WORMS. TESTACEA. 6o. Madara. 213 
Pelluida, Shell ovate thin pellucid white, with unequal tranfverfe 
fuia. | 
' Chemn. conc. 6. tab. 24. fig. 2345 
Inhabits Guinea: ) i inch long, and 2 broad: jhe// brittle, a 
little produced forwards and gaping. 
Fragilis, | She]l ovate thin fmooth pellucid flattifh, the anterior gape 
tranfverfely ftriate and wrinkled. 
Chemn conc. 6. tab, 24. fig. 235+ 
Inhabits Nicobar I/lauds ; refembles the laft, 
Sheil gaping and: flightly plaited on the fore-part; the margin 
acute, fubangular before and rounded behind. 
Rugofa. Shell ovate, dirty white, with elevated longitudinal ftriz 
crofling the tranfverfe ones which are a little more 
raifed. 
Inhabits Ezrofeam Ocean. Chemn conc. 6. tab. 24. fig. 236. 
Shell 2 3 inches long, 2 i broad; thick and white within. 
Jicoóarica" Shell ovate thin pellucid fmooth on the fore-part, the hind- 
part with cancellate ftriz. j 
Inhabits Nicobar I/lands, Chemn. conc. 6, tab, 24. fig. 237. 
Complanata Shell ovate thin with arched plaits, the plaits tranfverfely 
ftriate: lateral teetho. — : 
Inhabits India. Chema. conc. 6. tab. 24. fig. 238. 
Shell white or blueifh: an inch long, 2 2 broad. - 
* Listeri, ‘Shell very thin, nearly round, whitifh: hinge with a tri- 
pst angular tooth and large pyritorm hollow. 
Lifter Anim. Angl. tab. 4. fig. 23. 
Found atthe mouth of the river Tzes: 1 1 inch long and 2 broad. 
Piperita, Shell ovate compreffed tranfverfely ftriate: teeth of the 
hinge very minute, with a large oblique hollow. 
Adan’s Conch, tab. 17. fig. 18. 
Chemn. conc. 6. tab. 9. fig" 21, 
Petiv. Gazoph. tab. 9. fig. 3. 
Innabits the Mediterranean: 21 lines broad, 17 high, and 7 deep. 
61. DONAX. Animal a Tethys; shell bi- 
valve, with generally a crenulate margin, 
the frontal margin very obtufe: hinge 
with 2 teeth, and a finele marginal one 
placed a little behind, rarely double 
triple or 0. det 
Ocortum. 
