S96 AXEL A. OLSSGN 



Length 50.4 mm., height 28.4 mm., diameter 9.4 mm. An average 

 specimen. 



This is a lovely rose-red species, its range confined to the Ecuadorian 

 coast as far as known. 



Range — Coast of Ecuador, San Francisco; Mompiche; Charapota; 

 Jaramijo; Manta; Punta Blanca; Manglaralto. 



Eurytelllna (Enrytellina) inaeqnistriata (Donovan) Plate 71, figures 9, 9a 



Tellina inaequistriata Donovan, 1802, Nat. Hist. British Shells, vol. 4, pi. 123 (two 

 figures).— Hanley, 1846, Thes. Conch., vol. 1, Tellina, p. 238, No. 31, pi. 58, 

 fig. 80. (Not fig. 58, pi. 57). Bay of Guayaquil. — Sowerby, 1867, Conch. Icon., 

 vol. 17, Tellina, pi. 36, figs. 202a, b. Bay of Guayaquil. 



Tellina (Eurytellina) inaequistriata Donovan, Hertlein and Strong, 1949, Zoologica, vol. 

 34, pt. 2, pp. 74, 75, pi. 1, fig. 18. — Hertlein and Strong, 1955, Bull. Amer. Mus, 

 Nat. Hist., vol. 107, art. 2, 198. 



Tellina (Eurytellina) leucogonia Dall, 1900, Proc. U.S. Nat. Museum, vol. 23, No. 1210, 

 p. 317, pi. 4, fig. 5. 



Shell relatively small (length 25 to 35 mm.), trigonal-elongated, moder- 

 ately heavy, slightly convex to compressed, subequilateral, the anterior side 

 is a trifle longer and wider than the posterior. Color light rose-pink, often 

 arranged in lighter and darker concentric bands, suffused with yellowish 

 brown, the dorsal margins and umbones usually white. Surface plain, often 

 nearly smooth and polished (especially on the left valve) but with an 

 underlying sculpture of evenly spaced, incised lines forming narrow, con- 

 centric bands which may be weakly or well developed; this type of sculp- 

 turing may be developed over the whole surface or it may be much coarser 

 on the posterior-middle section of the disk. The texture of the shell is 

 usually heavy, the adductor scars are deeply impressed, the anterior one 

 bordered posteriorly by a thickened ray. Upper limb of the pallial sinus 

 does not touch the lower, inner side of the spatula-shaped, anterior adductor 

 scar. Extremely fine radial striae are visible under the lens and the anterior 

 margin of the valve is often strongly crenulated. 



The fine crenulation of the ventral margin along its anterior side Is 

 the most striking feature of this shell, a character unique amongst other 

 species of the genus. The shell is heavy, the adductor scars sunk deeply, 

 the anterior scar bordered behind by a thickened ray. The species occurs 

 as a Pleistocene fossil on the Burica Peninsula, Panama. 



Range— G\x\{ of California to Ecuador. Panama: Several stations cited 

 by Hertlein and Strong, 1955. Ecuador: Gulf of Guayaquil. 



EnrytelLna (Eurytellina) simulans (C. B. Adams) Plate 71, figures 1, la 



Tellina punicea Born, Hanley, 1846, Thes. Conch., vol. 1, Tellina, p. 240, No. 33, pi. 



60, fig. 154 Xipixapi. (Not T. punicea Born, 1780). 

 Tellina simulans C. B. Adams, 1852, Ann. Lyceum Nat. Hist. New York, vol. 5, pp. 509, 



546, No. 471.— Maxwell Smith, 1944, Panamic Marine Shells, p. 65, fig. 840.— 



Turner, 1956, Occas. Papers on MoUusks, Mus. Comp. Zool., vol. 2, No. 20, 



pp. 86, 87, pi. 18, figs. 5, 6. 

 Tellina (Eurytellina) simulans C. B. Adams, Hertlein and Strong, 1949, Zoologica, vol, 



34, pt. 2, No. 9, p. 79. 



Shell as a rule of small or medium size, seldom exceeding 45 mm. in 

 length, oblong-elliptical, the beaks nearly median, the posterior side being 

 narrower, its dorsal margin straight, descending to an obliquely sub- 

 truncated end. Valves are but weakly convex, almost flat, subsolid, generally 

 showing an internal thickened ray along the inner side of the anterior ad- 



