36 



glat uden Tænder (T. V, Fig. 9). Børsterne ere som hos 

 den foregaaende Art ens i alle Led, nemlig lange og tynde 

 glatte Haarbørster (T. V, Fig. 17) og desuden i hver af 

 de ventrale Knuder et Bundt gaffelformede Borster (T. V, 

 Fig. 15. ft), af samme Form. men noget storre end de til- 

 svarende hos foregaaende Art (T. V. Fig. 16). 



Gaffelformede Borster omtales af Malmgren som fore- 

 kommende hos Ewmenia crossa. De rindes ikke alene hos 

 denne, men ogsaa hos Scalibregma inflatum. De hos Eu- 

 menia forekommende ere dog meget tykkere og have længere, 

 i Spidsen stærkt udadbøiede Tænder. og dertil er den ene 

 Tand rint sagtandet et Stykke langs den indre Rand ved 

 Basis (T. V, Fig. 18). Hos Scalibregma inflatum ere de 

 tyndere og Tænderne ikke saa lange, samt glatte (T. V, 

 Fig. 19). Hos begge disse Dyr sidde disse Borster i et 

 eget Blindt og kun den gaffelformige Spids rager udenfor 

 Fodknuden. 



Alene Forekomsten af denne eiendommelige Børste- 

 form hos de to beskrevne Dyr vikle være nok til at vise. 

 at de henhørte til Scalibregmidæ. Kropsformen hos begge 

 Arter stemmer mest med den hos Scalibregma og fornem- 

 melig Hovedlappens Form og hos den sidste tillige For- 

 knudernes paa Bagkroppen; den mangler rigtignok Branchier, 

 men da vi vide. at disse ogsaa mangle hos unge Individer 

 af Ewmenia crossa, saa tor vel det samme kunne være Til- 

 fældet hos unge Exemplarer af Scalibregma. Og for den 

 første Arts vedkommende tor det vel være. at de mang- 

 lende Fodknuder har fondets paa den manglende Del af 

 Dyret; her fandtes kun 13 Led og hos den anden optraadte 

 Fodknuderne første paa 12te børsteførende Segment. 



Ammotrypane cylindricaudatus, n. sp. 

 Stat. 31, 87. 



2 Exemplarer, 5 ctm. lange og 1""" brede (T. VI. 

 Fig. 20). Hovedlappen spids med to Grruber paa Over- 

 fladen, mellem hvilke Huden rager frem 'som en Kol (T. VI, 

 Fig. 21). Mundaabningen paa Undertladen. Ved forste 

 Borstebundt ingen Branchie; derimod rindes en Branchie 

 paa hver Side af de følgende 6 Led; paa de derpaa fol. 

 gende 2<J Led mangle Branchier. men optræde igjen paa de 

 3 næstsidste Led foran den eiendommelige Bagende (T. VI, 

 Fig. 22). Kropsformen foran denne er den samme som 

 hos Ammotrypane auhgaster med 2 Valker langs Bugtladen 

 og Borster og Branchiergsiddende i den dybe Fure mellem 

 Valkene og Kropsvæggen (T. VI. Fig. 24). Etter det 

 sidste Borstebundt i denne Fure folge 4 Led med ordent- 

 lige Fodknuder (T. VI. Fig. 22) der ere forsynede med 2 

 Børstebundter. Fodknuderne danne som en Fortsættelse 



from beneath the head; it was quite smooth, without teeth 

 (Pl. V. rig. 9). As in the foregoing species, the bristles 

 are uniform on all the segments, viz. long, slender, smooth. 

 and capilliform (PL V, rig. 17); each of the ventral 

 protuberances having besides a fascicle of furcate bristles 

 (PI. V. rig. 15, ft), similar in form, but somewhat larger 

 than those corresponding with them in the foregoing species 

 (PI. V. rig. 16). 



Furcate bristles occur, according to Malmgren, in 

 Eumenia crossa. They are met with not only in this 

 animal but also in Scalibregma inflatum. Those in Eumenia 

 are, however, considerably thicker, and have longer teeth. 

 curving outwards: moreover, one of the teeth is finely 

 dentate along part of the inner margin at the base (PL V. 

 rig. 18). In Scalibregma inflatum they are more slender; 

 the teeth, too. are smooth, and not so long (PL V. fig. 19). 

 In both animals these bristles are arranged in a separate 

 fascicle, the furcate point only projecting beyond the pedal 

 protuberance. 



The occurrence of this peculiar form of bristles in 

 the two animals described, is in itself sufficient to show 

 their relationship with the Scalibregmidæ. The form of the 

 body in both species bears the closest resemblance to that 

 distinguishing Scalibregma, more especially as regards the 

 lobe of the head and the posterior pedal protuberances; 

 true, branchiie are wanting, but. since these organs do not 

 occur either in young specimens of Ewmenia crossa, the 

 same may be the case with young individuals of Scalibregma. 

 And as regards the first species, the pedal protuberances, 

 absent in the defective specimen, possibly did occur on the 

 missing part of the animal; at least, I counted only 13 

 segments, and in the other species the pedal protuberances 

 do not commence till on the 12th bristle-bearing segment. 



Ammotrypane cylindricaudatus, n. sp. 



Stats. 31, 87. 



Two specimens, measuring each 5 1 " 1 in length and 

 1""" in breadth (PL VI, fig. 20). The lobe of the head 

 pointed, with two fovea? on the surface, between which the 

 skin presses up like a keel (PL VI, tig. 21). The buccal 

 aperture on the under surface. No branchia at the first 

 fascicle of bristles, but the 6 following segments with a 

 branchia on either side : branchiae wanting on the 20 suc- 

 ceeding segments, but again present on each of the 3 

 immediately preceding the peculiar posterior extremity (PL 

 VI. rig. 22). The form of the body anterior to the latter the 

 same as in Ammotrypane aulogaster, with two longitudinal pro- 

 minences along the ventral surface, branchiae and fascicles of 

 bristles occupying the deep furrow extending between the pro- 

 minences and the wall of the body (PL VI. rig. 24). The ter- 

 minal fascicle in the said furrow is succeeded by 4 segments. 



