S48" AXEL A. OLSSON 



B. Shell subelliptical to subrectangular in shape, the basal margin usually 

 more or less rounded. Surface color white, sometimes rayed, mottled 

 or speckled with violet and brown; sometimes wholly white or pink. 



3. Valves elliptical in shape, equilateral, or with the posterior side some- 

 what longer. Color uniformly white, pink or rose-red; sometimes white 

 with the umbones deep rose-red. Periostracum thin and inconspicuous. 

 Pallial sinus is high and with an angled outline under the beak. 



Genus Sanguinolaria 



4. Valves irregularly rectangular in shape, the two ends widely rounded 

 or subtruncated. Surface plainly marked or with a rayed, mottled, or 

 speckled pattern. Periostracum usually coarse, brown, or black in color. 



Genus Gari 



G€nus SANGUDfOLABIA Lamarck, 1799 

 Type species by monotypy, S. sanguinolenta (Gmelin) [=S. cruenta 

 (Solander)]. 



Shell large, of medium convexity, thin, rose-red, or white. Hinge with 

 two cardinal teeth in each valve; there are no laterals. Ligament external, 

 posterior in position, the resilium attached to the upper surface of a long 

 narrow nymph. The pallial sinus is deep and ample, angular above, and 

 widely confluent with the pallial line below. The adductor scars are distinct, 

 placed high in the valve. 



Two subgenera. 



I. Valves of equal convexity and similar form, the posterior end not 

 strongly flexed. Pallial sinus equal in the two valves. 



Subgenus Sanguinolaria, s.s. 



II. Valves of unequal convexity, the left valve flattened. Posterior end of 

 right valve flexed. Pallial sinus more or less discrepant in the two 

 valves. 



Subgenus Psammotella 



San^Inolaria (San^Inolaria) telllnoides A. Adams Plate 77, figures 10, 11 



Sanguinolaria tellinoides A. Adams, 1850, Proc. Zool. Soc. London, p. 170, pi. 6, fig. 



6. — Reeve, 1857, Conch Icon., vol. 10, Sanguinolaria, pi. 1, fig. 3. — Hertlein 



and Strong, 1950, Zoologica, vol. 35, pt. 4, p. 219. 

 Tellina miniata Gould, 1851, Proc. Boston Soc. Nat. Hist, vol. 4, p. 90 San Juan, 



Lower California. — Gould, 1853, Boston Jour. Nat. Hist., vol. 6, p. 397, pi. 



16, fig. 1. 



Shell large (length to nearly 90 mm.), irregularly subelliptical, the 

 anterior side shorter, higher, well rounded, the posterior side longer, nar- 

 rowed, slightly impressed along a zone extending from the beak to the 

 ventral margin. Surface smooth or marked with fine, concentric growth lines 

 and colored a dehcate rose-pink, generally in light and dark bands. Both 

 valves are of equal convexity. Pallial sinus deep, angular above and fully 

 confluent with the pallial line below. 



Length 75 mm., height 44 mm., diameter 22 mm. Cojimenes, Ecuador. 



Range — Gulf of California to Ecuador. Panama: Burica Peninsula. 



Colombia: Buenaventura; Isla del Gallo; Gorgona Island. Ecuador: 



Cojimenes. 



Sanguinolaria (Sanguinolaria) respertina Pilsbry and Lowe Plate 85, figure 5 



Sanguinolaria vespertina Pilsbry and Lowe, 1932, Proc. Acad. Nat. Sci. Philadelphia, 

 vol. 84, p. 90, pi. 12, figs. 3, 4 (on explanation of plate as Semele vespertina). 

 — Hertlein and Strong, 1950, Zoologica, vol. 35, pt. 4, p. 220. 



