268 WORMS. TESTACEA. 66. Oftrea. 
Inhabits the Mediterranean, i m innumerable varieties. 
Shell 3% inches long, 3j broad: fometimes whitifh, but moftly 
mixed with a fine pale bloom or yellowifh, and marked with 
traniverfe femilunar bands: xpper-valve more elegantly mark- 
ed. with 50-100 rays rough with acute imbricate fcales : mar- 
gin crenate: ears with tranfverfe ‘icaly ftriz, the larger one 
emarginate and fpinous: ' the f/f is eaten. 
Triradiata Shell nearly equiyalve, glabrous, immaculate, with very 
minute flriz. 
Mull. Dool. Dan. 2. tab. 60. sig. 1, 2. 
Found among Fuci in the feas of Norby. 
Shell red with fmall white fpots, within reddifh : upper-valve 
" with 3 rays: ovary of the fifh yellowifh. 
Fu, Shell nearly equivalye, ftriate, fpotted, rough, towards the 
margin. 
Mull. Zool. Dan. 2.tab.60. f. 3 
Inhabits North Seas, on the Bucks faccharinus, 
Shell rufous with whitifh or paler fpots, within red and quite 
' fmooth with pellucid fpots : rays of the upper- -valve obfolete ; 
_ ovary of the fifh rich red, 
Tigerinas Shell nearly equivalve, ftriate, glabrous, red with whitifh 
aid 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 
{pots ; upper-valve dotted: ovary of the fifh white. 
Septemradi- Shell neatly equivalve, ftriate, glabrous, with 7 convex rays. 
ata. — ' — Inhabits Northern Seat, 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 Zool. Dari. prodr. 2995. 
Senatoria.] Shell convex each fide with 22 rounded and tranfverfe 
wrinkled rays, the interflices with longitudinal granu- 
late ftriz 
Regenf. fick, V 1. tab. 3. fie. 36? 
Chemn. conch. 7, tab. 65. fig. 617. 
Inhabits the Dads Ocean; 2 inches 9 lines long, and about as 
müch broad; outíüde chefnut varied with violet and white, 
infide viole:, the citcumference bordercd with dull bay. 
Citrina 
