limopsis. 543 



Sub-gen. pectunculus, Lamarck, not Adanson. 



Valves with prominent, radiating, longitudinal ribs, either 

 with or without transverse striae. 



sequilatera, Gmel. pectinata, Gmei. 



assimilis, Sow. pectinoides, Desk. 



aurifl.ua, Reeve. pertusa, Reeve. 



bicolor, Reeve. rosea, Reeve. 



Delessertii, Reeve. sericata, Reeve. 



insequalis, Soiv. spurca, Reeve. 



. laticostata, Quoy and Gaim. striatulata, Sow. 



morum, Reeve. strigillata, Sow. 



multicostata, Reeve. tenuicostata, Ret 



nodosa, Reeve. tessellata, Sow. 



oculata, Reeve. variegata, Chem. 



pallium, Reeve. vitrea, Lam. 

 parcipicta, Reeve. 



Genus limopsis, Sassi. 



Shell orbicular, convex, slightly oblique. Hinge with 

 the teeth divided into two equal, curved series of trans- 

 verse plates; ligamental area with a triangular cartilage- 

 pit in the centre. Muscular impressions distinct ; pallia! 

 line simple. 



Syn. Pectunculina, D'Orb. Trigonoccelia, Nyst. 



Ex. L. multistriata, ForsMl, pi. 126, fig. 2, 2, a. 



The hinge-plate in this genus has a distinct triangular 

 cartilage-pit. There are four recent species known ; L. 

 multistriata is from the Eed Sea; L. Belcheri, Adams 

 and Reeve, was dredged off the Cape of Good Hope from 

 a depth of one hundred and twenty fathoms; L. can- 

 cellata is not uncommon at Singapore; and L. boreal is 

 is from Norway. 



