112 



Edwardsia fusca. 



Tab. V. Fig. 6; Tab. XIX. Fig. :.— 9. 



Legemet med Tentakler er 55""" langt. 



Scapus, der er 28""" lang, cylindrisk, har et skede- 

 formigt Overtræk, der er stærkt inkrusteret af brun Sand 

 og Ler, og er forresten næsten glat, idet der ingen frem- 

 trådende Ribber vise sig. Tab. V, Fig. 6; Tab. XIX, 

 Fig. 5 a. Skeden er fast, membranøs og temmelig stærkt 

 adhæreret til den underliggende Hud. Na.ar dette Over- 

 tråkk enten løsnes ved Dyrets stærke Kontraktioner, eller 

 det løsnes paa kunstig Maade (ved Afskrabning), sees 

 indenfor 8 Linier. imellem hvilke der er 8 temmelig brede 

 Længdefelter. hvori ved stærk Loupe iagttages 2 Rækker 

 yderst smaa Papiller, som staa ved Siden af hinanden og 

 synes at have en fin Indsænkning (Aabning) i Midten. 

 Tab. XIX. Fig. 6. 



Capitulum er 12""" langt, rørformet, kun lidet gjen- 

 nemsigtigt, men har paa sin ydre Side opimod Mundskiven 

 12 kastaniebrune Ribber, der et Stykke bagtil smelte 

 sammen til 8, som da blive mindre fremspringende, ja 

 næsten flade, idet de forlænge sig hag til Scapus. Tab. 

 XIX, Fig. 5 b, hvor de fortsætter sig i de paa denne 

 omtalte Linier. Ogsaa paa Capitulum kan ved stærk Loupe 

 iagttages yderst smaa Papiller, der ligeledes her staa i 2 

 Rækker og ere af samme Beskaffenhed som de paa Scapus, 

 men staa hengere fra hverandre i Rækkerne. Mundskiven 

 danner en svag Konus; Mumien er lidt aflang, Tab. XIX. 

 Fig. 5, og fra den udgaa 12 fine Folder henimod Peri- 

 pherien. der indtages af 12 Tentakler, som ere retraktile, 

 staa i en Række. ere tykke ved Grrunden og 10"'" lange. 

 Tab. V, Fig. 6; Tab. XIX. Fig. 5. Hele Capitulum med 

 Mundskive og Tentakler kan drages ind i Scapus og ganske 

 skjules af denne. 



Physa danner en halvkugleformet Blære, 5""" lang. 

 næsten vandklar og forsynet med 8 Længdestriber, der ere 

 Fortsættelser af de paa Scapus antydede Linier. Tab. V. 

 Fig. 6; Tab. XIX. Fig. 5 c; ogsaa Physa kan inddrages 

 i Scapus, og da sees alt id en ottefoldet Fordvhning. som 

 lettelig i Dyrets sammentrukne Tilstand kan tåges fol- 

 den forreste Del, naar man ikke har observeret Blæren, 

 i medens den var ude. 



Farven. Capitulum svagl brunrødt med 12 temmelig 

 brede, mørk kastaniebrune Linier. imellem hvilke sees 

 blegere Længdefelter. Mundskiven er kjødrød, har to 

 brune Ringe, den ene i Nærheden af Tentaklernes Grund, 

 den anden længere inde ved Mundaabningen. Disse 

 Ringe beståa af smaa. brune FJækker, der ved at støde 

 til hverandre danne en sammenhængende Ring. Tentak- 

 lerne have 3 merkebrune Ringe, som hver paa den 

 adorale Side egentlig bestaar af 2 triangulære Flækker. 



Edwardsia fusca. 



Pl. V, fig. li: Pl. XIX. fig. 5—0. 



The body with the tentacles measures 55""" in length. 



The scapus measures 28""" in length. is cylindrical. 

 and has a vaginale covering strongly encrusted with brown 

 saud ;uid cia v. hut otherwise is almost smooth, as no prominent 

 ribs are apparent (Pl. V. fig. 6; Pl. XIX. fig. 5 a). The 

 sheath is finn, membranous. and rather firmly adherent to 

 the integument underneath. When this covering either 

 becomes loosened by the violent contractions of the animal, 

 or is loosened in an artificial way (by scraping), 8 lines 

 are visible underneath. between which there are 8 rather 

 broad longitudinal areas, in which, with the aid of a 

 powerful magnifying glass. 2 series of extremely minute 

 papillæ are observed, placed alongside each other, and 

 appearing to have a fine depression (aperture) in the 

 middle (Pl. XIX. fig. 6). 



The capitulum measures 12""" in length. is tuhular, 

 only slightlv transparent, hut it bas, on its outer side. up 

 towards the oral disc. 12 chestnut-brown ribs that a litt L* 

 way back resolve themselves into 8, which then become 

 less prominent, indeed almost flat, as thev prolong them- 

 selves backwards to the scapus (Pl. XIX, fig. 5 1>). where 

 they prolong themselves into the previously mentioned 

 lines nppearing upon it. Also on the capitulum there 

 can. with the aid of a powerful magnifying glass, he ob- 

 served extremely minute papillæ, which are likewise, here, 

 placed in 2 series, and are of the same nature as those 

 ot the scapus. hut placed farther apart from each other in 

 the series. The oral disc forms a gentle cone. The mouth 

 is slighth oblong (Pl. XIX, fig. 5), and from it there issne 

 12 tine folds towards the periphery, which is occupied 

 by 12 tentacles that are retractile and placed in a single 

 series: thev are thick at the hase, and measure Kt"'" in 

 length (Pl. V. fig. 6; Pl. XIX. fig. 5). The entire capi- 

 tulum with the oral disc and tentacles may he withdrawn 

 into the scapus and be quite concealed by it. 



The physa forms a semi.-spherical vesicle 5""" in length. 

 almost pellucid, and furnished with 8 longitudinal stripes. 

 which are prolongations of the lines indicated on the 

 scapus (Pl. V. fig. 6; Pl. XIX. fig. 5 f)\ the physa may 

 also he withdrawn into the scapus. and then there is 

 always visible a depression of 8 folds, which, in the con- 

 tracted condition of the animal, may easily be mistaken for 

 the anterior portion, if the vesicle had not been observed 

 when it was exposed. 



The colour. The capitulum faint brownish-red with 

 12 rather broad, dark chestnut-brown lines, between which 

 paler longitudinal areas are observed. The oral disc is 

 flesh-coloured, has two brown annuli. the one in the 

 neighbourhood of the base of the tentacles, and the other 

 farther in. near the oral aperture. These annuli consist 

 of small brown patehes. which by uniting with each other 

 form one continuous annulus. The tentacles have 3 dark 

 brown annuli. each of which really, on the adoral side, 



