muskuløs, og naar den er sammentrukken, bliver den foldet 

 baade paalangs og paatvers, hvilket især er stærkt frem- 

 trædende, efterat Dyret er opbevaret paa Alkohol. Paa 

 det eneste Exemplar, som haves, iagttages henimod Fod- 

 skivens Rand enkelte Aeontier, der ved den stærke Kon- 

 traktion ere pressede igjennem Huden. 



Kroppen er søileformet, cylindrisk, henved 70""" bred 

 strax ovenfor Fodskiven, men smalner lidt af op imod 

 Mundskiven. og er ligesaa hoi som bred. I udstrakt Til- 

 stand er Kroppens Væg glat, halvt gjennemskinnende og 

 forsynet med fine, lidt fordybede Længdestriber, som an- 

 give Insertioiierne af Septa. Den ydre Kropsflade har 

 mange Sugevorter (Suckers), samt Cinclides. Sugevorterne 

 sidde i Rækker imellem Længdestriberne, Tab. II, Fig. 8, 

 og ere ikke meget freintrædende. Cinclides sees hist og 

 her som yderst fine Spalter imellem Sugevorterne. Hele 

 Kroppens Overflade faar paa G-rund af de gjennem Huden 

 skinnende Septa et fint foldet Udseende. Under Kontrak- 

 tionerne opstaa baade Længde- og Tverfolder, og i de der- 

 ved fremkomne Gruber ligge Sugevorterne, der tildels kunne 

 være dækkede af Slim, hvortil Ler er klæbet. Vaskes denne 

 Slim væk, varer det ikke længe, førend Kroppen paa.ny 

 overtrækkes dermed. Kroppens øverste Rand er tentaku- 

 lær. 



Mundskiven er lidt bredere end Kroppens midterste 

 Del, men ikke bredere end Fodskiven ; den er næsten plan, 

 stærkt foldet, og Folderne udbrede sig straaleformigt fra 

 Munden mod Peripherien saaledes, at de ere smalest ved 

 deres Udspring. 



Tentaklerne sidde i 3 Rækker og ere meget retraktile. 

 Den inderste Række har 6 meget tykke, lange Tentakler; 

 den mellemste har 24, som ere noget mindre, og den yder- 

 ste Række, der sidder lige i Randen, har ligeledes 24, om- 

 trent af samme Størrelse som de midterste. 



Munden er aflang med tykke, foldede Læber og 2 

 Gonidiegruber ; i enhver saadan sees to smaa Gonidie- 

 knuder. 



Farven: Fodskiven næsten melkehvid. Kroppen 

 egentlig hvid, men stærkt opaliserende, hvorved den auta- 

 ger et dels gulagtigt, dels svagt violet Skjær. Sugevorterne 

 have Kroppens Farve, kanske de ere lidt mørkere. Mund- 

 skiven er bleg brungul med mørkere Straaler, som udgaa 

 fra Munden, omkring hvilken er en intensere, brunrød Ring, 

 og strække sig hen til Tentaklerne. Noget udenfor denne 

 brunrøde Ring lindes atter en lignende, der dog er noget 

 bredere. Gonidiegruberne ere næsten gule. Svælgrøret gul- 

 livitlt. De inderste 6 Tentakler ere brungule, men deres 

 Grund er mørkere end den øvrige Del. D e andre Ten- 

 takler ere blegere, Tab. II, Fig. 8. 



septa. The pedal disc is firmly secured to stones, aud is 

 very muscular; when it is contracted, it becomes folded 

 both longitudinally and transversally; this is especially 

 noticeable when the animal has been preserved in alcohol. 

 In the solitary specimen which was obtained, a few acon- 

 tia may be observed in proximity to the margin of the 

 pedal disc, and these are forced through the integument 

 by the powerful contraction. 



The body is columnar. cylindrical. and measures about 

 70""" in breadth immediately above the pedal disc. but 

 diininishes somewhat in breadth up towards the oral disc, 

 and is the same in height as in breadth. In extended 

 condition, the wall of the body is smooth, semi-transparent, 

 and furnished with fine, slightly depressed, longitudinal 

 stripes, which indicate the insertions of septa. The ex- 

 ternal surface of the body has numerous suckers, as well 

 as cinclides. The suckers are seated in series, between 

 the longitudinal stripes (Pl. II, fig. 8), and are not very 

 prominent. The cinclides are, here and there, seen between 

 the suckers, appeaTing as extremely fine fissures. The 

 entire external surface of the body acquires a fine folded 

 appearance, owing to the septa shining through the integ- 

 ument. Upon contraction, both longitudinal and trans- 

 versal folds appear, and in the cavities thus formed the 

 suckers are seated, appearing, sometimes, covered with 

 mucous to which clay is adherent. If this mucous is 

 washed off, it is not very long before the body is again 

 covered with it. The uppermost margin of the body is 

 tentacular. 



The oral disc is a little broader than the medial 

 part of the body, but not broader than the pedal disc. 

 It is almost plane, strongly folded, and the folds distribute 

 themselves, radially, from the mouth towards the periphery, 

 in such manner that they are uarrowest at their origin. 



The tentacles are seated in 3 series, and are very 

 retractile. The innerrnost series has 6, verv thick, long 

 tentacles; the intermediate series has 24, which are some- 

 what smaller; and the outermost series, which is seated 

 quite in the margin, has also 24, of about the same size 

 as the medial oms. 



The mouth is oblong, with thick folded labiæ and 2 

 gonidial grooves, in each of which two small gonidial nodules 

 are seen. 



The colour. The pedal disc is almost milky-white, 

 but strongly opalescent, and, owing to that, it assumes a 

 partly yellow. partly faint-violet tinge. The suckers have 

 same colour as the body, but, perhaps, a little (larker in 

 colour. The oral disc is pale brown-yellow, • with darker 

 coloured ravs that issue from the mouth, round which there 

 is a more intense-coloured brown-red annulus, and they 

 extend themselves to the tentacles. A little outside of this 

 brown-red annulus. there is yet another and similar one 

 which, however, is somewhat broader. The gonidial grooves 

 are almost yellow. The æsophagus is yellowish-white. 

 The innerrnost 6 tentacles are brown-yellow, I mt their bases 

 are darker than the remaining part. The other tentacles 

 are paler in colour (Pl. II, fig. 8). 



