WORMS, ETC. 505 



Maricola?, Oersted regards the structure of the intestinal 

 canal, the number of the segments of the body, and the 

 form of the branchiae. Thus he institutes the following 

 sub-orders and families (1) Sub-order, CH/ETOPODA, with 

 the three families, Chset. trematodina, vera, and terricoliiia, 

 each family with two sub-families, viz. : the Amphinomacere, 

 Aphroditacere, Eunicese, Nereidse, Arenicolse, and Aricise ; 

 whilst (2) the sub-order, ACH^TA, contains only the family 

 Peripatese. Of these families, Oersted has given a more 

 particular exposition of the Aricire, to which have been 

 added the new genera, Disoma, Splmrodorum, Dodecaceria, 

 Ophelina, and Eumenia. (Archiv, 1844, Bd. i, p. 103.) He 

 has also commenced the description of the Danish Anuulati, 

 beginning with the Maricobe. (Aunulatorum danicorum 

 conspectus. Fasc. i. Maricolse. Hafnire, 1843.) Of the 48 

 Danish Maricolae enumerated by him, 23 24 species are 

 new, viz. : Lepidonote assimilis, Pholo't baltica, Heteronereis 

 fucicola, and viridis, Nereilepa variabilis, and fusca, Nereis 

 zostericola, Notophijllum viride, and longum, Eulalia pusiUa, 

 sanguined, Eteone Sarsii, metadata, jmsiUa, PhyUodoce assi- 

 milis, mucosa, groenlandica, Nephtys borealis, assimilis, 

 Goniada alba, Leucodorum caecum, Disoma multisetosum, 

 SpJuerodorum flavum, Dodecaceria concharum, Ophelia mamil- 

 lata, Ophelina acuminata, Eumenia crassa, and further, 

 CluBtopterus, new species, but so mutilated that the animal 

 could not be determined by Oersted. For the new genus 

 Heteronereis, allied to Nereilepa, Blainv., he has assigned 

 the following characters : Corpus ex duabus partibus et 

 forma et appendicibus valde discrepautibus constans, parte 

 anteriore tereti appendicibus ut in Nereidis genere prasdita, 

 posteriore vero depressa ; in hac, segmenta multo breviora, 

 mamilla branchial! ad basin cirri superioris, lamella apici 

 pinna? inferioris, cirro inferiore rnamillae bipartite affixo. 

 Setse partim cultratas, partim spinosse. The new genus, 

 Notophyllum, allied to Phyllodoce, is characterized as follows : 

 Corpus lineare depressum ; caput cordatum ; tentacula 4 ellip- 

 tica in apice capitis, cirroram tentacularium paria 4; oculi 



