- 5C1 - 



"•This is a small S"OfOirs, attachr". 'by ^"^ -^ left vrlve, — Ith 

 the scalpti^re of velves d isc;re-.x- r,t. I'he attached ve.l" 

 ver:':iiciTl-ately verrucose surface with a few distaiit " low, 



radial spines, sotnetines oosolete; the free valve has lov;, flute :\ 

 GO na en trio lamellae." (Dall, 19C:~). 



Shell SEE 11, thin to moderately heavy, outline variable, 

 u;:ually suborbioiilar or elongate -siibovate ; left vrlve ^bed, 



irrc-ular, deeidedlj convex, with prominent, S'crong.'l; te um- 



bones; external sttrface soiilpture'^ vjith relatively coarse, slight- 

 ly i::ibri(3atine' on -centric Isr.iellae, at intervals -orndroed and ele- 

 vated into sl'ort scales arranged in more or less obscure radial 

 series; irregular, interrupted, sv/ollen radial lines also present; 

 right v-"^^."e conpresse'"' ^^t •'i-.^-T'p'^f^Ty ^-r.-^ir-^r-^ 1- t'" e -.'l re- 



gion; sculptured with usually closely-set, orojecting, crenulate^' 

 lamellae; inner margin of right valve with fine, short r ions; 



on the left velve the ro"" o-^ R-f:--i c,f:i i p np.'^fiT ;;- remove'^ from the 

 raarc-in, except on t e upoer posterior mar~in, and faint radial 

 lines sometimes visible on the interior surface. 



Dimensions. - A left vslve : la'f^., 1*^ "T'i. ; r.lt., 14 ram.; 

 diam. , 5.'^- mm. A right vslve; lat., 11 . 7 mm.; s.lt., 12.5 . m. ; 

 diam. , 4.8 mm. 



Re'sr^'S,- Amonrr ^-"'''^ ^- ■ n-^-,--" v-i ir,-->r; o-p ■f:'!-i t =; prn^-^'-r: there are 

 many that are la.r'~er than the t^. pi sculptu^ t were 



