_ /l 7.? - 



Subfamily C- e ra m i n a e ,, 

 Genus PAHilS TAHTE 3 on rad . 



PAHA3TAHTS A TIL^^ZT^IS n. 



Oesarj-pti', n «- Shell s'^icll, narrov , ' "i, trip-onal, well- 

 inflated^ siibeoudlateral, -• - - oriorly; snb- 

 truiiCate^ anteriorly- '-eriorl;: , • arc^iate; uribo ver;- 

 liig'li, tumid, sliglitl; ;;rai;e ; ;:. -1 £iii:fa?e scnlptia-e' 

 vd. th increment als and o-oseui'e concentric r' ' , more prominent 

 ventrallj', and a few faint radial lineo on the dorsal half of the 

 shell; lef-u valve v/ith two strc " ' 'It? "bifid cardinals, sepa- 

 rated "by a relatively hroad and. deep soc':et; inner margin of the 

 V si ve f i ne 1 y c r en ul a t e ri . 



Dii.iensions. - Lat., C.5 : ui. ; sit., ". ,.; semiuiam., l.r, ; 



P>em.:rl:s .- The oce ^e of a ciii.?-le valve of a Parastarte 



in the -^owden fauna is surprisi ' :ie has heiv^r heen 



reported from areas outside of the 'Iz ' ■egion, vhere it 



is represented by it ,2* triquetra Oom-?/^ (l) V7hich ra;ir;es 



(1). Proc. Aoad. i:at. Sci., Philadelphia, vol. 3, p. "4, pi. 1, fif 

 5, 1845 (as Astarte friq^-ietra ) ; Proc. Acad. ITat. Sci., ?hi''a- 

 del-ohia, for 18 5.^, p. 2^3, 13 2; ^^all , "^.ull. TJ. 3. Hat. I.: ■ ., 

 no. ^7, p. 48, -ol. 49, fi ^-c. 6-3, 1389. 



from •'■Itp' "'■ ''1'? ene to the '^eecnt. The ""o'"-"''^!'! "'-"■'•n is vei-y close 

 indeed to triquetra . being slightly more ij.ilatcd, ■ ith itiore 



