37 



at' Bugvalkene og deres Børster ere meget talrige (T. VI, 

 Fig. -?<>). kortere og tykkere (Fig. 27) end de paa den 

 øvrige Del af Kroppen (Fig. 25) og tillige let bruntfarvede, 

 medens disse ere farveløse. Bag disse fire Led kommer et 

 3 — 4""" langt, glat Rør, som mod Enden er lidt opdrevet 

 paa Dorsalsiden og her ender med en liden Tap. der 

 hænger udover den kortere, brede Underlæbe for Analaab- 

 ningen (T. VI. Fig. 22). Korets Overflade er tværfuret 

 over Rygfladen og begge Sideflader; paa Bugfladen deri- 

 mod tindes der to longitudinale Folder som Fortsættelse af 

 Bugvalkene (T. VI. Fig. "23). Ved at komprimere denne 

 Del og undersoge den under Mikroskopet sees den at være 

 beklædt af en Chitinhud, der gaar i et med Kroppens; den 

 er desuden forsynet med et Lag King- og et Lag Længde. 

 muskler og inde i Roret kan Tarmkanalen skimtes. Hos det 

 ene Exemplar manglede dette Ror (T. VI, Fig. 2*). 



Hvad enten nu dette er en udkrængbar Analtrakt, 

 der kan trækkes ind i Kroppen eller den altid er ude. saa 

 er den tilligemed de 4 fodknudebærende Led saa mærkelig, 

 at Dyret kanske rigtigst burde henføres til en ny Slægt- 

 men da det forresten viser saa stor Overensstemmelse med 

 Ammotrypane aulogaster, har jeg foretrukket at henføre det 

 til samme Slægt. 



Sphærodorum abyssorum, n. sp. 



Stat. do. 



Et mindre vel bevaret Exemplar, ca. 1 ctm. langt. 

 tilspjdset i begge Ender (T. VI. Fig. 16). Chitinhuden 

 er losnet over hele Bagenden. og ogsaa hist og her ellers. 

 Dyret har mest Lighed med Ephesia gracilis. Det har 

 som denne smaa klare Papiller paa Ryg- og Bugfladen; 

 tiere saadanne tindes ogsaa paa hver af de kugleformige 

 Rygcirrer (T. VI. Fig. 18), der ere fy kite med Celler, fuld- 

 komment afgræudsede fra det øvrige Hypoderm. men hvis 

 nærmere Anordning paa Grund af Præparatets Tilstand ei 

 kan udredes. Ogsaa paa Enden af Fodknuderne tindes 

 Papiller, og disses Børster række noget længere frem end 

 hos Ephesia gracilis; der er som hos denne en Acicula i 

 hvert Børstebundt. De 4 — 5 andre Horster ere sammen- 

 satte: paa den bredere skraat afskaame Ende sidder en 

 liden tvnd. krammet Spids (T. VI. Fig. 19). Lignende 

 Borster rindes hos den af Graff i Ann. & Mag. of Natural 

 History Vol. XX beskrevne Sphærodorum Claparedi. 



with true pedal protuberances (Pl. VI, rig. 22), bearing 

 two fascicles of bristles. The pedal protuberances may be 

 regarded as a. continuation of the ventral prominences; their 



bristles are exceedingly numerous (PI. VI, tig. 26), shorter 

 and thicker (tig. 27) than those occurring elsewhere on the 

 bodj i tig. 25), and of a lightish brown, whereas the latter 

 are colourless. Posterior to these 4 segments is seen a 

 smooth lobe, o'""' — 4""" long, somewhat raised at the extremity 

 on the dorsal side, and terminating there in a slender spigot- 

 shaped projection reaching out over the broad and com- 

 paratively short nether lappet of the anal opening (PI. 

 VI. rig. 22). The lobe is transversely striated both on the 

 doi'sal and the lateral surfaces, whereas on the ventral 

 surface occur two longitudinal folds, protending from the 

 ventral prominences (PI. VI. Fig. 23). On compressing this 

 tube and examining it under the microscope, it is found to 

 be invested with a chitinous integument coalescing with that 

 of the body; moreover, it has a layer of annular and a 

 layer of longitudinal muscles, and within the tube can be 

 discerned the intestinal canal. In one of the specimens 

 the tube was wanting (PI. VI, rig. 28). 



Xow, whether this tube be an exserted anal tract 

 admitting of being invaginated into the body, or whether it 

 be non-retractile, it certainly constitutes, along with the 4 

 pedal protuberances, so remarkable a character, that a 

 new genus should, perhaps, be established for the reception 

 of the animal; but. possessing as it does, so much in 

 common with Ammotrypane aulogaster, I have nevertheless 

 referred it to the same genus. 



Sphærodorum abyssorum, n. sp. 



Stat. 33. 



A somewhat mutilated specimen, L'" in length, with 

 acuminate extremities iPl. VI, rig. lti). The chitinous 

 integument was detached over the whole of the posterior 

 part, and here and there also in other places. This animal 

 hears most resemblance to Ephesia gracilis, and is. in 

 common with that form, furnished with small, transparent 

 papillæ on the dorsal and ventral surfaces; several papillæ 

 of the same kind occur, too, on each of the globular dorsal 

 cirri (PI. VI, tig. 18), which are composed of cells, per- 

 fectly distinct from those in the remaining portion of the 

 matrix; their arrangement could not. however, be distin- 

 guished owing to the bad state of the specimen. Papillæ 

 also occur at the extremity of the pedal protuberances, 

 whose bristles reach a trifle farther out than do those in 

 Ephesia gracilis : as in that form, each fascicle is furnished 

 with an acicula. The remaining bristles (4 or 5) compound ; 

 at the broad, obliquely truncate extremity is seen a small, 

 slender, arcuate point (PL VI, rig. 19). Similar bristles 

 occur, according to Graff (Ann. & Mag. of Natural History, 

 Vol. XX). in Sphærodorum Claparedi. 



