PLICATULA. 



5G1 





microlepos, Lam. 

 multimuricatus, Reeve. 

 rnultisetosus, Reeve. 

 mus, Reeve. 

 Nicobaricus, Chem. 

 nudus, Chem. 

 nux, Reeve. 

 ocellatus, Reeve. 

 Pacificus, Reeve. 

 pictorum, Chem. 

 plurispinosus, Reeve. 

 princeps, Broil. 

 raclula, Reeve. 

 ramosus, Reeve. 

 regius, Gmel. 



rubicundus, Reeve. 

 setiger, Reeve. 

 Sinensis, Sow. 

 spectrum, Reeve. 

 tenebrosus, Reeve. 

 teuellus, Reeve. 

 tenuispinosus, Sow. 

 unicolor, Soiv. 

 ustulatus, Reeve. 

 varians, Soiv. 

 variegatus, Chem. 

 vexillum, Reeve. 

 violaceus, Reeve. 

 virgineus, Reeve. 

 zonalis, Cheiiu. 



Genus PLICATULA, Lamarck. 



Shell inequivalve, plicate, irregular, attached by the beak 

 of the right valve ; beaks unequal, not eared ; hinge-area 

 indistiuct. Hinge with two strong, diverging, cross-grained 

 cardinal teeth in each valve, with an intermediate pit for 

 the internal cartilage. Muscular impression simple; pallia! 

 line entire. 



Ex. P. plicata, Forskal, pi. 128, fig. 4, 4, a. 



The fossil representatives of this genus, of which there 

 are upwards of forty species from the Trias of Europe, the 

 United States, Algeria, and India, have had the name of 

 Harpax bestowed on them by Parkinson. The recent 

 species, about nine in number, are chiefly from the Phi- 

 lippines, Australia, and Western America. 



