p 890. 1 
Tesla orbiculato-rhombea, | subinequilatera, po- 
stice latior subtruncata, antice magis rotundata, te- 
nuis, pellucida, subtiliter striata, compressa, margini- 
bus (teste clause) scutis. — Nates minute, acutiuscu- 
le, nmbonibus subdepressis. 
Habitat in fossis & amnibus, passim. In amne 
Hüjcà ad Lund, haud raro. 
j 
5. Cyclas calyculata. 
C. ferta orbiculato-rhombea, compressa, tenui, 
diaphana, iemwiftr ríriaía, zona marginali iutercen- 
ie; matibus  protuberantibur, acuíztrculir. 
Diam. transv. 6 — io millim. 
Cyclas calyculata, Draparn. Hist. des Moll. p. :3o. t. 
10. f. 14, 15. — Lamarck Hist. des anim. s. vert. 
V. p. 55g. — Pfeiffer Land- u. Wasserschn. p. 
18. 
PaL 5. £ i197 
Testa orbiculato-rhombea, tenuissima, fragilis, 
subtiliter striata, nitida, diaphana, compressiuscula, 
marginibus aeutis, pallide cinerea vel corulescens, zo- 
na marginali lutescente,  Nates valde prominentes, 
tuberculese, umbonibus | tumidis. 
Habitat im fossis & — paludibus, passim. 
** Tvsta inequilatera, transversum subovatas siphone 
simplici, brcvi, cylindraceo.  (Prsinrvw, Pfeiff. ). 
4. Cyclas obliqua. 
| C. tera ovata, oblique irigona, venfritora, 
iramsverrim sulcato-ririafa;  wmbonibus  obturir. 
Diam. transv. 9 — rr. millim. - 
Cy- 
