PANAMIC-PACIFIC PELECYPODA S49 



The shell is similar to S. tellinoides but much smaller (length up to 

 about 35 mm.), more ovate, higher, the beak and umbone more median in 

 position, the posterior end, therefore, only a trifle longer. Color white to 

 pink, the umbone often a deep rose-red. Pallial sinus deep, with a high 

 angle in the middle. 



Length 31 mm., height 21 mm., diameter 11.2 mm. Pilsbry and Lowe. 



Length 34.2 mm., height 22.7 mm., diameter 13.2 mm. Guanico, Panama. 



A small lovely shell recalling the Caribbean S. sanguinolenta but of a 

 more ovate form and with a higher, more steeply angled pallial sinus. 

 Range — Mexico south to Panama. Panama: Guanico. 



Sangnlnolaria (Sang-uinolarla) tennis, new species Plate 85, figure 6 



The shell is small, thin, translucent, subovate to subelliptical, the 

 beaks submedian with low umbones. 1 he two ends of the shell are subequal, 

 the posterior side a trifle longer. Surface covered with fine lines of growth. 

 Pallial sinus large, with a high angle in the middle and fully confluent 

 with the paUial line below. Hinge delicate. 



Length 32.9 mm., height 21 mm., diameter 11 mm. Canoa, Ecuador. 

 Holotype, ANSP 218911. 



From S. vespertina, this species differs by its more ovoid shell, the two 

 ends are alike and nearly equally rounded. Color is white with a faint flush 

 of pink. The type specimen was obtained at Canoa near Bahia, Ecuador. 

 Another, but more fragmentary shell, was found at Punta Montanita to 

 the north of Manglaralto, Ecuador. 



Range — Ecuador. Ecuador: Canoa; Punta Montanita. 



Subgenus PSAMMOTELLA Herrmannsen, 1852 



Type species by monotypy, Tellina rufescens Chemnitz (=^T. operculata 

 Gmelin). 



Generally similar to Sanguinolaria, sensu stricto but longer, with un- 

 equal valves, the right valve is strongly convex, the left flattened. The 

 posterior side is narrowed and weakly flexed at the end. 



Sanguinolaria (Psanunotella) bertini Pilsbry and Lowe Plate 77, figure 8 



Tellina rufescens Chemnitz, Hanley, 1846, Thes. Conch., vol. 1, p. 307, pi. 63, fig. 213. 



(Not Tellina rufescens Chemnitz, 1792, Syst. Conchyl.-Cab., bd. 6, p. 105, taf. 



11, fig. 97 or Tellina rufescens Gmelin, 1791. 

 Tellina hanleyi Bertin, 1878, Nouv. Arch. Mus. Hist. Nat, sen 2, vol. 1, p. 268. (Not 



Tellina hanleyi Dunker, 1853). 

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



84, p. 91, pi. 10, figs. 7, 8.— Maxwell Smith, 1944, Panamic Marine Shells, 



p. 63, fig. 811. — Hertlein and Strong, 1950, Zoologica, vol. 35, pt. 4, p. 220. 



Shell large with a length up to 92 mm., elongate, subelliptical, the right 

 valve is strongly convex, the left flattened. Color is usually a rose-pink 

 to nearly white on beach specimens. S. operculata (Gmelin) from the Carib- 

 bean is similar and in a large series may not be distinguishable. 



Length 71 mm., height 36.4 mm., diameter 15 mm. Guanico, Panama. 



Range — Gulf of California to northern Peru. Panama: Guanico. Colom- 

 bia: Isla del Gallo. Ecuador: Esmeraldas; San Francisco. Peru: Tumbez; 

 . Punta Picos; Mancora; Lobitos. 



