292 WORMS. TESTACEA. 68. Mytilus. 



Shell nearly triangular, flightly carinate near the beaks, covered 

 with a brownjfh fkin, under which it is rich violet, fometimel 

 yellowiih, fometimes ftriped with pale rays. 



•Incurve Shell very crooked on one fide near the beaks, then greatly 

 ruSt dilated; within with a violet tinge. ; 



On tne dnglefiea Coast. Brit. ZooL iv. tab. 64. fi Zi 74 

 SMI covered with a thick rough Ikin. 



• Fellucidus Shell oval tranfparent and very elegantly radiate length ways 



with purple and blue. - 



Pennant Brit. ZooL iv. tab. 63. fig. 75. 

 Found at Anglefea, in oyfter beds : 2 inches long. 



•UMic*- Shell contraded into a deep rugged cavity oppofite the hinge, 

 Arming a cjeep hollow when the valves are clofed 

 Pennant Br it. ZooL iv. tab. 63, fig. 75. 

 Donovan's Brit. Shells, ii. tab. 40. 

 F^und at Anglefiea ; nearly 5 inches long. 



Shell oval, refembling M. modiolus, but is aiftinguifhed by the 

 remarkable indentation, near the beaks. 



• Curtus. Shell fhort ventricofe obtufe at the beaks and dirty yellow 



Found at Weymouth. Brit. ZooL iv. tab. 64. fig. 76. A. 



Vngulatus, Shell fmooth flightly curved ; hind-margin infleded: hin^ 

 terminal 2-toothed. b 



Lister, tab. 360, 364: Gualt, test. tab. 91. E. 



Pegenf. conch. 1. tab. 4. fig. 47. 



Chemn conch. 8. tab. %\.f. 756; *l £ C 

 2. Chemn. conch. 8. tab. 84 . f. 74.-7. 



Inhabits the Mediterranean and Ca P e ofi good hope, 2) Nenv Zealand: 

 refemb es M cdulis, but is 5- inches long and z\ broad: {hell 

 green b.ueifli or black with a mixture of green, annulate; 

 beah difhnt pointed : hinge with teeth at the tip, the groove 

 with very numerous crenaturcs: valves very convex, refemb- 

 ling the hoof of an Ox, 



Bidens. Shell ftriate (lightly curved, the hind-margin inflecled : 

 hinge terminal 2-loothcd. 



Lister, tab. 356, 358, 366. 



Klein' ostr. tab. <),fig. 24. 



Knorr Vergn. 4 t. 30.fi. 3 and 6. t. 4. fi. 3, 



Chemn. conch. 8. /*£. 83. //>' 742, 741 



Inhabits the Mediterranean Mibiafic Atlantic and Magellanic Sms ; 

 hardly an ich long: fail Arhte longitudinally, covered with a 

 cinereous ftin, under which it is brown blue cr black. 



* Medio* 



