114 



superne convexo, deinde recto et declivi; margine postico aequaliter superne convexo, deinde 

 decliyi, recto, attenuato, brevi truncato, in truncatura hiante; latere postico obtuse bian- 

 gulato; umbonibus tumidis, acutis, oppositis; cardine angusto, dente cardinali submargi- 

 nali, fossula angusta, profunda, sub cardine canaliculata, dentibua lateralibus magnis, com- 

 pressis, triangularibus, valde prominentibua ; sinu pallii minimo, trigono obtuso." (Deshayes). 



Mactra alta Deshayes in Proc. zool. Soc. 3854 p. 347. 



Trigonella alta Conrad Cat. Am. Journ. of üonch. III p. 35. 



Hab. Australia (^Ciiming-). 



130, Mactra catilliformis Conrad. 



Suboval, inaequilateral ; anterior aide sligbtly flattened or contracted ; posterior aide 

 with an oblique shallow groove or fold ; lines of growth coarse and prominent, lunule very 

 long, elliptical; ventral margin tumid posteriorly; cardinal pit oblique, large; pallial sinua 

 estending beyond the middle of the valve. — Long. 4^/5", alt. S^'/g". — 



Spisula catilliformis Conrad Amer. Journ. Conch. III 1867 p. 193 V. 1870 



t. 13 fig. 1. 



Hab. Panama. 



131. Mactra dolabriformis Conrad. 



Triangulär, equilateral, sligbtly ventricose, anterior side eomewhat produced, subcu- 

 neate, wunded at the end; ventral margin regularly wunded anteriorly and medially, um- 

 bonal slope with a slight carinated line and a distinct fold anterior to it ; post umbonal area 

 with an angular grove ; epidermis yellow olive, much wrinkled on the carinated line and 

 post umbonal slope; posterior end obliquely truncated, subemarginate ; pallial sinus extend 

 not to the middle of the valve, but opposite the posterior end of the fosset. — Long. — ? 

 Spisula dolabriformis Conrad Amer. J. C. III 1867 p. 193 V. 1870 t. 12 



fig. 1. 



Hab. Panama. 



Somewhat like Mactra exolete in Ibe outlines; but less elevated and not so 

 ventricose. 



132. Mactra Gabbi Tryon. 



Shell oval, nearly equilateral, thin, depressed, beaks narrow, not prominent, with a 

 slight ursed line radiating to the margin, smooth light corneous. 

 Long. 31, lat. 40 Mm. 



Mactra Gabbi Tryon Amer. J. C. V 1870 p. 170 t. 16 fig. 7. 

 Hab. Lower California. 



