- 137 - 



Superfamily V 2 II :: ?. A 1 A . 



?arail3; ^^eneridae. 

 Subfainily Meretricinae . 

 Ceutvs TH.v^SEITELIA Dall. 



TRAIISEIIITELIA .U^aiOlIDLA n. r^ . 



gglloearrlia so, indet. Dall, 1905, Trans, ./aj-r"-' ■- "^i^ '^ t.-,.-^, 'Jci., 

 Philadelphia, vol. 3, ' . ', p. 1261 ( e:: pax'te). 



Desoriptl-- .- Shell srall, v;ell-ir "^" '-" \ slightl^ i.,.;.^ i- 

 lateral, roiinded sii'iDtrian'jular to h'roadly ovate; anterior and pos- 

 terior dorsal Ins t;:picallv subequal, posterior longer 

 and sli.flitli conve?^, '^"■-■-' anterior straight; urAones i:noderately 

 prosogTrate, subcentral in posit' ile long, poorl;: dc "■ . " ; 

 external surface sculp ttared with irro " ' lisposed concentric rng- 

 T.e , ^^sually weafe ' "'' often absent Ojj -■,;6t or all of the siirface hut 



;n present continuoiAS ac. " vie; hinge •.veil ■''eveloped, the 



middle left cardinal ohscm'el;" hifid or entire; ' nal tangential 



grooves pborl; '"'"'-■:''. 



Dir-i ens ions .- length, ,7,5 Liia. ; alt., 7 nm. ; semidiam., 2 imri. 



?.eniarhs .- The raenihers of this species displaj' a r^.e-r\' 

 of variahi] ■ ' ,; . '"V' -^^-ical foiTa, f roni 7i\ich the clLigi^oyi. 

 dravim, is rounded suhtri angular v/ith soihenual dorsal mar ' , mod- 



