19 



Family IV.— AVICULID/C, Swainson. 

 Genus I. — Avicula, A7(?/«. 

 AvicuLA HiRUNDO, Linn. 



Genus II.— Pinna, Lister, 



Pinna rudis, L. 



Family V.— MYTILID/E, T^/m. 



Genus I. — Mytilus, Linn. 

 Mytilus edulis, L. 



Mytilus edulis, v ungulata, Z. 



Mytilus edulis, v incurva, Penn. 



Mytilus edulis, v galloprovincialis, Lam. 



Mytilus edulis, v pellucida, Penn. 



Mytilus edulis, v pallida, Mar. 

 Mytilus modiolus, Linn. 



Mytilus modiolus, v ovata, Jeff. 



Mytilus modiolus, v umbilicata, Penn. 



Mytilus modiolus, v cylindrica, Mar. 

 Mytilus barbatus, Z. 



Mytilus barbatus, v oblonga, Jeff. 



Mytilus barbatus, v depressa, Mar. 

 Mytilus Adriaticus, Lam. 



Mytilus Adriaticus, v ovalis, Soiv. 

 Mytilus phaseolinus, Phil. 



Genus II.— Modiolaria, Beck. 

 Modiolaria marmorata, Forbes. 

 Modiolaria costulata, Risso. 

 Modiolaria discors, Linn. 



Modiolaria discors, v angustior, Jeff. 



Modiolaria discors, v semilsevis, Jeff. 

 Modiolaria nigra, Gray. 



Genus III.— Crenella, Broivn. 

 Crenella rhombea, Berk. 

 Crenella decussata, Mont. 



