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AI^OA (3GAPEAK0A) DOIAOIA Dall. 



Soapharea ( Soapharea ) donaoia Dall, 1890, Trans. .Vagner 7ree Inst. 



3ci., P iladelphia, vol. 7^ , pt. 4. p. 649, pi. 33, fig. 15. 



Deserj-ption .- "Shell small, donaciforra, moderately pliamp, 

 with rather elevated orosocoelon.s be a>s at about the anterior third; 

 valves almost similarlj; sculptiired ; left valve with ahout twentj?- 

 fotir low, strap-like, narrow radial ribs id. th somewhat vTider inter- 

 spaces; the ribs are plain, anooth, and entire on both valves; on 

 the left valve the interspaces are crossed by numerous equidistant 

 elevated lines ~;hlch do not appear on the ribs; on the right valve 

 the interspaces are only marked by lines of grov/th; hinge-line short, 

 cardinal area very narrow, smooth; anterior end larger, rour.ded; 

 posterior end produced and attenuated; hinge teeth small, similar, 

 slightly divergent; internal margin of the valves v,'ith deep short 

 flutings. Ion. 6.8, alt. 4.5, diam. 5 ram." (Dall, 1398) 



T7/pe looalit;,; .- "Bowden, Jamaica. 



The umbones are relatively 'r-'-gh and conspicuous. On the umbo 

 of the right valve a verj- shallow and narrow sulcus is usually 

 present. Tov/ard the ventral narrin this sulcus broadens, but al- 

 though slie'htly emarp-inating the me^'ian ventral nargin; it is never 

 prominent; on the left valve the sulcus is absent or very poorly 



