NO. 1210. SYNOPSIS OF NORTH AMERICAN TELLINID^E— BALL. 821 



This specie.s is much more acute behind than Tellina {Oudardla) com- 

 pre^ssa Brocchi, of the Mediterranean, and has not the oblique sculp- 

 ture on the disk of that species. 



The species named Angulus laodestuii l)y C^arpenter, as represented 

 l)y the type specimen from Pug'et Sound, is quite distinct from the 

 form subsequently named by him variet}^ ohtusus^ from southern Cali- 

 fornia. The name ohfii.st(x ])eing preoccupied for a species of TiUina^ 

 I propose the above specific name in honor of Mr, Fred. L. Button, of 

 Oakland, California, an enthusiastic student of Caiifornian shells. It 

 belongs to the section Oudardia of Monterosato, characterized by 

 having- the elevated ray sharpl}' defined, but is almost exactly inter- 

 mediate between the more common forms of Angrdux like A. tener 

 Say and the typical species of Oudardia^ which approaches Scissula 

 by its oblique external grooving. 



TELLINA (PERONIDIA) SANTAROSiE new species. 

 (Plate III, fig. 6; plate IV, figs. 1, 2.) 



Shell Avhite, frequently with pale brownish concentric zonulation, 

 and subtranslucent radial venulations; valves rather thin, compressed, 

 hardly flexuous behind, beaks low, and nearly central; surface pol- 

 ished, concentrically evenly grooved with wider flat interspaces 

 especiall}" on the anterior half of the disk; on the posterior fourth of 

 the right valve the interspaces are narrowed and elevated showing a 

 tendency to become lamellose; if an imaginary line be drawn from 

 the beak to the basal margin, in front of that line in the adult the 

 concentric sculpture seems to fail suddenly, leaving an obscurely tri- 

 angular area almost without sculpture; on the left valve the sculpture 

 is not interrupted but appears feebler over the whole disk than in the 

 right valve; hinge with the laterals obsolete, posterior radial callus 

 not difi^erentiated into a ray, pallial sinus low, short, mosth^ coalescent 

 below. Lon. 51.5, alt. 21.5, diam. 6 mm. The dimensions of a 

 similar valve of TdJina hodegensis Hinds are: Lon. 52, alt. 21, diam. 

 9.5 mm.; the beaks in the former arc 20 mm. in front of the posterior 

 end of the shell, while in the latter the distance is 23 mm. 



Ti/j)e.—^o. 60212, U.S.N.M., collected at Santa Rosa Island, of the 

 Santa Bar])ara group, California, l)y Stephen Bowers. 



This shell is perhaps a southern race of Telllna hodegensis^ or may 

 prove to be a distinct species with more material. It is confined to 

 the region about the islands and San Pedro; the northernmost specimen 

 is from Santa Barbara, on the mainland. But we have typical speci- 

 mens of Telllna hodegensis from as far south as San Diego. Telllna 

 santaros(e seems to differ by its thinner, flatter, and more compressed 

 shell, by details of sculpture, the form of the pallial sinus, and by 

 being more equilateral. 



Proc. N. M. vol. xxiii 21 



