128 



FOKKLARING OVER FIGURERNE. 



Tab. 13. Fig. i. Sipunculus priapuloides, naturlig Størrelse, seet 

 fra Ryggen, a Analaabning; Ir Længdemuskler; v, v 

 den frie crenulerede Rand paa Glans; g Glans; l frem- 

 ragende Læbe; p Snabel. 



Fig. 2. Seet fra Bugen. /Furen paa Glans; m } m Furens Rand; 

 v, v den frie, ikke crenulerede Rand paa Glans ; l Grube 

 og Læben. 



Fig. 3. Sipunculus priapuloides, aabnet, naturlig Størrelse, d Di- 

 vertikel; r, r Retractor er ; re Rectum; m Længdemusk- 

 ler; sp Spindelmuskel; o kjertelformige Organer; s, s 

 Segmentalorganer; ta Tarm; t Tentakler. 



Fig. 4 A. Peritoneum med Indgangsaabning for Respirationskar, 

 stærkt forstørret, i Indgangsaabning for Karret; p,p Pe- 

 ritoneum; f, /* Muskelfibre og deres Krydsning. 



Fig. 4 B. Væg af et Kar, stærkt] forstørret, f Muskelfibrenes 

 Krydsning i Peritoneum. 



Fig. 5. Gjennemsnit af Huden parallelt med Ringmusklerne, stærkt 

 forstørret, c Cuticula; e Cellelaget; r Ringmuskler. 

 I Længdemuskler; p Peritoneum; et Cutis; rTc Respi- 

 rationskar (Keferstein). 



Fig. 6. Perpendicuiært Hudgjennemsnit paa Ringmusklerne i et 

 Mellemrum mellem to Længdemuskler. c Cuticula; 

 e Cellelaget; k, Jc Kar; r Ringmuskler; p Peritoneum; 

 b Communicationsaabningen mellem Peritonealhulheden og 

 Respirationskarret, fyldt med sammenpakket Masse af Blod- 

 legemer. 



PHASCOLOSOMA L0VÉN1I, Nobis. 

 (Tab. 14, Fig. 17—21.) 



Legemet cylindrisk, overalt tæt besat med Papiller, 

 100 Mm. langt, hvoraf Snabelen indtager omtrent den 

 balve Længde. Den bagerste, afrundede Ende er lidt til- 

 spidset. Kroppen er paa det Bredeste 13 Mm., men af- 

 tager i Tykkelse henimod Analaabningen. Strax foran 

 denne, lige ved Snabelens Begyndelse, ere Papillerne større, 

 mere fremragende og danne ligesom et Belte af omtr. 

 10 Mm. Bredde; længere fortil paa Snabelen blive Papil- 

 lerne mindre og mere spredte. Overalt ere disse Pa- 

 piller lidt conisk fremspringende, forsynede med en Aab- 

 ning, i hvis Omkreds sees en Mængde hornagtige Granula- 

 tioner (Fig. 21 g, g). Munden aabner sig nærmere Bug- 

 siden med en Tværspalte, hvorved der dannes ligesom 2 

 Læber, der omsluttes af en fremstaaende Band (Fig. 19). 

 Den underste Læbe er den største og noget hvælvet for- 

 til; den øverste er smalere, men mere fremspringende, 

 næsten halvmaaneformig og har paa sin Hvælving omtr. 

 30 Tentakler, der sidde i to afvexlende Bækker. *) Spise- 

 røret langt og smalt, løber i en lige Linie langs Betrae- 

 torerne bag mod det Sted, hvor Segmentalorganerne tage 

 deres Begyndelse; derfra gaar det over i den spiralför- 

 mige Tarm, som for en stor Del er bedækket af Gene- 

 rationsorganet (Fig. 18 g), slaar sig derpaa omtr. 10 Mm. 

 fra Kropshulhedens Bund fortil, og ender i en kort Ende- 

 tarm, der ved en Mængde senede Traade er fæstet til 

 Længdemusklerne (Fig. 18 r). Nedentil er Tarmkanalen 



] ) Noget Lignende finder ogsaa Sted ifølge Grubes Iagttagelser 

 ved Phase, granulatum, Leuek., Phase, asperum, Gr. og Phase, 

 semirugosum, Gr. 



EXPLANATION OF THE FIGURES. 



Tal). 13, fig. 1. Sipunculus priapuloides, natural size, viewed from? 

 the dorsal side, a the anal aperture; Ir longitudinal 

 muscles; v, v the free crenelated margin on the glans* 

 g the glans; I projecting lip; p proboscis. 



Fig. 2. Viewed from the ventral side, f furrow on the glans- 

 in, m margin of the furrow; v,v the free, not crenelated 

 margin on the glans; I cavity and lip. 



Fig. 3. S. priapuloides, open, natural size, d diverticle; r y r re- 

 tractor; re rectum; m longitudinal muscles; sp fusiform 

 muscle; o glandulous organs; s, s segmental organs; 

 ta intestine; t tentacles. 



Fig. 4 A. Peritoneum with entrance apertures for the respiratory 

 vessels, strongly magnified, i the entrance opening for 

 the vessel; p, p peritoneum; f, f muscular fibres and 

 their intersection. 



Fig. 4 B. Wall of a vessel strongly magnified, f intersection 

 of the muscular fibres in the peritoneum. 



Fig. 5. Section of the cutis parallel with the annular muscles 

 strongly magnified, c cuticula; e layer of cells; r annular 

 muscles; I longitudinal muscles; p peritoneum, ct cutis- 

 rh respiratory vessels (Keferstein). 



Fig. 6- Perpendicular section of the skin on the annular muscles 

 in an interval between two longitudinal muscles, c cuti- 

 cula; e layer of cells; hjh vessels; r annular muscles; 

 P peritoneum ; b apertures of communication between the 

 peritoneal cavity and the respiratory vessel filled with 

 an agglomerated mass of blood globules. 



PHASCOLOSOMA LOVÉNI1, Nobis. 

 (Tab. 14, fig. 17—21). 



The body cylindrical, everywhere densely covered 

 with papillæ; 100 Mm. long; the proboscis occupying 

 about half the length. The posterior rounded extremity 

 is a little tapered. The body is at the broadest part 

 13 Mm., but diminishes in thickness toward the anal 

 aperture; immediately before the latter, close to the 

 commencement of the proboscis, the papillæ are larger, 

 more prominent, and form, as it were, a belt of about 

 10 Mm. in breadth; further forward on the proboscis, the 

 papillæ -are smaller and more dispersed. Everywhere 

 these papillæ are a little conically prominent, with an 

 aperture, in the periphery of which there appear a 

 number of horny granulations (fig. 21 g, g). The mouth 

 opens nearer to the ventral side with a transverse slit, 

 whereby there are formed, as it were, 2 lips surrounded 

 by a prominent margin (fig. 19). The under lip is the- 

 larger and somewhat arched forward; the upper lip is 

 smaller, but more prominent, nearly semilunar, and has 

 on its arch about 30 tentacles, situated in two alternate 

 series 1 ). The oesophagus, long and narrow, runs in a 

 straight line, along the retractors, backwards towards 

 the place where the segmental organs have their com- 

 mencement, and thence goes over into the spiral intestine, 

 which in great part is covered by the organ of generation 

 (fig. 18 g), turning afterwards forward, about 10 Mm, 

 from the bottom of the perivisceral cavity, and terminates- 



*) Something similar exists also according to Grube's observa- 

 tions in the Phase, granulatum, Leuck, Phase, asperum, Gr. and* 

 Phase, semirugosum, Gr. 



