11 Mi 



Edwardsia Andresi. ' n. sp. 



Tab. V. Fig. f>; Tab. XX. 



Legemet er i udstrakt Tilstand med Tentaklerne 

 90""" langt. 



Scapus er cylindrisk, 50""" lang. 8 — 10""" bred paa 

 den midterste Del og forsynet med 8 Længderibber. Det 

 har et tvndt men fast membranøst Overtræk, som danner 

 en tæt sluttende Skede. Tab. V. Fig. 5; Tab. XX. Fig. 1. 

 hvori Dyrets begge Ender kunne indtrækkes. Paa Rib- 

 I leine, der ikke ere synderlig fremspringende, naar Dyret 

 er helt udstrakt og i fuld Vigør, sees en Række koniske 

 Papiller, som især blive tydelige under Kontraktionerne, 

 hvorved de ligesom fremskydes. De staa dels enkeltvis 

 efter hverandre, dels sees to ved Siden at' hinanden, og da 

 blive Længderækkerne paa de Steder noget undulerende. 

 Tab. XX, Fig. L a. Hvorvidt disse Papiller kunne ind- 

 drages. kan jeg ikke afgjore. da jeg ei har iagttaget en 

 saadan Bevægelse; men at de under Kroppens Kontrak- 

 tioner skydes stærkt frem, er sikkert; de blive da mere 

 koniske, og paa deres Spids sees ved Hjælp af Loupen en 

 vderst fin Aabning. 



Physa danner en ægformig, aldeles vandklar Blære, 

 med 8 lidet fremtrædende Limer, der ere Fortsættelser af 

 Ribberne paa Scapus, og paa hvilke lignende Papiller sees. 

 men som staa meget mere spredte end paa Scapus, Tab. 

 XX. Fig. 1 b. Den er udstrakt 10""" lang. 8""" bred. og 

 kan fuldstændig inddrages i Scapus. 



Capitulum er 1-1""" langt. 6""" bredt, lidt smalere op 

 imod Mundskiven. Det er cylindrisk, fuldkomment vand- 

 klart og saa gjenneinsigtigt. at Svælgrørel godt kan sees. 

 Det hai- ligesom Physa 8 fine Længdelinier. der opad ere 

 Fortsættelser af Ribberne paa Scapus, og sum ligeledes ére 

 forsynede med spredte Papiller, Tab. XX. Fig. 1 r. Disse 

 Limer, som strække sig opad til Mundskiven, dele sig der 

 og omfatte Tentaklernes Grund. Mundskiven noget hvælvet. 

 og paa dens Midte iagttages en lidt aflang Mundaabning, 

 som under Kontraktionerne bliver rund og danner da paa 

 Grund af de foldede Læber en Roset. Tentaklerne, hvoraf 

 der er 12, staa i en Række, ere retraktile, 16 — 20""" 

 lange, tynde, meget tilspidsede, vderst let bevægelige og 

 trække sig meget hurtigt ind ved ilen letteste Berørelse. 

 Ved en pludselig Overraskelse boies Tentaklerne hurtigt 

 ned i Svælgroret, som da med Capitulum inddrages i 

 Scapus. 



Farven: Scapus er grøn med enkelte brungule Par- 

 tier. Det er egentlig det skedeformige Overtræk. som har 

 denne Farve; thi den egentlige Cutis er aldeles farveløs. 

 Capitulum er vandklart, fuldstændigt gjenneinsigtigt, saa at 



Dr. Angelo Andres. 



Edwardsia Andresi. l n. sp. 



pi. v, fig. r.; pi. xx. 



When in extended condition the body. including the 

 tentacles. measures 90""" in length. 



Tlie scapus is cylindrical, 50""" in length. 8 — 10""" 

 in breadth at the media.l portion, and is furnished with 

 8 longitudinal ribs. It has a thin. but finn. membranous 

 covering, which forms a closely-fitting sheath (Pl. V, fig. 5; 

 Pl. XX. fig. 1) into which both the extremities of the 

 animal may be withdrawn. Upon the ribs. which are not 

 particularly prominent when the animal is fullv extended 

 and in full vigour, a series of conical papillæ is visible, 

 which become especially distinct during the contractions. 

 which, cause them, as it were. to be projected. They are 

 placed, partly singly. one after the other, partly two along- 

 side each other. and in thai case the longitudinal series 

 become somewhat undulating (Pl. XX, fig. 1 a). Whether 

 these papillæ are capable of retraction or not I have been 

 unable to determine, as I have not observed such a move- 

 ment. but it is certainly the case that during the contrac- 

 tions of the body they are strongly projected ; they become, 

 tlien. more conical, and at their point an extremely minute 

 apei"ture may be seen with the aid of a magnifying glass. 



The physa forms an ovate. almost translucent vesicle 

 with 8 little-prominent lines, which are prolongations of 

 the ribs of the scapus, and upon which similar papillæ as 

 on it are visible, but here they are placed much more 

 spread than on the scapus i Pl. XX. fig. I 1>). When ex- 

 tended it measures 10""" in length and 8""" in breadth. and 

 it may be completely withdrawn into the scapus. 



The capitulum measures 14"' in length and i>""" in 

 breadth, but is a little narrower up towards the oral disc. 

 It is cylindrical. perfectlj translucent. aud so transparent 

 that the gullet-tube maj easilj bi' si-en. It has. like the 

 physa. 8 tine longitudinal lines that. at the top, are pro- 

 longations ot' the ribs of tin- scapus, aud which are also 

 furnished with scattered papillæ (Pl. XX. fig. 1 c). These 

 lines, which extend themselves upward to the oral disc, 

 divide here and enclose the base of the tentacles. The 

 oral disc is somewhat arcuate, and in its middle is observed 

 a slightly oblong oral aperture, which during the contrac- 

 tions becomes round, and forms then. owing to the folded 

 labiæ, a rosette. The tentacles. of which there are 12. 

 are placed in one series; they are retractile, 16 — 20""" in 

 length, thin. very acuminate, and extremely mobile: and 

 they withdraw themselves with great rapidity at the slight- 

 est touch. On a sudden surprise the tentacles are bent 

 quickly down into the æsophagus, which. with the capitulum, 

 is then withdrawn into the scapus. 



The colon r. The scapus is green with a fe w brown- 

 ish yellow patches. Properly speaking it is the vaginate 

 covering that has this colour, as the cutis-proper is per- 

 fectly colourless. The capitulum is pellucid, and perfectly 



lir. Angelo Andres. 



