111 



Tentaklerne have et bredt Ectoderm, dannet af høie, 

 cilierende Cylinderceller, imelleai hvilke findes en utallig 

 Mængde Nematocyster, Tab. XX. Fig. 13 a. Indenfor 

 Bctodermet sees et lyst Belte, bestaaende af en finkornet 

 Masse, der har Udseende af overskaarne Rør, og som 

 muligens kau være Nervefibriller, Tab, XX. Fig. 13 b. 

 Xervestrænge eller Ganglier har jeg imidlertid ikke iagt- 

 taget, saa nogen Sikkerhed tor. at dette Belte tilhører 

 Nervesystemet, haves ikke. Indenfor denne kornede Masse 

 ligger et Lag at' stærke Længdemuskler, Tab. XX, Fig. 

 13 c, som stottes af et temmelig smalt Bindevævslag, Tab. 

 XX. Fig. 13 d. Paa dettes indre Væg sees Cirkulær- 

 musklerne, Tab. XX. Fig. 13 e, der langtfra ere saa ud- 

 viklede som Længdemusklerne, og hvortil fæster sig et indre 

 Epithel, der dannes af lige saa hoie. cilierende Cylinder- 

 celler som de, der forme Ectodermet, Tab. XX. Fig. 13 J. 

 < Igsaa paa Mundskiven er den ectodermale Beklædning 

 forsynet med en stur Mængde Nematocyster. 



Findested. 

 Station 253. Mange Exemplarer. 



Artskarakter. 



Legemet 90'"'" langt. Scapus cylindrisk, 50""" lang. 

 8 — 10'""' bred. forsynet med et skedeformigt Overtræk, 

 samt 8 Længderibber, der har en Række koniske Papiller, 

 paa hvis Ende sees en fri Aabning. Capitulum 14""" langt, 

 ii bredt, cylindrisk. hai- 8 fine Længdelinier, Fortsættel- 

 ser al' Ribberne paa Scapus. Mundskiven lidt hvælvet, med 

 en lidt atiang Mund. 12 Tentakler, retraktile, stillede i en 

 Række. Hele Capitulum kan inddrages i Scapus. Physa 

 danner en ægformet, vandklar Blære, der kan trækkes ind 

 i Scapus og er forsynet med 8, lidet fremtrædende Linier, 

 Fortsættelser af Ribberne. Udstrakt er Physa H>""" lang, 

 8""" bred. Farven: Scapus grøn med enkelte brungule 

 Punkter, ligesaa det skedeformige Overtræk; men selve 

 Cutis er aldeles farvefri. Capitulum er vandklart, fuld- 

 stændigt gjennemsigtigt, saa det brune Svælgrør skinner 

 igjennem. Mundskiven brun, noget lysere end Øsophagus. 

 Tentaklerne ere ligeledes vandklare, paa Enderne svagt 

 violette; laugs den adorale Side en tin, violet Stribe og 

 om Grunden en brun Bing. Ved den øverste Rand af 

 Capitulum en Kreds af temmelig intens brune Punkter, 

 der ere saaledes delte, at det faar Udseende af to Ringe, 

 en brun og en hvid. 



The tentacles have a broad ectoderm formed ol' high, 

 ciliating cylinder-cells, between which theré are found an 

 inmimerable multitude of nematocysts (Pl. XX, fig. 13 a). 

 To the inside of the ectoderm a light-coloured belt is seefn, 

 consisting of a finely granulated substance having the ap- 

 pearance of transsected tubes, and which niay. possibly, be 

 nervous fibrils (Pl. XX. fig. 13 b). Nerve-cords or ganglia 

 I have, however, not been able to observe, so that I have 

 no distinct evidence that this belt pertains to the nervous 

 system. On the inside of this granular substance there lies a 

 Livn- of strong longitudinal muscles (Pl. XX, fig. 13 c), which 

 is supported by a rather narrow laver of connective-tissue 

 (Pl. XX, fig. 13 d). On the inner wall of this last-named 

 layer the circular muscles are observed (Pl. XX, fig. 13 e 

 — which are far from being so developed as the longi- 

 tudinal muscles are — and to which an inner epithelium 

 secures itself; this epithelium consists of equally high. cili- 

 ating cylinder-cells as those that form the ectoderm (Pl. 

 XX. fig. 13,/'). On the oral disc, also, the ectodermal 

 covering is supplied with a great abundance of nematocysts. 



Habitat;. 

 Station No. 253. Numerous specimens. 



Specific characteristics. 



The body nieasures 90'"'" in length. The scapus cyl- 

 indrical, nieasures 50""" in length and 8 — 10'""' in breadth, 

 is furnished with a vaginate covering, as well as 8 longi- 

 tudinal ribs carrying a series of conical papillæ, on whose 

 extremity a minute aperture is visible. The capitulum 

 nieasures 14""" in length and 6'"'" in breadth, is cylindrical, 

 has 8 fine longitudinal lines, prolongations of the ribs of 

 the scapus. The oral disc a little arcuate with a slightly 

 oblong mouth. 12 tentacles, retractile, placed in a single 

 series. The entire capitulum capable of retraction into 

 the scapus. The physa forms an ovate, pellucid vesicle 

 that eau be withdrawn into the scapus, and is furnished 

 with 8 little-prominent lines, prolongations of the ribs. 

 When extended the physa nieasures 10""" in length and 

 8""" in breadth. The colour: The scapus green with a few 

 brownish-yellow clots, that is the vaginate covering espec- 

 ially has that colour, but the cutis proper is quite colour- 

 less. The capitulum is pellucid. perfectly transparent, so 

 that the brown gullet-tube appears visible through it. The 

 oral disc brown, somewhat lighter in colour than the 

 æsophagus. The tentacles are also pellucid. pale violet in 

 colour at the extremities, a fine violet stripe along the 

 adoral side, and round the base a brown annulus. At the 

 uppermost margin of the capitulum. there is a ring of 

 rather intense brown dots. distributed in sueh manner that 

 they acquire the appearance of two annuli. one brown and 

 one white. 



