) 99 ( 



Testa orbiciilato-rhombea, subinxquilatera, po- 

 stice latior s.ubtruncata ; antice magis rotundata, tc- 

 imis, pelljacida, subtiliter striata, compressa, margini- 

 bUs (testaj clausae) acutis. Nates minutae, acutiuscu- 

 lae, nmbonibus subdepressis. 



Habitat in fossis & amnibus, passim. In anine 

 Hojcfi ad Lund, haud raro. 



5. Cyclas calyculata. 



C. testa orbhulato-rhombea, compressa, tenui, 

 diaphanct, tenuiter striata, zona marginali hitescen- 

 te ; natibus protuberautihus, acutiusculis. 



Diam. transv. 6 — 10 millini. 



Cyclas calyculata, Draparn. Ilist. des Moll. p. i3o. t. 



10. f. 14, i5. — Lamarck Hist. des anim. s. vert. 



V. p. 55c). — PfeiiFer Land- u. Wasserschn. p. 



122. t. 5. f. 17, 18. 

 Tcsta orbiculato-rliombea, tenuissima, fragilis, 

 subtiliter striata, nitida, diaphana, compressiuscula, 

 niarginibus acutis, pallide cinerea vel cocrulescens, zo- 

 na marginali lutescente. Nates valde prominentes, 

 tuberculosae, umbonibus tumidis. 



Habitat id fossis & paludibus, passim. 



** Tcsta inccquilatera, transversim subovata; siphone 

 simplici, brcvi, cylindraceo. (Pisidium, PfeilT. ). 



4. Cyclas obliqua. 



C tssta ovata, oblique trigona, ventricosa, 

 transversiru sulcato-striat-a ; umbonibus obtusis. 



Diain. transv. 9 — H millim. 



Cy~ 





