OLIGOCHAETA. 23 



Habitat iw aqtiosis, ripis etc. baud rarus; agilis. — Fager- 

 vik, Ekenas, Helsinge, Maotsala; Parikkala (J. Sahlberg). 



In ^ForhancUiagar vid de Skandinaviske Natm-forskarenes 

 2 iu6te» pag. 273, prof. Boeek tells that he has found in Nor- 

 way six species of Lumbricas; of them three were found in 

 the en\n[rons of Troudhjem and only one at Hammerfest. At 

 the same leisure D:r Beck told himself to have found eleven 

 diiferent species in the environs of Lijmfjorden. — Savigny 

 (Cuvier. Histou'e des progres) describes twenty species. 



Fam. TUBIFICINA, d'Udek. Corpus anmilatum. Lotus eephali- 

 eus ill labricm superkis, interditm ralde longum produchcs. Segrnenta 

 eorporis numerosissiina. Tegumenta corporis musculosa, admodmn pel- 

 lucida. Series fascieulorum setarum ji\ setae out uneinatae, aid furca- 

 tae; mterdwm in eodem fascieulo reperiimtur setae et siobulatae [capilli] 

 ef fureatae. Tubus ryibarius rectus. Os segmento buccali inferius. Ven- 

 triculus museulosus deest; anus terminalis. Apparatus cireulationis aut 

 cordibus ij later alihus, aut r a/mis later alibus; ratni vasorum sacculis 

 coeds contractilibus termiiwH. Sanguis ruber I. lufeoruber. Ovula pro 

 exiguo corpore permagna, plura in capjsulis eonglut inata . Aquarutn et 

 dtdcium et suhsaUnarum incolae. 



A. Setae fiu'catae; rami vasorum indivisi. 



Tiibifex. Fasciculi setarum super iores setis gati/l cut furcatis I. 

 furcato-pectinatis, interdiim eapillis inte.nnixtis. R%mi vasorum in 

 VIII seg)ncnto in cordo, transformati* 



a. Tegumenta nuda; sanguis ruber. 



aa. Fasciculi setarum capillis /■ setis subulatis) destituti. 



* A. S. Oersted (De regionibus marinis, Hauniae 1844 p. 6S) gives 

 to the genus Tubifex limits, that seem to me to be preferal^le to those of 

 d'Udekem: sTubificis genus differt a Lumbricillo praecipue setis dorsahbus 

 partim capiUaribus, partim u.ncinatis». — Thus the gxoup a — a a might be 

 disunited from that genus and. together with Euaxes and Lumliriculus. (irube. 

 and Helodiilus, Hoffm.. transferred into the -familia Lambricillorum , Oerst., 

 whose nota eharacteristica is given in the following words : XumbriciUus, 

 Lumbiicillorum familiae tj^pus, distinguitm- setis et superioribus et inferiori- 

 bus subulatis, abbre\-iatis ferme rectis>. However, as Oersted does not men- 

 tion the relation of the blood-vessels, one cannot have regard for the limits 

 given by him. — I also think it necessary to mention, that I have l)een 

 imabled to further investigations about Tubificina, Enc-hytraeina and Nai'dina, 

 after that time as I got the papers of Diesinu', d'T'dekem. Olapanxle and 

 Ratzel. 



