OLI(U3CHAELA. 25 



q/Mrum hi aplce aperturar geiiifales. Fasciculi siiperiores bini segment- 

 onirn II — JX capiUos coiiiplectimtiir fcnwi<-([iiaternos setasque ftireato- 

 pcctinafas [ad formcim pectinh pediceUati] (luinos I. senos ; fasciculi 

 infer iorcK qvaferni in segvienfis octo anterioribits setis gattdent terms; 

 cacfcri fasciculi ef dorsales et vputralcs binix tanfimi : capilli corporis 

 diamefro pares. Long. 28, latif. 0,6 — 0,8 m. id. 



Sgn. Saenufis umbellifci-a. Kt^ssler 107. 



T. -lousi'ioauda, Kessler. Lobus ceplialicus prominiilo-coniciis, su- 

 pra segniento buccali coiitimms. Exfremitas posfica valde prochicta af- 

 tciiiiata(p(e. In anferiore corporis extrpmitate fascictoli dorscdes capiMos 

 complecUinfiir longos setasque fiircatas. Ntimeriis setarimi in singulis 

 fasciculis retrorsimi decrescit. Color alhidiis. Long. 60 — 75, latit. 

 antiee 0,3 m. m. 



Sgn. ■ Saenuris longicauda, Kesslev 107. 



Habitat ad ligna submersa. — In rivulo Poventshanka 

 legit Borsdinski, .sec. Kessler. 



T. Bonnetii, I'lap. ["?] 1. veiTiieosus*. Corpus totmn rerrucis 'mi- 

 nimis opacis densissime adspersu/m., tit intera/nea vix conspicere possis. 

 Lobus cephalieus segmento buccali contimms, deorsum inclinatus ; totus 

 una cum segmento buccali retractilis, perpcorvus. Pars corporis ante 

 cingukim idem versus aliquantum increscit, pone cingulum sensiin at 

 conspicue decrescit. [Cingulum X — XIV, XV; segmenta v vet vj com- 

 plect itur.] Segmenta inter se longitiulineinaequalia; media scilicet ante- 

 rioribus, nee non posterioribus multo longiono; antica omniumi brevis- 

 sima ; postica mrrucis sparse obtecta.., annulis quinis dsnis minor i bus sub- 

 divisa. Segmenta corporis cireiter Ix [I. x^h^ra], Oeuli nulli. [Aper- 

 turarum genitaiium in cingulo par vix conspicuum,] Fasciculi superiores 

 bini capillos ternos senos setasciue intermixtas furcato-pectinatas gerunt ; 

 inferiores autem bini setas furcatas ternas-quafernas qimdranti longi- 

 tudinis capillorum aequales; capilli corporis latitudine breriores; setae 

 furcato-'pectinatae verrucis cutaneis parum. longiora. Intestinum sitn- 

 plex; rasa aegre conspicua, sanguis ruber, translucens animal reddit 

 rosaceo-albmn. — Ad extremitatem, posticam quoriindam individuorum 

 appendices observari clavi formes, pedicellatas. [Infusoria generis Vorti- 

 cellina, sec. Kessler.] Long. 20- -25, latif. 0,9 m. in. 



Sgn. Tubifex Bonneti, Claparede 1862. 



Nais papillosa, Kessler 105. 



Habitat in limo ligna submersa obtegenti una cum Tubi- 

 ficide elongate, eodem aliquanto frequentior. Aquarum dulcium 

 incola. Anticam extremitatem e limo exsertam perpetuo motitat, 

 irritatus autem subito retrahit. — Helsinge, Mantsala; La- 

 doga (Kessler). 



Obs! There is no doubt about the Nais papillosa, 

 Kessler, being quite corresponding to the species above. Kessler 

 has likely omitted the short forked bristles, scarcely surpassing 

 the cuticular warts; those bristles besides one does not see 

 otherwise than at 600 times magnifying. For the rest the 

 description given by K. is striking. 



