82 



endende i en lidt aflang Fodskive. Mundskiven lidt hvælvet, 

 forsynet med tine Folder, udstraalende fra den runde 

 Mund. Tentaklerne korte, i to Rækker. 12 i hver Række. 

 Farven : Den inkrusterede Del graagrøn, spillende lidt i 

 det Violette. Huden indenfor Krusten hvid; Mundskiven 

 med Tentakler bleg rosenrod; Stilken næsten farvelos; 

 Fodskiven har et fint, rodligt Skjær. 



Cactosoma ' abyssorum. 



Tab. VI, Fig. o; Tab. XXIII, Fig. f>— 8. 



Legemet kolleformet, cylindrisk, bredere i den øverste 

 Ende, meget smal i den nederste. Udstrakt er Dyret ind- 

 til 40""" langt, 10'""' bredt i den overste Ende, men kun 

 0""" i den nederste. Sammentrukken har det Pæreformen, 

 og da er den overste Ende mindst 16'""' bred. 



Storstedelen af Kolumnen har et tykt Overtræk af 

 inkrusteret, grov Sand, Tab. VI, Fig. 5 a, kun den øverste 

 Del er nogen i omtrent 4""" Høide til Mundskiven, Tab. 

 VI, Fig. 5 &; Tab. XXIII, Fig. 5 a. Men opimod denne 

 nogne Del har Kolumnen 6 temmelig brede, omtrent 6""" 

 lange, inkrusterede Ribber, Tal). VI, Fig. 5 c, imellem 

 hvilke tindes (5 ligesaa lange og brede Mellemrum, der ere 

 nogne, Tab. VI, Fig. 5 d. 



Mundskiven er stan-kt hvælvet, forsynet med 12 fra 

 Munden udstraalende Folder, Tab. XXIII, Fig. 5, og i 

 Midten sees den aflange Mund med foldede, næsten lap- 

 pede Læber og to smale Mundvige (Gonidiefurer). Ten- 

 taklerne staa i to alternerende Rækker, 12 i hver Række, 

 ere retraktile, lancetformede, brede ved Basis og med meget 

 tilspidsede Ender; de ere omtrent 2""" lange og 1,3""" brede 

 ve! Grnnden, Tab. VI, Fig. 5; Tab. XXIII, Fig. 5. 



Fodskiven er lidt hvælvet og stærkt inkrusteret paa 

 Overfladen med en rund, undulerende Rand, Tab. VI. Fig. 5 ; 

 Tab. XX1TI, Fig. 5, imedens Underfladen er lidt konkav, 

 nogen, fint foldet fra Centrum mod Peripherien og fæstet 

 til en liden Sten. 



Borttages den inkrusterede Overhud, hvilket kan ske 

 med stor Lethed, saa fremtræder den egentlige Hud, der 

 er næsten hvid, temmelig gjennemsigtig og forsynet med 

 12 fine Længdelinier. som antyde Insertionerne for Septa. 

 Imellem disse Linier sees overalt paa Legemets Overflade 

 en Mængde uregelmæssigt spredte Sugevorter, Tab. XXIII, 

 Fig. 5 5, der tildels staa saa tæt sammen, at de ved at 

 trække sig ind danne en større Grube, i hvis Bund iagt- 

 tages 3 — 4 hvidagtige Punkter, der angi ve Sugevorternes 

 Antal, Tab. XXIII, Fig. 5 c. Til disse Sugevorter ere 

 mange af de grove Sandkorn festede. 



xaxfo; = en pigget Plante <jw;j.o< = Legeme. 



whole surfaee. The stem is bare, 30""" in length, and ter- 

 minates [in a slightly oblong pedal disc. The oral disc 

 slightly areuate, furnished with tine folds radiating from 

 the circular mouth. The tentacles short, placed in two 

 series; 12 in each series. TJw colour. The encrusted 

 portion greyish-green with a violet play of colour. The 

 integument below the crust white. The oral disc with 

 tentacles pale rose-red. The stem almost colourless. The 

 pedal disc has a fine reddish tinge. 



Cactosoma ' abyssorum. 



Pl. VI. fig. 5; Pl. XXIII. fig. o—8. 



The body claviform, cylindrical, broadest in the 

 uppermost extremity, very narrow in the lowest. When 

 extended the animal measures up to 40""" in length. 10""" 

 in breadth at the uppermost extremity but only 5""" at 

 the lowest. When contracted it has a piriform shape, and 

 then its uppermost extremity is at least 16""" in breadth. 



The greater part of the column has a thick covering 

 of encrusted coarse sand (Pl. VI, fig. 5 a); only the up- 

 permost part is bare for about 4'"'" in height next the oral 

 dis,- (Pl. VI. fig. r. 6; Pl. XXIII. fig. 5 a). But up to- 

 wards this bare part, the column has (i rather broad — about 

 r>""" long — encrusted ribs iPl. VI, fig. 5 c), between which 

 there are intervening spares of similar length and 

 breadth. which are bare (Pl. VI. fig. 5 cl). 



The oral disc is strongly areuate. and is furnished 

 witli 12 folds radiating from the mouth iPl. XXIII. rig. 5); 

 in the middle the oblong mouth is seen. with folded, 

 almost lobate labiæ aud two narrow gonidial recesses 

 (gonidial-grooves). The tentacles are placed in two alter- 

 nating series. 12 in each series; they are retractile, land- 

 form, broad at the base. aud have very acuminate extrem- 

 ities; they are about 2""" in length, and 1,:'.""" in breadth 

 at the base (Pl. VI, fig. 5; Pl. XXIII. fig. 5). 



The pedal disc is a little areuate. strongly encrusted 

 on the surfaee. and has a round undulating margin (Pl. VI, 

 rig. 5; Pl. XXIII. fig. 5); whilst its under surfaee is a 

 little concave, hare, finely folded from the centre towards 

 the periphery. and is adherent to a small stone. 



If the encrusted covering is removed, which can be 

 done with great ease, then the integumeut-proper appears; 

 this is almost white, rather transparent, and furnished with 

 12 fine longitudinal lines indicating the insertions of septa. 

 Between those lines there is everywhere visible, on the 

 surfaee of the body, a. multitude of irregularly spread suckers 

 (Pl. XXIII, fig. 5 ln. partly placed so closely together 

 that, on retracting themselves they form. in doing so, a 

 considerable cavity. in whose bottom I! — 4 whitish points 

 are observed; these indicate the number of suckers (Pl. 

 XXIII, fig. 5 c). Many of the coarse grains of sand are 

 adherent to those suckers. 



1 xgcxto? = a spiav plant = (The Cactus) ; and uwuot = body. 



