i 
292 WORMS, ‘TESTACEA. 68. Mytilus. 
Shell nearly triangular, flighty carinate near hi beaks, covered 
with a brownifh fkin, under which itis rich violet, fometimes 
yellowith, fometimes ftriped with pale rays. 
*Incurva- Shell very crooked on one fide near the beaks, then greatly 
tui. dilated: within with a violet tinge, — 
On the Anglefea Coast, Brit. Zool. iv. tab. 64. ie 74- 
Shell covered with a thick rough fkin. 
_ * Pellucidus Shell oval tranfparent and very elegantly radiate length ways 
= with purple and blue. 
Pennant Brit. Zool. iv. rab. 63. fig. 
Found at Angiefea, in oyfter fee i M long. 
*Umbilica- Shell contra&ed into a deep rugged cavity oppofite the hinge, 
(0 fut. "^ forming a deep hollow when the valves. are clofed, - 
Pennant Brit. Zool. iv. tab. 63. fig. 75. 
Donovan's Brit. Shells. M. tab. 40. 
Found at Zglzfea ; nearly 5 inches long. 
Shell oval, refembling M. modiolus, but is diftinguifhed by the 
remarkable indentation near the beaks, 
* Curtii, Shell fhort ventricofe obtufe at the beaks and dirty JEU, 
Found at Weymouth. Brit. Zool. iv. tab. 64. fig. 76. A 
Ungulatute Shell fmooth flightly curved; hind-margin inflected: hinge 
terminal 2-toothed. 
Lister. tab, 360, 364: Gualt, test. tab. gt. E. 
Regenf. conch, 1. tab. 4. fig. 47. 
Chemn coneh. 8. tab. 84. f. 756. 
z. Chemn. conch. 8. tab. 84. f. 747. 
Inhabits the Mediterranean and Cafe of good hope, 2) New Zealand: 
refembles M. edulis, but is 5 inches long and 21 broad: fhell 
green blueifh or black with a mixture of green, annulate ; 
beaks diftant painted : Ainge with 6 teeth at the tip, the groove 
with very numerous crenatures: valves very convex, refemb- 
ling the hoof of an Ox, 
Bidens. Shell ftriate flightly curved, the hind-margin inflected : 
inia hinge terminal 2- toothed. | - 
Lister. tab. 356, 358, 366. 
Klein ostr. tab. 9. fig. 24. 
Kzarr Vergn. 4. t. 30. f. 3 and 6, £t. 4. f. 3. 
Chemn. conch. 8. tab. $3. he 7425 743. 
Inhabits the Meaiterranean AEtPtopic Atlantic and. Magellanic Seas ; 
‘hardly an ich long: /Ze// triate longitudinally; covered with a 
cinereous fkin, under which it is brown blue or black. 
| *Modio- 
E ee ee eee 
