- Ij; - 



Superfaraily Pectinacea. 



Family Pectinidae. 

 Genus PEG TSN Kttll e r . 

 S^^■bgemlS Peeten s. s. 



Section Peeten s. s. 



PS^TEIT fP2GTElO BAI^IiETTI n. sp. 



Peeten ( Peoten ) soror :}all, 1898, Trans. Wagner Free Inst. 3ci., 



Philadelphia, vol. 5, pt. 4, p. 712 (ex "oarte, non Gabb, 

 1875). 



Description .- '^hell large, sizbequilateral ; doreal margins 

 long, slightly ooncffYe, diverging at an angle of about 95°; right 

 valve decidedly convex, sculptured with nineteen to tv/enty-two 

 strong, high, almost square, radial ribs, their e'lges and tops be- 

 ing sli-htly rounded, separated by narrower, deeply chfinnelled 

 interspaces; in the interspaces and on the flanks of the ribs ob- 

 scure, fine slightly raise-"; concentric lines r^resent; left valve 

 slightly concave, v/ith the same number of narrower, strong, square 

 radial ribs, v/ith dr^ep, flat interspaces of the sarae mdth or slip-ht- 

 ly v:i''ler; concentric lines mire irominent thfsn on the right valve 

 and oc^easionally extending ocross the ribs, but less conspicuous 

 on the ribs than in the intersoaces; submargins without radial 



