Transactions - American Philosophical Society . symijluinota I in ?/?ssu/uc 7)rjunJC£iu/fh\JMraytfli OF THE FAMILY OF KAIADES. 445 be double in the right; lateral tooth lamelliform and doublein the left valve only, the two teeth form one continuouscurve line, somewhat abrupt at both terminations, more soat the anterior one; anterior cicatrices distinct; posterior cica-trices confluent; dorsal cicatrices very perceptible. Cavityof the beaks wide and very shallow; nacre purple and irides-cent. Hemarks.—This beautiful shell most resembles the Sym-phynota alata in its general form, but its posteri
Transactions - American Philosophical Society . symijluinota I in ?/?ssu/uc 7)rjunJC£iu/fh\JMraytfli OF THE FAMILY OF KAIADES. 445 be double in the right; lateral tooth lamelliform and doublein the left valve only, the two teeth form one continuouscurve line, somewhat abrupt at both terminations, more soat the anterior one; anterior cicatrices distinct; posterior cica-trices confluent; dorsal cicatrices very perceptible. Cavityof the beaks wide and very shallow; nacre purple and irides-cent. Hemarks.—This beautiful shell most resembles the Sym-phynota alata in its general form, but its posterior wing is lesselevated. The colour of its nacre is the same. It differsentirely, however, in the cardinal tooth, and in possessing theanterior connate wing. A metallic sound is produced bydropping one valve into the other, which is very remarka-ble, and is caused by the density of the calcareous matter ofthe nacre, which is very thin. The epidermis is exceedinglysmooth and glossy. 2. SVMPHYNOTA Bl-ALATA. Plate XIV. fig. 24. Testa ovato
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