14 ANNULATA DISCOPHORA. 



eirculare I. subelUpticuTn, parum exeavatum, excenfrice affixum,, corpori 

 contimmm I. discrettim; acetabulum anale rix discretum, excentrice af- 

 fixum, abdotnine latius. 



P. plscium, Bergm. G. teres fusco-flavum, viride I. cinereum, ti- 

 nea longitudinali mediaiia ntrinque pinnata alba, Oeellijv, quorum an- 

 teriores distantes, lineares. Aperture genitales in XXVIII et XXXIV 

 {XXIX et XXX) segmento. Aeetabulum anale supra obesure radiaturn 

 et intra tnarginem cireulo unieo punetis nigris notatum. Long. 45 m. 

 m., lat. 4 m. m. 



Syn. Hirudo teres extremitatibus dilatatis, Linne F. 8u. I M 1275. 

 Hirudo piscium, Bergman 1757; 0. F. Mliller i. ii. 43; Fabricius 



F. Groenl. 321 e. p. 

 Hirudo geometra, I.inae, S. Nat. X. 650; F. Su. n 506 M 2083; 



S. Nat. xm 3097; Johnson 35. 

 Hirudo Galeria, Braun 35. 



Piscicola piscium, Moq.-Tandon 294; Malm 229. 

 Ichtiobdella geometra, Diesing i. 440. 

 Piscicola geometra, G-rube 112; G. Johnston 43 (with eight eyes!"?). 



Habitat in aq-ois dulcibus, nee non subsalinis fere ubique 

 — Runsala, Helsingfors, Helsinge. 



Obs\ I do not yet possess facts enough for to decide 

 whether this one and its confined species (Malm op. cit.) really 

 are good species or merely varieties. In subsaline water I have 

 got individuals, as for the colour, ressembling to the » gracilis », 

 » piscium » and »crassicaudata» of Malm; the type of » piscium, 

 Malm» I have found only in fresh-water (Vanda-river). — A 

 specimen corresponding to » crassicaudata, Malm» ^vithin except 

 of the eyes, I caught in brackish water on a Cottus gobio, 

 Lin.; when keeping up the animal alive for a few days 

 I saw the red colour, by degrees, changes into light yellow. 



P. stellata, KoUar-Diesing. G. depressum, obsolete annulatwn, ut- 

 rnqiie margine papillosuui, ciiiereo-album, ptmetis stellatis nigris undique 

 adspersum. Oeiili jr. nntici lineares, postiei suhrofundi, minores. Golhim 

 suhcuiiicuin limid papillosunr., acetahulu/u eorpvri concolor, litnbo eelhdis 

 )jHij(iriliiis rlij — .)■ einrtum. (Sacei roitralcs mnitrs antice quasi bipar- 

 fiti; Mahn.) Long. 18 m. m.., lat. 3 m. m. 



Syn. Ichtiobdella stellata, Diesing i. 441. 



Platybdella mamiUata, Malm 218 



Piscicola respu'ans, Kessler 114. 



Piscium ectoparasita ad branchias (Gadus Lota, Lin.). — 

 The zoological museum of the university at Helsiugfors pos- 

 sesses specimens from Helsiugfors. — Kessler (op. cit.) has got 

 specimens from Kroustadt. 



Clepsine, Sav, Corpus depressum, dilatatimn, in globum involubile, 

 eonvexiuscidum. Gaput eontinu.um I subdiseretum. Oculi ij I. pilures, ut 

 plurimiim in tineas duas longitudinales dispositi. Acetabulum anale ven- 

 trale, centra affixum. Anus mediocris, rotundatus. Aperturce genitales 



