1G4 



Weymouth. This fpecies is furnidied with a large filky 

 hyjfus, not unlike that of the Pbvii, but of a coarfer tex- 

 ture, by which it adheres firmly to the bottom : and when 

 taken by dredging is ufually torn from the animal. We 

 have taken the Pea-crab, Cancer Pifum, and two minute 

 crabs. Cancer minutus, from one of thefe mufcles; the 

 former of an imufual fize. 



6. -^«^- 



Umbilicatus. Mytilus umbilicatus Br. Zool.t. ()b. i.16. 



Don. Br. Shells ii. t. 40. 

 Turt. Lin. iv. p. 292, 

 Mytilus curviroftratus. T)a Cojla. p. 220. 



M. with a thick, llrong, oblong, fub-oval fhell, in fhape 

 much like the two preceding; but is at once diftinguiflied 

 by a deep deprelTion, or umbilicus, under the beak, op- 

 pofite the hinge, which is fingularly intorted and wrinkled : 

 colour dark brown, or blackilh. Length rarely above 

 four inches. 



Mr. Pennant, who firft defcribed this fpecies ; fays it 

 is fometimes dredged up off Prie/lholme JJland, and that 

 it fometimes grows to the length of five inches. And adds, 

 that the pea-crab is found in this fiiell of a larger fize than 

 ufual. It is a very rare fhell, and feldom found but in the 

 place before mentioned. 



7. — <»— 



RuGOSUs, Mytilus rugofus, Lhu Syjl. -^.1156. — Gniel. Syjl.\i. 3352.1. 



Br. Zool t. 63. f. 12.— Turt. Lin. iv.p.290. 



Mytilus 



/ 



