ARCA. 229 



magellanica. 8. Shell transversely oblong, round- 

 ed at both ends, contracted in the middle, 

 and marked with decussated striae ; summits 

 approximated, and the margin entire. 



Area Magellanica. Chemnitz, vii. p. 192. t. 53. f. 539. 



Gmelin, p. 331 1. Bruguiere Enc. Meth. p. 100. 

 Area, No. 5. Schroeter Einl. iii. p. 281. 



Inhabits the Straights of Magellan. Chemnitz. 



Shell about ten or eleven lines long from the summit to the 

 opposite margin which is the shortest part, and the breadth 

 is about two and a half inches ; it has the hinge more nearly 

 central than in either of the foregoing species, but the ante- 

 rior is more produced than the posterior side ; it is coated 

 with a bright brown, somewhat bearded, epidermis, beneath 

 which the shell is white. 



barbata. 9. Shell transversely oblong, rounded at 

 both ends, and marked with decussated 

 striae ; summits approximated ; margin entire 

 and nearly closed. 



Area barbata. Linnazus Syst. Nat. p. 1 140. Born Mus. 



p. 89- Chemnitz, vii. p. 186. t. 54. f. 535. Schroeter 



Einl. iii. p. 262. Gmelin, p. 3306. Bruguiere Enc. 



Meth. p. 101. 

 Bonanni Rec. 2. f. 79- and Kirch, f. 78. Gualter, t. 91. 



f. F. Argenville, t. 22. f. M. Knorr, ii. t. 2. f. 7. 



Enc. Meth. t. 309. f. 1. 

 Inhabits the Mediterranean. Linnaus. Red Sea. Forskael. 

 Coasts of Spain, France, Italy and Barbary. Bruguiere. 

 Naples. Ulysses. 

 Shell about an inch and a half long, and rather more than two 

 inches and a half broad ; it is covered with a pale reddish 

 brown epidermis, which forms dark shaggy bristles on the 

 longitudinal stride, and the umbones are depressed ; with age 

 the length increases more on the anterior than on the pos- 

 terior side, and the hinge is consequently nearer to the cen- 

 ter in young, than in old shells. 



lacerata. 1.0. Shell transversely sub-ovate, de- 

 pressed, with longitudinal decussated striae, 

 alternately larger ; margins crenulated and 

 closed. 



