268 WORMS. TESTACEA. 66. Oftrea. 



Inhabits the Mediterranean^ m innumerable varieties. 



Shell 3| inches long, $\ broad: fome times whitifh, but moftly 

 mixed with a fine pate bloom or yellowifh, and marked with 

 traniverfe fem : lunar bands: upper-<yal-ve more elegantly mark- - 

 ed. with 50-100 rays rough with acute imbricate fcales : mar- 

 gin crenate: ears with tranfverfc fcaly ftriae, the larger ope 

 emarginate and fpinous : xb&jijk is eaten. 



friradiata Shell nearly equivalve, glabrous, immaculate, with very* 



minute ftrice. 

 Mull. Dool. Dan, 2. tab. 60. jig, j, 2. 

 Found among Fuci in the feas of Norway, 

 Shell red with fmall white fpots, within reddifh : upper-valve 



with 3 rays : ovary of the fifh yellowifh. 



Fuci. Shell nearly equivalve, ftriate, fpotted, rough, towards the * 



margin. 



Mull. Zool. Dan. 2. tab. 60./. 3—5. 



Inhabits North Seas, on the Fucus faccharinus. 



Shell rufous with whitifh or paler fpots, within red and quite 



fmooth with pellucid fpots; rays of the upper-yalvc obfolete : 



ovary of the fifh rich red. 



Ttgerinai Shell nearly equivalve, ftriate, glabrous, red with whitifli 

 fpots. 



Mull. Zool Dan. 2. tab. 6. fig. 6—8. 



Inhabits the North Seas-, on Fuci : lower-valve more deeply 

 grooved, and varied with large undulate cofluent pale yellow 

 fpots ; upper-valve dotted : ovary of the fifh white. 



Septemradi- Shell nearly equivalve, ftriate, glabrous, with 7 convex ray?. 

 ata. Inhabits Northern Seas* Mull. Zool. Dan, prodr, 2992. 



Arata. Shell nearly equivalve, within and without grooved and 

 red ; one part rough, the other glabrous. 

 Inhabits North Seas. Mull 3 Zool. Dan.prodr. 2995. 



Senatorial ^lell convex each fide with 22 rounded and tranfverfe 

 wrinkled rays, tfie interftices with longitudinal granu- 

 late ftrix. 



Kegenf. conch. I. tab. 3. fig, 36 ? 



Chemn. conch. 7. tab. 65, fig. 617. 



Inhabits the Indian Ocean ; 2 inches 9 lines long, and about as 

 much broad j outfide chefnut varied with violet and white, 

 Lnfide violet, the circumference bordered with dull bay. 



Citrina 



