2i8 WORMS. TESTACEA. 62. Venus. 



Murr.fund. test. tab. 2. fig. 1 1, 16. 17. 



Knorr, Vergn. I. /«£. 4.. fig. 3, 4, 



J6wrr <&/«-. ««/. /<?/. /*£. B./Tg-. 9. 



£0/7/ Af«/". O.T. Vind. ted. p. 57. vign.fig, a, 



Chemn. conch, 6. ta£, 2j.fig. 271 — 273. 



Schrcct. Litter at. I -fg. I, 2. 



Inhabits the American Ocean, and is extremely rare and valuable. 



Shell eqm valve, Come what heart-fhaped, rounded, pale, pink, a 

 little gibbous before and behind, and marked with tranfverfe 

 parallel fharpened ribs; within frnooth white and arched or 

 vaulted under the knobs: binge of the left valve 3-toothed, the 

 teeth approximate and diftinft from the focket, the middle one 

 comprefled and fmaller, the lateral ones divergent thickifh and 

 obtufe ; the oth«r valve with 2 approximate comprefTed teeth 

 between 2 hollows : margin or rim very obtufe and entire: 

 beaks recurved rather obtufe and glabrous at the tip, with an 

 ovate flefh-colour deprefTion behind them: the flattened fide 

 fle/h-colour with a pale border and yellowifli ftripe reaching 

 half way from the beaks, obliquely ftriate, and furnifhed with 

 a row of fpines each fide originating from every fecond or 

 third rib of the (hell, tne fpines incurved growing gradually 

 longer and grooved beneath; within thefc and near the beaks 

 is another row of 5 fmaller fpines each fide. 



Papbya. Shell fomewhat heart-fhaped with thickened wrinkles; the 

 flattened fide with attenuated wrinkles, and complica- 

 ted lips. 



Lifter Conch, tab. 279. Regenf. conch, i.tab. f.fig* }U 



Bonann. recr. 2. fig. 75. Muf. kirch. 2. fig. 72. 



Kumpf. Muf. tab. 48.//^. 5. Gualt. teji. tab. 85. A ■. 



Spengl. comb. tab. \*fig. I. Argennj. conch, tab. 21. B. 



Knorr, Vergn. 2. tab. 28. fig. 2. 6. /. 5./. 6, /. 6./. 2, 



Chemn. concb. 6- tab. 2j.fig. 274 — 276. 



2. Chemn. concb. 6. tab'. 2J.fig. 277. 



3. Knorr Vergn. 6. tab. $.fig. 6. 



.Inhabits American IJlands : 2 inches long, 1 \ broad. 

 Shell white with brown fpots ftriae and waves, the anterior part 

 with. angular brownifh lines: the tranfverfe ribs are broad 

 and convex : behind the beaks a brown depreffion. 



MSrtca, Shell fomewhat heart-fhaped, with decuflate ftrix : the 

 flattened margin lamellous. 

 Lister conch, tab. 497. Argenv. Zoom. tab. 12. C. 

 Chemn. cone. 6. tab. 27. fig. 282 — 286. 

 Inhabits the American Ocean : very rare. 



Shell white with reddifh-brown fpots rays and veins ; the margin 

 crenulate. 



Dyfera. 



