342 AXEL A. OLSSON 



Donax punctato-striatus Hanley, Sowerby, 1866, Thes. Conch., vol. 3, Donax, p. 310, 



pi. 281, figs. 49, 50. 

 Donax punctatostriatus Hanley, Hertlein and Strong, 1949, Zoologica, vol. 34, pt. 4, p. 



255, pi. 1, fig. 17. 



Shell elongately subtrigonal, the beaks and umbones somewhat elevated 

 and gibbous and placed a little behind the middle, the anterior side longer, 

 its dorsal and ventral sides approaching each other to form a rounded or 

 somewhat pouting end. The posterior umbonal slope is weakly angled but 

 never sharply so. The surface is generally marked with small, narrow, 

 radial riblets, their interspaces typically well pitted or coarsely cross- 

 threaded but some shells which may appear superficially smooth will show 

 on close examination fine punctation. The surface color is white, light 

 brown, or violaceous, the interior white or irregularly blotched with purple. 

 The margins are coarsely crenulated. 



Length 28 mm., height 16.7 mm., diameter 11 mm. 



Length 34 mm., height 21.8 mm., diameter 14.4 mm. 



Hertlein and Strong mention specimens as large as 44.8 mm. in length 

 and 30 mm. in height. 



Carpenter's Donax punctatostriatus caelatus has not been figured 

 but its description suggests a young D. punctatostriatus generally more 

 elongated than the adult and with the radial interspaces strongly cross- 

 threaded rather than punctate but the types should be reexamined. 



Although D. punctatostriatus has often been cited as ranging south- 

 ward to Peru, the typical form of the species seems to be restricted to the 

 northern portion of the Panamic-Pacific province. 



Range — Lower California to Panama. Especially common along the 

 Mexican coast. 



Donax carinatns Hanley Plate 60, figures 4-4b 



Donax car'mata Hanley, 1843, Proc. Zool. Soc. London, pt. 11, p. 5. Hab. ? — Hanley, 



1843, Cat. Rec. Bivalve Shells, p. 84; 1856, p. 349, pi. 14, fig. 28 (as carinatus 

 on explanation of plate). — Reeve, 1854, Conch. Icon., vol. 8, Donax, pi. 2, fig. 11. 



Donax carinatus Hanley, Sowerby, 1866, Thes. Conch., vol. 3, Donax, p. 305, No. 2, pi. 

 280, figs. 4, 5.— Hertlein and Strong, 1949, Zoologica, vol. 34, pt. 4, p. 253, 

 pi. 1, fig. 9. 



Donax culminatus Carpenter, 1855, Cat. Mazatlan Shells, Brit. Mus., p. 43. (Young 

 shell). 



Shell much longer than high, convex, beaks posterior of the middle 

 with a sharp posterior umbonal angle setting off a strongly flattened to ex- 

 cavated posterior area. There is often a shallow furrow or a depressed zone 

 across the middle of the shell disk which slightly indents the ventral margin. 

 The surface of the shell is smooth and polished, its sculpture formed by 

 fine, flattened, radial riblets between narrowly grooved or lined interspaces, 

 smooth over the greater portion of the surface but with the riblets finely 

 beaded or cancellated on the posterior slope. Color of shell usually a rich 

 mahogany brown blended with violet or purple, the interior violaceous 

 white. 



Length 3S.5 mm., height 19 mm., diameter 13.75 mm. Camarones. 



Length 42.9 mm., height 22.2 mm., diameter 15.25 mm. Tumbez. 



The finest species of Donax in the Panamic region, distinguished by its 

 relatively large size, elongated form, pointed posterior extremity, sharply 



