnet Familien Bunodidæ; 

 men den adskiller sitr dog saa væsentlig fra denne, at den 

 ikke godt kan henføres dertil. 



Fodskiven er rund. tynd. membranøs, halv gjennem- 

 sigtig, henved 20""" i Gjennemsnit med en undulerende Rand. 

 Fra denne udgaa paa Underfladen radiære Linier henimod 

 Midten, hvilke angive Insertionerne af Septa. 



Kolumnen er yderst lav. knap r>""" hoi. og nogel 

 smalere end Fodskiven. Dens Væg er tynd 02: saa gjen- 

 nemsigtig, at Svælgrør, Septa og Mesenterialfilamenter 

 kunne sees. og paa den udvendige Flade iagttages 16 fine 

 Længdelinier, Insertioner af Septa. samt smaa, runde, hvide 

 Papiller, der staa temmelig tret. men uregelmæssigt. 



Mundskiven er noget bredere end den øverste Rand 

 af Kroppen; men ikke fuldt saa bred som Fodskiven. Den 

 er lidt hvælvet, har lignende hvide Papiller som Kroppen 

 og paa Midten en aflang Mund med 8 koniske, hule Lap- 

 per, hvoraf 2 danne Mundvigene (Gonidiegruber), der fore 

 neit til Svælggruberne, og de øvrige danne Læberne, nemlig 

 3 paa hverLæbe, Tab. I. Fig. 1; Tab. VII. Fig. 12. Fra 

 Mumien udgaa straaleformigt henimod Skivens Rand l(i 

 Linier. 2 fra hver Mundlap. hvilke antyde Septainsertion- 

 erne. 



Tentaklerne ere ikke retraktile og danne 3 Rekker; 

 de ere korte, tykke, konisk tilspidsede og synes at have en 

 Aabning paa deres yderste Ende, Tab. I. Fig. 1. Tal). VII. 

 Fig. 12. I den inderste Række, der er stillet lidt ind paa 

 Skiven, er der 8 Tentakler; disse ere storst. baade tykkest 

 og længst. lmellem dem og lidt udenfor dem, nærmere 



retractile tentacles, 24 in each; those in the inner series 

 are the longest. and those in the outer series are seated 011 

 the upperinost margin of the body. Colour: pale rosy-red; 

 the pedal margin yellowish-red ; round the mouth a yellowish- 

 red annulus. The tentacles a somewhat darker rosy-red 

 than the pedal disc and body. 



Family Sideractidæ, mihi. 



Actinaria with numerous perfect septa. Few series 

 of short non-retractile tentacles. of which the innermost 

 series contains 8. Mesodermal circular muscles. 



Sideractis glacialis. n. g. et sp. 



fl. I. fig. 1. Pl. VII. figs. ln. 12. 



I have found it necessai ; y to establish a new family 

 for the Aetinia which I am now about to describe. In 

 some respects, it is true. it approaches to the genus Bolo- 

 cera. Gosse, which is ranged under the family Bunodidæ, 

 but vet it differs so materially from tliat. that it cannot 

 well be assigned to it. 



The pedal disc is round, thin. membranous, semitrans- 

 parent; measures about 20""" from sid,- to side, and has an 

 undulating margin. On its under surface lines issue. radiating 

 towards the middle. and indicating the insertions of septa. 



The column is exceedingly low, scarcely 5""" in height, 

 and somewhat narrower than the pedal disc. Its wall is 

 thin. and so transparent that the æsophagus, septa, and 

 mesenterial filaments may be seen; and upon its exterior 

 surface lb slender longitudinal lines may be observed — inser- 

 tions of septa — and. also. small round white papillæ, which 

 are placed rather compactly, but irregularly. 



The oral disc is somewhat broader than the uppermost 

 margin of the body, but not quite so broad as the pedal 

 disc. It is slightlj arcuate. has the same kind of white 

 papillæ as the body. and in its middle it has an oblong 

 mouth with 8. conical, hollow lobes, of which two form 

 the oral angles and lead down to the gullet-grooves, whilst 

 the others form the labiæ, viz. 3 on each lobe (Pl. I. fig. 1, 

 Pl. VII. fig. 12). Sixteen lines issue from the mouth and 

 radiate towards the margin of the disc. 2 from each oral 

 lobe, and they indicate the insertions of the septa. 



The tentacles are non-retractile and form 3 series: 

 they are short. thick. conically acuminated, and appear to 

 have an aperture on their outermost extremity (Pl. I, fig. 

 1. Pl. VIT. fig. 12 1. In the innermost series, which is 

 placed somewhat back from the margin of the disc. there 

 are 8 tentacles; these are the largest, being both the 



