242 



POPULAR CONCHOLOGY. 



branchiae of each side united into one ; labial tentacles 

 triangular.* — 10 species; also fossil. 



These Mollusca live in the sand at considerable depths, 

 and are found principally in the seas of Europe. P. striata, 

 a very pretty species, and P. obtusa are found on the 

 English Southern shores. Some species come from the 

 Persian Gulf and Pacific Ocean. The shells are all small 

 and pearly within. 



Anatinella. Sow. — Shell ovate, nearly equal, one 

 end rounded, the other truncated 

 or beaked; ligament internal, in- — - \Ju^^ .. 

 serted between two spoon-shaped J ji 

 processes, one in each valve, and 

 on one side of each are two car- 

 dinal teeth ; no pallial sinus. Ani- 

 mal unknown. - — 1 species. 



This shell is thin, fragile, and 

 rather pearly inside. The species A. Sibbaldii is found on 

 the sands of Ceylon ; it is very like Anatina, but has no 

 testaceous appendage. 



Cochlodesma. Couthony. — (Ligula Becluz.) Shell 

 thin, inequivalve; muscular impressions connected by a 

 deeply sinuated pallial impression; 

 hinge with a spoon-shaped process 

 in each valve for the cartilage ; ex- 

 ternal ligament slight, no shelly ap- 

 pendage; beaks fissured, f Animal, 

 compressed ; mantle closed, except 

 anteriorly for the broad compressed 

 foot; siphons long, slender, divided 

 in their whole extent. — Few spe- 

 cies ; also fossil. 



Anatinella Sihho.hUi. 



Forbes's British Moll. 



t Sow., Conch. Manual 



