■WORMS, ETC.

505

Maricolae, Oersted regards the structure of the intestinalcanal, the number of the segments of the body, and theform of the branchiae. Thus he institutes the followingsub-orders and families : (1) Sub-order, Ciuetopoda, withthe three families, Chaet. trematodina, vera, and terricolina,each family with two sub-families, viz.: the Amphinomacese,Aphroditaceae, Euniceae, Nereidae, Arenicolae, and Ariciae;whilst (2) the sub-order, Acii.eta, contains only the familyPeripateae. Of these families, Oersted has given a moreparticular exposition of the 'Ariciae, to which have beenadded the new genera, Bisoma, Sphcerodorum, Dodecaceria,Ophelina, and Eumenia. (Archiv, 1844, Bd. i, p. 103.) Hehas also commenced the description of the Danish Annulati,beginning with the Maricolae. (Annulatorum danicorumconspectus. Pasc. i. Maricolae. Hafniae, 1843.) Of the 48Danish Maricolae enumerated by him, 23—24 species arenew, viz.: Lepidonote assimilis, Pholo’e baltica, Heteronereisfucicola, and viridis, Nereilepa variabilis, and fusca, Nereiszostericola, Notophyllum viride, and longum, Eulalia pusilla,sanguinea, Eteone Sarsii, maculata, pusilla, Phyllodoce assi-milis, mucosa, groenlandica, Nephtys borealis, assimilis,Goniada alba, Leucodorum caecum, Bisoma multisetosum,Spharodorum flavum, Bodecaceria concharum, Ophelia mamil-lata, Ophelina acuminata, Eumenia crassa, and further,Chatopterus, new species, but so mutilated that the animalcould not be determined by Oersted. For the new genusHeteronereis, allied to Nereilepa, Blainv., he has assignedthe following characters: Corpus ex duabus partibus etforma et appendicibus valde discrepantibus constans, parteanteriore tereti appendicibus ut in Nereidis genere praedita,posteriore vero depressa; in hac, segmenta multo breviora,mamilla branchiali ad basin cirri superioris, lamella apicipinnae inferioris, cirro inferiore mamillse bipartitse affixo.Setae partim cultratae, partim spinosae. The new genus,Notophyllum, allied to Phyllodoce, is characterized as follows :Corpus lineare depressum ; caput cordatum ; tentacula 4 ellip-tica in apice capitis, cirrorum tentacularium paria 4 ; oculi