Ki7 



det brune Svælgrør skinner igjennem. Mundskiven er brun. 

 neget lysere end Øsophagus. Tentaklerne ere ligeledes 

 vandklare, men have paa Enderne en svag violet Farve, 

 der som en tin Linie strækker sig noget nedover den 

 adorale Side. ligesom de ved Granden have en brun Eina;. 

 Bele Capitulum med Tentaklerne er forresten ganske uden 

 Farv£ og antager mod Lyset et blaaligl Skjær. Ved den 

 øverste Raml af Oapitulum er en Kreds at' temmelig intens 

 brune Punkter, som sidde to og to sammen paa en melke- 

 hvid Bund, hvorved det faar [Jdseende af to Ringe, -- en 

 brun og en hvid, nedenfor den brune. 



Det skedeformige Overtræk paa Scapus er ikke organisk 

 forbundet med Dyrets Hud. men er klæbet fast til denne 

 ved en meget seig Slim. hvori der inkrusteres en Mængde 

 fremmede Legemer, alt efter Bundens Beskaffenhed, Tab. 

 XX, Fig. 3, 5 a. Men denne Slim kan fortsettes til en 

 fast Membran, saaledes som Tilfældet er hos flere Phellia- 

 arter. 



Ved Tversnit af Kroppens Hud viser sig den histo- 

 logiske Bygning, paa faa Undtagelser nær, at være ens 

 overalt. Ectodermet bestaar af temmelig hoie Cylinder- 

 celler, der paa Oapitulum og Physa ere forsynede med 

 Cilier. imedéus de paa Scapus synes at være uden saa- 

 danne, Tab. XX. Fig. 3 b, 5 b. Imellem disse Ectoderm- 

 celler sees ægformede, encellede Slimkjertler, dels fyldte 

 med en kornet Masse, der ganske skjuler Kjernen, dels 

 tomme. 



Indenfor Ectodermet er et bredt Lag fibrillært Binde- 

 væv, hvori iagttages Bindevævslegemer med Udløbere, samt 

 fine Ernæringskanaler med Epithel, Tab. XX. Fig. 3 c, 5 c, 

 og henimod den indre Flade af dette Bindevæv er et smalt 

 Belte af cirkulære Muskler. Tab. XX, Fig. 3 d. Paa 

 selve den indre Flade er et Muskellag festet, bestaaende 

 af Tver- og Længdemuskler. Tvermusklerne ere temmelig 

 udviklede, samlede i Bundter, Tab. XX. Fig. 4 a, som 

 afskjæres af de 8 stærkt fremtrædende Længdemuskler, 

 Tab. XX. Fig. 4 6. Dette Muskellag er beklædt med et 

 Endothel. dannet af hoie Cylinderceller , forsynede med 

 Cilier. Tab. XX. Fig. 3 e. op. Paa Physa og Oapitulum 

 er Bindevævslaget noget smalere end paa Scapus. 



Men formlen de her nævnte Elementer tindes der 

 indleiret i Huden de tidligere omtalte Papiller. De have 

 en ganske særegen Organisation; i selve Bindevævet danne 

 de en tast Kapsel, der ei- ægformig, afsluttet indad, men 

 forlænge sig udåd. hvor de udmunder paa Kroppens Over- 

 flade, Tab. XX. Fig. 3/, bf. Fra Kapselens indre Væg 

 udgaa Bindevævsforlængelser i alle Retninger, og i disse 

 seis stærkt udviklede. stjerneformige Bindevævslegemer med 

 Kjerne og Kjernelegeme. Fra disse Bindevævslegemer ud- 

 sendes tine Udløbere, der anastomosere med Udløbere fra 

 tilgrændsende Bindevævslegemer, hvorved der dannes et 



transparent, so that the brown gullet-tube becomes visible 

 through. The oral disc is brown, somewhat lighter in 

 colour than the æsophagus. The tentacles are also pel- 

 lucid, but have at the extremities a faint violet colour. 

 which, like a fine line. extends a short way down the adoral 

 side. whilst. also. they have a. brown annulus at the base. 

 The entire capitulum and tentacles are. otherwise, quite 

 colouiiess, and acquire wlien turmål to the light a bluish 

 tinge. At the uppermost margin of the capitulum there 

 is a ring of rather intense-brown dots, placed two and two 

 together on a milk-white ground, imparting the appearance 

 of a double ring — a brown one, and a white one below 

 the brown one. 



The vaginate covering of the scapus is not organically 

 united with the integument of the animal; it is firmly 

 glued to it by a very viscid mucous, in which there are a 

 multitude of foreign bodies, according to the nature of the 

 sea-bottom, encrusted (Pl. XX, fig. 3, 5 a). But this mu- 

 cous is capable of being condensed into a firm membrane, 

 in the same manner as happens in several of the Phellia 

 species. 



A section of the integument of the body shows, that 

 the histological structure, with only slight exceptions, is 

 everywhere the same. The ectoderm consists of rather high 

 cylinder-cells which, on the capitulum and physa, are fur- 

 nished with eiliæ, whilst on the scapus they appear to 

 have none (Pl. XX, fig. 3 b, 5 b). Between those ecto- 

 derm cells, oviform unicellular mucous glands are observed, 

 partly filled with a granular substance that quite conceals 

 the nucleus. or partly empty. 



On the inside of the ectoderm there is a broad 

 layer of fibrillous connective-tissue, in which connective- 

 tissue corpuscles with prolongations are observed, also 

 slender nutritory ducts with epithelium (Pl. XX, fig. 3 c, 

 5 c), and towards the inner surface of this connective- 

 tissue there is a narrow belt of eircular muscles (Pl. 

 XX, fig. 3 d). On the inner surface, itself, there is 

 a musculous laver adherent, consisting of transversal and 

 longitudinal muscles. The transversal muscles are pretty 

 well developed, and are collected into bundles (Pl. XX. 

 fig. 4 a) which are cut across by the 8 strongly-prominent 

 longitudinal muscles (Pl. XX, fig. 4 b). This musculous 

 laver is clad with an endothelium formed of high cylinder- 

 cells furnished with eiliæ (Pl. XX. figs. 3 e, 5 é). On 

 the physa and capitulum the layer of connective-tissue is 

 somewhat narrower than on the scapus. 



But, in addition to the elements just named, there 

 are also found entrenched in the integument the papillæ 

 previously spoken of. The papillæ have quite a peculiar 

 organisation. In the connective-tissue itself they form a 

 finn capsule. ovate in shape, terminated inwards, but pro- 

 longed outwards, where they debouch on the surface of 

 the body (Pl. XX. figs: 3 /, b f). From the inner wall 

 of the capsule connective-tissue prolongations issne in all 

 directions. and in these, strongly developed, stelliform con- 

 nective-tissue corpuscles with nuclei and nucleus corpuscles 

 are seen. From these connective-tissue corpuscles slender 



14* 



