PANAMIC.PACIFIC PELECYPODA 367 



by their rose-red color and sharp, rasplike sculpture. The right valve is 

 slightly more convex, the anterior and posterior margins more expanded and 

 overlapped by the margins of the left valve. The species is closely allied 

 to S. learm Dall from the Pliocene of southern Florida. 



Range — Peru to Mexico. Panama: Bucaro. Panama Canal Zone: 

 Venado Beach. Ecuador: Manta. Peru: Tumbez, 



Semele sowerbyi Lamy Plate 65, figures 7, 7a 



Amphidesma Purpurascens Sowerby, 1833, Proc. Zool. Soc. London for 1832, p. 199 "St. 

 Elena, W. Col."— Sowerby, 1833, Conch. Illust., pi. 18, fig. 5.— Reeve, 1853, 

 Conch. Icon., vol. 8, Amphisdesma, vol. 8, pi. 6, fig. 37. (Not Fenus purpurascens 

 Gmelin, 1792. (Semele). 



Semele soiuerbyi Lamy, 1912, Bull. Mus. Nat. Hist. Paris, vol. 18, No. 3, p. 165 footnote. 

 — Lamy, 1914, Jour, de Conchyl., 4th ser., vol. 61, pp. 328, 352 footnote. (New 

 name to replace S. purpurascens (Sowerby), 1833, not S. purpurascens (Gmslin), 

 1792, an Atlantic species). — Hertlein and Strong, 1949, Zoologica, vol. 34, pt. 

 4, p. 248 (footnote). 



Shell subovate to subelliptical, the dorsal side low trigonal with nearly 

 median beaks, the ventral side broadly rounded. Valves are nearly similar 

 and subequilateral, the posterior side slightly narrower with an impressed, 

 slightly flexuous dorsal area, the end subtruncate. Sculpture formed by 

 numerous, small, thin concentric lamellae or ridges evenly spaced between 

 flattened interspaces, the edges of the lamellae and their interspaces are 

 minutely, radially striate. Color generally in shades of violet or purple, 

 lighter ventrally and deeper on the umbones, the tip of the beak usually 

 marked with a white streak. Interior white flushed with purple. 



Length 47 mm., height 36.3 mm., diameter 13 mm. San Jose Islands, 

 Pearl Island, Panama. USNM 588133 



Length 44.3 mm., height 36.5 mm., semidiameter 4.5 mm. a right valve, 

 Manta, Ecuador. 



This is a rare and imperfectly known species. Specimens from Panama 

 have a higher and more ovate shape than those from Ecuador. The species 

 is closely related to S. perlamellosa Heilprin from the Pliocene of southern 

 Florida. 



Range — Panama to Ecuador. Panama: San Jose Island (Pearl Islands), 

 Coll. J. P. E. Morrison, USNM 588133. Ecuador: Suya; Manta; Santa Elena. 



Semele jovls (Reeve) Plate 66, figure 12; 



Plate 85, figure 7, 7a 



Amphidesma jovis Reeve, 1853, Conch. Icon., vol. 8, Amphidesma, pi. 5, fig. 34. Hab ? 



Tellina barbarae Boone, 1928, Bull. Bingham Oceanogr. Coll. Peabody Museum, Yale 



University, vol. 2, art. 5, p. 9, pi. 1, upper figure Pearl Islands. 

 Semele jovis (Reeve), Hertlein and Strong, 1949, Zoologica, vol. 34, pt. 4, No. 19, pp. 



244, 245.— Hertlein and Strong, 1955, Bull. Amer. Mus. Nat. Hist., vol. 107, 



art. 2, pp. 201, 202. 



Shell subovate to subelliptical, weakly convex. Valves subequal and 

 subequilateral, with nearly median flattened umbones and small beaks, the 

 posterior side differing from the anterior by its slightly narrower form and 

 weaker flexure. Surface sculptured over the whole disk with small, closely 

 spaced, raised lamellae with minute, radial lineation present in their inter- 

 spaces on the anterior slope. Color white to a pinkish brown, the umbones 

 orange to red, usually with a small, white streak across them. Interior 

 white, with a well-rounded pallial sinus, often brown in the middle. 



