gelen danner Bunden, Fig. 15, e. Tab. II, Fig. 2, a. Denne 

 Rende strækker sig opad fra Svælgfladens nederste Parti til 

 lidt uver Trefjerdedelen ai' samme og er bredest nedad, Tab. 

 II, Fig. 2, a Den adskiller sig fra den øvrige Del af 

 Svælgvæggen væsentlig ved sin særegne Epithelbeklæd- 

 ning, der dannes af meget lange, næsten traadformige 

 Pidskeeeller (Geisselcellen), som have en yderst tynd Mem- 

 bran, ere 0.060"™ lange, 0.020™"" brede, og en aflang Kjerne, 

 0.004""" lang, 0.002""" bred. der er placeret snart nedimod 

 den nederste Ende, snart paa Midten og snart høiere oppe, 

 Fig. 27. Celleindholdet er meget klart, og idet hver Celles 

 fri Ende, der synes at være rig paa Protoplastnaindhold, 

 stader tæt til Nabocellens, fremkommer en skarp Rand, der 

 har Udseende af en Cuticula, Tab. II. Fig. 2 /*. hvorfra 

 udgaa en Række lange, ved Grunden tykke Flimmerhaar. 

 (Cilier), som rage langt ind i Svælghulheden, Fig. 28. Tab. II. 

 Fig. 2; enhver Celle bærer kun et saadant Haar, eler er 

 0.040""» langt, Fig. 29. 



Ved Tversnit ai Svælget paa Alcoholpræparater faar 

 man et eiendommeligt Billede af denne Syælgrendes Epi- 

 thel, — det ser ud, sum om det bestaar af manee Låe 

 næsten elliptiske Celler, hvoraf de inderste, nærmest IIul- 

 heden, antage Cylinderformen og bære paa deres frie Ender 

 Flimmerhaar, Tab. II, Fig. 2 c. Kun ved Maceration 

 fremkom disse Cellers sande Form 1 . 



Udenfor Renden og saa langt, den naar op, er Svæl- 

 get beklædt med Cylinderepithel. forsynet med sædvanlige 

 Cilier; men ovenfor Svælgrenden dannes Epithelbeklædningen 

 af Polypens Ectodermceller, der dog langs Rygsiden stræk- 

 ker sig langt nedover Svælget. Imellem Svælgets Cylinder- 

 epithel tindes en stur Mængde kolbeformige Legemer, der 

 ligge dels spredte, dels i regelmæssige Rækker omkring 

 Længdefolderne, sjeldnere i Grupper, Tab. II, Fig. 2. (/. 



De ere fra 0.020— 0.040"»" lange og fra 0.010— 0.015™ 

 brede, som oftest vandklare og se ud sum Vacuoler, have 

 en langstrakt Hals med en Aabning paa Enden, Fig. 30. 

 Trili. II. Fig. 2, e. Ved Farvning fremkommer i den 

 nedre, brede Del en næsten rund Kjerne. 0.004"™ i Gjen- 

 nemsnit, med Kjernelegeme, omgiven af en seie- Masse, der 

 hyppig var trykket ml igjennem den før omtalte rine Aab- 



1 Dr. Blochman fra Heidelberg, dor i længereTid har arbeidet 

 i Bergens Museum, viste mig Præparater fra den indre Tarmvæg 

 hos Brachiopoderne, hvor det samme Forhold fandt Sted. Ai' hans 

 Macerationspræparater fremgik det tydelig nok. at Epithelbeklæd- 

 ningen bestod af lange, traadformige Celler, forsynede med lai e 

 Cilier, imedens den paa Alcoholpræparater viste sig som ovenfor om- 

 talt, nemlig ligesom bestaaende at' tirre Cellelag. 



tin' broad part of the triangle forms the bottom, ( Pl. I, fig. 15, e, 

 Pl. II, fig. 2, aj. This channel extends itself upwards, from 

 the lowest part of the surface oi' the gullet, till a little 

 above the three-fourths part ol' it, and it is broadest below, 

 (Pl. 2, fig. 2 aj. It is distinguished from tin' resl of the 

 wall oi the gullet prineipallv. by its peculiar epithelial 

 covering, formed of very long, flagellated, almost filiform, 

 cells (geissel-cells) having an extremely tliin membrane, 

 and measuring 0.060""" in length, and 0.020""" in breadth, 

 and containing an oblong nucleus measuring 0,004""" in 

 length and 0.002 mm in breadth, placed sometimes, down 

 towards the lowest extremity, sometimes, in the middle and, 

 sometimes, higher up, ('Pl. I, fig. 27). The cellular sub- 

 stance is very translueent and. as each eell's free extremity. 

 which appears to be rich in protoplasmic substance, ap- 

 proaches close to that of the neighbouring cell, a distinctly- 

 marked margin is produced, which has the appearance oi a 

 cuticulum, (Pl., 11 flg. 2, 6), from which a series of long cilia, 

 tliick at the root, proceed, extending far into the gullet- 

 eavity, (PI. I. fig. 28, Pl. II, fig. 2). Each cell carries 



onlv ane sueh eilium measuring 0.040' in length, (Pl. I, 



fig. 29). 



On making a transverse section of the gullet, in pre- 

 parations preserved in alcohol, we obtain a characteristic 

 representation of this gullet-grooves epithelium; it appears, 

 as it it consists of many layers of almost olliptical cells. of 

 which the innermost, next to the cavity, take the cylinder- 

 form, aud carry cilia mi their live extremities, (Pl. 11. rie'. 2. r). 

 Only after, maceration, did the true tonn cd' these cells 

 appear 1 . 



» >iitside the channel, and as mr up as it reaches. the 

 gullet is clad with cylinder-epithelium furnished with the 

 usual cilia, lutt above the gullet- channel the epithelial 

 covering is formed by the ectoderm-cells of the polyps, 

 which extend however along the dorsal side far down the 

 gullet, ln the gullets cylinder-epithelium, a greal multitude 

 of clavi-form corpuscles tire found, which are placed, 

 partlv dispersed and, partly, in regular series about the longi- 

 tudinal folds, moie rarely in groups, (Pl. 11, fig. 2 d). 



They measure, from 0.020—0.040"™ in length, and 

 from 0.010 — 0.015""" in breadth, and are most frequently 

 translueent, appearing like vacuoli; they have an elongated 

 neck with an aperture on the extremity. (Pl. I. rig. 30, 

 Pl. II. rig. 2. e). On staining, an almost spherical nucleus 

 appears in the lower, broad part; it measures 0.004""" in 

 diameter, and has its nucleus body surrounded by a tough 

 substance. which was frequently exuded from the mintite 

 aperture previously spoken of. These corpuscles are not 



1 Dr. Blochman, frem Heidelberg, who studied for a consider- 

 able time in Bergens Museum, showed me preparations frem the 

 inner intestinal wall of the Brachiopods where the same relations 

 existed. From his macerated preparations it appeared, disthietly 

 enough, that the epithelial covering consisted of long filamentous cells 

 furnished with long cilia. whilst in preparations preserved in alcohol 

 it appeared us above described, viz. as if consistmsr of several cell- 

 ular layers. 



