402 AXEL A. OLSSON 



the growth lines fine and indistinct. There is a small lunule and a narrow 

 escutcheon. Hinge weak; there is a strong anterior lateral in the right valve 

 adjacent to the cardinal. Pallial sinus large and deep, highest and rounded 

 under the beak and almost reaching to the anterior adductor scar, its lower 

 limb united with the pallial line below for about half its length. 



Length 20 mm., height 14.6 mm., semidiameter 4.3 mm., a left valve, 

 Manta, Ecuador. 



Length 17.4 mm., height 12.5 mm., semidiameter 3.2 mm., a right valve, 

 Galeras Peninsula, Ecuador. 



Specimens from Ecuador seem identical in size and shape to typical 

 M. meropsis from California. M. faziana is probably a small form of the 

 same species. 



Range — Southern California to Ecuador. Panama: Bucaro. Ecuador: 

 Esmeraldas; Galeras; Manta; Santa Elena. 



Moerella (3Ioerella) snffnsa (Dall) Plate G9, figures 10, 10a 



Tellina {Angulus) suffusa Dall, 1900, Proc. U. S. Nat. Museum, vol. 23, No. 1210, pp. 



303, 319, pi. 3, fig. 10 "San Ignacio Lagoon, Lower Cal." 

 Tellina {Moerella) suffusa Dall, Hertlein and Strong, 19+9, Zoologica, vol. 34, pt. 2, 



p. 72. 



Shell cuneate, very thin, convex, blunt in front, pointed behind, the 

 posterior end slightly longer, pinkish, yellowish, or translucent white in 

 color; surface rather strongly, closely, and irregularly concentrically striate, 

 with an unusually large and wide, lunular impression, but no escutcheon 

 to speak of; hinge normal, delicate; interior polished; the pallial sinus high, 

 well separated from the anterior adductor, though there seems to be no 

 trace of a ray in the specimens examined. (Dall, 1900.) 



Length 13.5 mm., height 9.2 mm., diameter 4.7 mm. 



This species is characterized by its broadly trigonal form, by its 

 nearly medium beaks, large lunule and short, bluntly pointed anterior end. 

 Color white, yellow or pink, often with a red streak on each side of the 

 umbone. Some specimens show a strong play of rainbow colors over the 

 surface. 



Range — Lower California to southwestern Colombia. Mexico: Lower 

 California. Nicaragua: Corinto (Hertlein and Strong). Colombia: Isla del 

 Gallo. 



Moerella (Moerella) erytlironotus (Pilsbry and Lowe) Plate 68, figure 4; 



Plate 69, figures 2, 2a 



Tellina puella C. B. Adams, 1852, Ann. Lyceum Nat. Hist. New York, vol. S, pp. 507, 

 546, No. 468. (Not puella Hanley, 1846). Panama. 



Tellina puellula Salisbury, 1934, Proc. Malacol. Soc. London, vol. 21, pt. 2, p. 86. (New 

 name for T. puella C. B. Adams). 



Tellina {Angulus) erythronotus Pilsbry and Lowe, 1932, Proc. Acad. Nat. Sci. Philadel- 

 phia, vol. 84, p. 94, pi. 12, fig. 7. 



Tellina (Moerella) erythronotus Pilsbry and Lowe, Hertlein and Strong, 1949, Zoologica, 

 vol. 34, pt. 2, pp. 69, 70. 



Shell small or of medium size (length to about 25 mm.), elongate, 

 solid, the anterior side a trifle longer, full and of medium convexity along 

 the umbonal slope, the posterior side a httle shorter, its dorsal margin 

 straight, sloping into a narrowly produced, obtuse point, slightly con- 

 tracted in front and narrowly depressed along its dorsal margin. Color white 

 but more often flushed with pink, generally heaviest around the borders 



