37 



nederste Halvdel, uregelmæssigt ordnede Cinclides; dens 

 øverste Rand er fri, ikke meget tyk og lidt unduleret (en 

 svag Parapet); ingen Fossa. 



Mundskiven er bredere end Kolumnen, lidt hvælvet, 

 temmelig stærkt foldet og forsynet i sin Peripheri med 3 

 Rækker Tentakler. Munden er meget fremstaaende, aflang, 

 med 2 hivde Gonidiegruber, der hver har 2 smaa Gonidie- 

 knnder. Læberne danne 4 tykke Folder paa hver Side 

 .■it' Gonidiegruberne, Tab. IT. Fig. 2. 



Tentaklerne ere retraktile, kurte, tynde og per- 

 forerede i Enden, i hver Række 4*. som staa alternerende. 

 Tentaklerne i den inderste Række ere de længste og tyk- 

 keste, dog knap saa lange som Skivens halve Bredde: i 

 den yderste Række staa de strax indenfor Kolumnens Rand 

 og ere noget kortere. 



Kroppens Væg er kjødet, og naar Dyret er ndspændt. 

 sees- de straagule Mesenterialfilam enter meget tydeligt. 



Farven. Kroppen er karmosinrød med lyserøde 

 Længdestriber ; Mundskiven ligesom Tentaklerne bleg 

 ehamoisfarvet ; Folderne paa Mundskiven synes at viere 

 lidt blegere, forresten er det noget afhængigt af, hvorvidt 

 denne er helt udfoldet eller ikke. I det Hele tåget varierer 

 Farven noget paa de forskjellige Individer, fra Lakfarve 

 til Karmin; selv det samme Individ forandrer Farve fra 

 Lak til Karmin. ettersom det er mere eller mindre 

 udstrakt. Gonidiegruberne ere lidt intensere rode end 

 Læberne. 



Naar Dyret er kontraheret, er som oftest baade 

 Mundskiver og Tentakler skjulte; det danner ila en Halv- 

 lengde, hvis ydre Flade er stærkt rynket baade paatvers 

 og paalangs; paa enkelte Exemplarer er Kontraktionen 

 ikke fuldstændig, og da er der en lille Aahning, hvori- 

 gjennem enkelte Tentakler stikke frem. samt en Del lange 

 Acontier, Tab. VIII, Fig. 13. 



Kroppens ydre Flade har sin sædvanlige eetodermale 

 Beklædning, Tab. VIII, Fig. 6 a. 14 a, indenfor hvilken 

 er et bredt, fibrillært Bindevævslag, hvori sees Bindevævs- 

 legemer med deres Kjerne, samt Aabninger for Ernærings- 

 kanalerne, Tab. VIII, Fig. 6 b, 14 &. I omtrent Midten 

 af dette Bindevævslag, noget nærmere Ectodermet, sees en 

 Samling af cirkulære Muskler, der danne et bredt Belte, 

 og hvis enkelte Fibriller tildels anastomosere med hver- 

 andre', Tal). VIII, Fig. ti r, 14 c. Paa Tversnit ere disse 

 Anastomoser temmelig tydelige, ligesom mange Fibriller 

 eir saa tykke, at de sandsynligvis beståa af dere finere 

 saadanne, Tab. VIII. Fig. (i c; thi paa Længdesnit, hvor 

 Musklerne ere afskaarne paatvers, fremkommer et Billede. 

 der end yderligere synes at antyde dette. Tab. VIII, 

 Fiii. 14 c. MusHerne ligge her nemlig ligesom i Skil- 

 ninger, og hver Slyngning bestaar af mange Fibriller. Paa 

 enkelte Steder ligge disse mesodermale Cirkulærmuskler 

 temmelig nær Eetodermet, og enkelte strække sig endog 



longitudinal folds, on which are observed, especially upon 



its lowest half. irregularly placed cinclides; its uppermost 

 margin is tier. not very thick. and slightly undulating (a 

 faint parapet). without fosse. 



The oral disc is broader than the coloumn, a little 

 arcuated, rather strongly folded, and furnished on its 

 periphery with 3 series of tentaeles. The mouth is very 

 protuberant, oblong, has 2 broad gonidial grooves, each of 

 which has 2 small gonidial nodules. The labiæ form 4 

 thick folds on each side of the gonidial grooves (Pl. II, 

 fig. 2). 



The tentaeles are retractile. short and thin. and are 

 perforated at the extremity; there are 48 tentaeles iu each 

 series, placed alternatingly. The tentaeles in the inner- 

 most series are the longest and thickest, but are not quite 

 so Long as the half of the breadth of the disc; the outer- 

 mosl series is placed immediately inside of the margin of 

 the eolumn, aud in it the tentaeles are somewhat shorter. 



The wall of the body is fleshy, and when the animal 

 is expanded the stfaw-yellow coloured mesenterial fila- 

 ments are very distinctly seen. 



The colour. The body carmine-red, with light-red 

 longitudinal stripes. The oral disc. as also the tentaeles, 

 pale butf colour. The folds on the oral disc appear to be 

 somewhat paler, but there colour depends, however, some- 

 what, upon whether the disc is entirely unfolded or not. 

 Altogether, the colour varies somewhat in the different 

 individuals, from scarlet to carmine colour; even the same 

 individual shifts colour from scarlet to carmine. according 

 as it is more or less extended. The gonidial grooves 

 have a little brighter red colour than the labiæ. 



When the animal is contracted, both the oral disc 

 and the tentaeles are most frequently concealed. It 

 then forms a hemisphere whose outer surface is strongly 

 wrinkled, both transversally and longitudinally ; in a few 

 specimens the contraction is inconiplete, and then there 

 is a small orifice through which a few tentaeles prqject, 

 aud also a number of long acontiæ (Pl. VIII. rig. 13). 



.The exterior surface of the body lias the usual ecto- 

 dermal covering (Pl. VIII, fig. 6 «. 14 ff), inside of. which 

 there is a broad tibrillar layer bf connective-tissue, in which 

 connective-tissue corpuscles with .their nuelri are observed, 

 as well as. also. orifices for nutritory ducts (Pl. VIII. fig 6 /<. 

 14 b). At a.bout the middle of this connective-tissue layer. 

 but somewhat closest to the ectoderm, a collection of circular 

 muscles is observed, which form a broad belt and whose 

 individual filirils partly anastomose with each other 

 (Pl. VIII, fig. 6 c, 14 c). In transverse sections those 

 anastomoses appear pretty distinctly. whilst, also. niany 

 fibrils are so thick. that they, presumably. are formed of 

 several together (Pl. VIII, fig. 6 c); because in longitudinal 

 sections, where the muscles are transsected transversally, 

 there is presented a picture which appears still more to 

 substantiate that (Pl. VIII. rig. 14 c). The muscles lie 

 here as if in windings, and each such winding consists of 

 many Hbrils. In a few places those mesodermal muscles 



