TPlIBE NYMPHACr.A. 81 



D Btcolor. Lam. 13. — Aji, D. Bicolor, Gme1.no. \C> . '. 

 — Gnalt. t. 88./. .^) —Lif^t. t. 392. /. 23 J . Ovate, wedge-shaped, 

 whitish stained with brown, with a few longitudinal strite, decus- 

 sating still fewer transverse ones : anterior end with waved and curled 

 furrows : spotted with violet within. — Maurli'mn or India. 



D. ViTTATA. Lam. 14. — Del.t. %.f. 12. — D. Biradiata a«fZ 

 Skxradiata. W. S. Ovate, rather depressed, with transverse 

 groove-like striae ; whitish with a very few rufous rays, which en- 

 large as they approach the margins. — Mediterranea7i." 



D. Lessoni. Desk. E. '3. p. 99. no. 1.5. Triangular, smooth, 

 depressed, sub-equilateral, pale fulvous with numerous brown in- 

 terrupted rays, and the apex acute : within brownish white, and the 

 margin quite entire and gaping at one end : one of the lateral teeth 

 very long, the other indistinct. — Chili. — Tolerably lar(je, and the 

 lenf/th and breadtli nearli) equal. 



i). CoRBULOiDES. I)e>ih. E. 3. p. 99. no. 18. Triangular, 

 gibbous, equilateral, polished and heart-shaped : pink with elegant 

 waved or angulated reddish yellow transverse lines ; brownish red 

 within. 



D. EauiLATERA. Som. Tanh. Cat. — D. Veneroidea. Gray. 

 — Venus Donacina. Cli. f. 1983, 4. Sub-triangular, sub- 

 equilateral, the slopes nearly straight, ventral edge arcuated and 

 ascending towards the anterior and longer extremity ; strong, con- 

 vex, white covered with angular sub-reticulated markings of ochra- 

 oeous brown and obsoletely rayed : disc smooth, sides with distant 

 concentric grooves : anterior slope rounded, towards the beaks 

 edged with radiating sub-granulated striae, elsewhere smooth : inside 

 white, margin entire, three approximate cardinal teeth in one valve, 

 two and a rudimentary in the other ; no lateral. I .. 1-i-. — S. Seas. 



D. OwENii. Gray in B. M. Exti'emely elongated, 

 smooth, polished ; anterior side obliquely truncated and very 

 short, its slope concentrically striated, and its dorsal edge 

 much sloping ; broad white rays on a drab ground, a short narrow 



pressed and perfectly smooth ; anterioi-ly very short, very convex, 

 with very fine radiating strife, which are very indistinct, except on 

 the slope ; umbonal ridge angulated near the smooth beaks ; ven- 

 tral edge arcuated : inside stained with purple : receptacle of the 

 lateral tooth very prominent. 1^..2. 



- D. TRiauETRA. Lam.\5. Triangular, sub-equilateral, glossy, 

 much swollen under the beaks, whitish with fine transverse striae, 

 and a few vestiges of rays : and indistinct violet spot within, i. — 

 New Holland. -(A young variety of Cytherea Corbicula. 

 Desk) 



G 



