ANNULATA DISCOPHOEA. 17 



The zoolog;ioal museum of the uni\^ersity to Helsingfors 

 possesses a specimen of this animal noted: Ishavet (the nor- 

 thern frozen ocean) Kola, bv mr G. Selin ! 



C. costata, Fr. Miill. Caput discretum. Corpus subcar- 

 t iJayineum, dilatatiim, fusceseens. Dorsum convexiuseulum vitta media 

 lomjitudinali fktra. nigro interrivpta, Uneisque punetorum ohscuriorum 

 prominenfibus utrinque binis fermsque quasi costafwn. Oculi ij subro- 

 tundi. Long. 40 — -50 m. m. 



Sgii. Clepsiae costata, Fr. Miiller 1846 p. 82; (rrube 113 c& 150; 



Diesingl. 450; Kessler j]3. 

 Glossiphouia catenigera, Moquin-Tandon 373. 

 Clepsine catenigera, Diesing "W. S. B. 33 p. 493. 



Habitat: ad insulam Valamo in Ladoga (Kesslerj. 



Nota. Ordini Myzhelminthorum, sec. Diesing, subordini 

 Bdellideornm, tribui Monocotyleorum subtribuique Calicotyleo- 

 rumadscribo animalculum quod Lumbriculo variegato adhaerens 

 inveni; cujus corpus segmeutis viij confectum acetabulo anali 

 praeditum spinis duabus retrorsum directis instructo. Extremi- 

 tas cephalica acetabulo destituta, ciliis autem vibratilibus obsita. 

 Oculi miUi. latestina inconspiciia. Segmentum quintum caete- 

 ris majus ampliusque, adeo ut animal irritatum, Testudinum more, 

 totum corpus in idem eontrahere possit. Longit, 0,2 m. m. 



Obs\ The late professor Alexander von Nordman once 

 toid he had got specimens of Branchiobdella astaci; however 

 the Zoological museum of th(» Helsingfors-university does not 

 possess any. 



Fam. ACANTHOBDELLEA, Grube (et genus tamiliae unicum). 



Acanthobdella, (jrube. Corpus fere fusiforine. depress mscuhim, 

 antrorsum sensim attennatum; ibidem setae ■uncinatac per paria aliquot 

 biseriatim posifae. Lobus eeplialicus /"Kinberg; Kopflappen. Grube^ exi- 

 guus I. inconspieuus, minimeque acetabulum form,at, mide aeetabulum 

 anticum mdlum. Os inferum, subterm,inale, mimm-wm. Aperturae g e- 

 nitales solitariae, approxhnatae, in linea ventris meAiana. antieani ver- 

 sus extremitatem sitae — in XXXI et XXXIl segmento, sec. Diesing. — 

 Aeetabidwm anale mimd.uni, cuju.^ in medio or i fid inn ani. Srgmmia. 

 corporis cireiter Ixxx. 



