23 



for, at kun et Septum frembringer Testikler, da disse, der 

 beståa af en Mangfoldighed af Blindsække, nok ere istand 

 til at producere en tilstrækkelig Mængde Spermatozoer til 

 Æo-genes Befrugtning. Som bekjendt korrespondere jo alle 

 Kamre med hverandre, saa at der egentlig ingen Hindring 

 er, for at Spermatozoerne kunne vandre rundt om og fuld- 

 føre sit Befrugtningsarbeide. 



Paa Kroppens indre Væg, Huvs. nu paa Septa, ere 

 Længdemusklerne langt mere udviklede end Tvermusklerne ; 

 kun opimod den øverste Rand tiltage disse sidste betydeligt i 

 Tykkelse og bidrage til at danne den fremstaaende, kre- 

 nulerede Kropsrand. 



Parieto-basilarmuskelen er tyk, strækker sjli et temme- 

 lig langt Stykke op paa Kropsvæggen, hvor den bliver meget 

 tyndere, ligesom den næsten membranagtig udbreder sig 

 noget paa Fodskiven. Paa dennes indre Plade. der danner 

 Bunden af Gastralhulheden. sees de fuldstændige Septa, 

 saavelsom de af 2den Orden, at tåge deres Begyndelse fra 

 Centrum med to adskilte Blade. imedens Septa af 3'lie 

 ( >rden langtfra naa hen til Centrum af Fodskiven. 



Findested. 



•Station 33. -i Exemplarer, der alle sad paa levende 

 Exemplarer af Neptunia curta. Jeffr. (Friele). 



Slægtskarakter. 



Fodskiven omfattende store Gjenstande. saasom Nep- 

 tunia curta, Jeffr., med en tyk, ombøiet Rand. Kolumnen 

 cylindrisk, foldet paatvers med en fritstaaende, øverste 

 Rand (Parapet) og spredte Cinclides. Tentaklerne faatal- 

 lige, korte, retraktile. i faa Rekker. Sex fuldstændige golde 

 Septa. Ingen Aeontier, Udprægede mesodermale Cirkulær- 

 muskler. Hermaphroditer. 



Jeg har henført denne Slægt til Familien Sagartidæ, 

 ihvorvel den mangler Aeontier, som ifølge Rieh. Hertwig 

 er en af de to væsentligste Karakterer for Familien. Men 

 da den forresten har saa meget tilfælles med Sagartiderne, 

 og da andre Forfattere, især Dr. Angelo Andres, ikke 

 læggo saa overordentlig Vægt i systematisk Henseende paa 

 Acontiernes Tilstedeværelse, har jeg troet mig berettiget 

 dertil. Skulde det senere vise sig, at Acontierne ere et 

 uundværligt Familiemærke for Sagartiderne. faar man flytte 

 den over i en anden Familie, eller lade den danne en ny. 



possibly the rudimentary testicle. There is. however, of 

 course, the possibility that only one septum produces testi- 

 cles, as these ccuisist of a multitude of cæca, and are cer- 

 tainly capable of producing a sufficient abundance ut* sper- 

 matozoa for the fructification of the ova. As is already 

 known, all the chambers correspond with each other, so 

 that there is really no obstacle to prevent the spermatozoa 

 from circulating round about and completing their work of 

 fructification. 



On the inner wall of the body, as also mi the septa, 

 the longitudinal nmscles are far more developed than the 

 transversal muscles; only up towards the uppermost margin 

 do these last increase considerably in thickness, and con- 

 tribute to the formation of the crenate, protuberant margin 

 of the body. 



The parieto-basilar muscle is thick, and extends itself 

 rather a long way'up the wall of the body, where it be- 

 comes much thinner, whilst, also, it a lun ist membranaceously 

 distributes itself somewhat on the pedal disc. On the 

 inner surface of the pedal disc. which fonns the bottom 

 of the gastral cavity, the perfect septa, as well as also 

 those of the 2nd order, are seen to issue from the centre 

 with twp separate lamellæ, whilst the septa of the 3rd order, 

 do not at all approach to the centre of the pedal disc. 



Habitat. 



Station No. 33. Four specimens, all which were 

 seated on living specimens of Neptunia curta, Jeffr. (Friele). 



Generic eharacteristics. 



The pedal dise embracing large objects, such as 

 Neptunia curta (Jeffr.), with a thick margin bent inwards. 

 The eolumn cylindrical, folded transversally, has a free 

 erect superior margin (Parapet). and scattered cinclides. 

 The tentacles not numerous. short, retractile, in few series. 

 Six perfect, sterile septa. No acontia. Prominent meso- 

 dermal circular muscles. Hermaphroditic. 



1 have assigned this genus to the family Sagartidæ 

 although it is deficient in acontia which, according to Rich. 

 Hertwig, is one of the two most distinctive eharacteristics 

 of the family. But as it, otherwise, has so much in com- 

 inon with the Sagartidæ, and as other writers, especially 

 Dr. Angelo Andres, do not lay such great systematic 

 stress on the presence of the acontia, I have considered 

 myself warranted in so assigning it. If it should, subse- 

 quently, appear that the acontia are an indispensable family 

 characteristic for the Sagartidæ, then it can be trans- 

 ferred to another family, or a new one can be formed 

 for it. 



