4 
CHARACTERES GENERUM, 
CYPRIA, 
TESTA univalvis, involuta, fubovata, obtufa, laevis. 
Apertura utrinque effufa, linearis, utrinque dentata, longitu¬ 
dinalis. 
CONUS, 
TESTA univalvis, convoluta, turbinata; 
Apertura effufa, longitudinalis, linearis, edentula, bafi integra* 
Columella laevis. 
Fig. 21. 22. 24. 
NAUTILUS. 
TESTA univalvis, fpiralis, involuta, itlhmis perforatis conca¬ 
merata, polythalamia. 
ARGONAUTA, 
1 • .1 , , 
TESTA univalvis, fpiralis, involuta, membranacea, unilocularis. 
PINNA. 
TESTA fubbivalvis, fragilis, erecta, emittens barbam Byffmam, 
Cardo edentulus, coalitis in unam valvulis. 
MYTILUS, 
