414 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



MACOMA BROTA, new variety, LIPARA. 



Shell resembling hrota but more rotund, less rostrate, with a wider 

 and rounder anterior end, shorter and more rounded posterior end, 

 and more polished surface. The respective measurements are as 

 follows, in millimeters: 219,461; M. hrota: Height, 53; length, 74; 

 diameter, 22; posterior end, 32. 223,032; M. Ivpara: Height, 57; 

 length, 74; diameter, 25; posterior end, 33. Cat. No. 223032, 

 U.S.N.M. 



Both have the same distribution south of Bering Strait, but I have 

 not seen lipara from Arctic waters. Both reach Puget Sound. 



MACOMA INQUmATA Deshayes, 1854. 



New variety artiheimi. Shell resembling the typical inquinata but 

 shorter, and relatively more plump; the beaks 15 mm. behind the 

 anterior end; the basal margin somewhat produced; the rostration 

 shorter, less pronounced and less obliquely twisted. Length, 38; 

 height, 30; diameter, 15 mm. Cat. No. 122537, U.S.N.M. 



Kodiak Island, Alaska, Arnheim. 



MACOMA QUADRANA, new species. 



Shell small, white, polished, intermediate between M. carlottensis 

 Whiteaves, and M. injlatula Dall, but smaller than either; perios- 

 tracum pale straw color, slightly iridescent, microscopically concen- 

 trically striated; anterior end larger, posterior end short, obliquely 

 subtrimcate, the rostrum slightly bent to the right; the right valve a 

 little flatter than the left; two faint low riblets extending from the 

 beaks to the posterior basal angle ; hinge very weak, pallial sinus deep 

 and high. Length, 19; height, 13.5; diameter, 7 mm. Cat. No. 

 225421, U.S.N.M. 



Boca de Quadra, Alaska. Type-specimens from off Point Concep- 

 tion at station 2892, in 284 fathoms 



MACOMA TRUNCARIA, new species. 



Shell small, subquadrate, white, nearly equilateral, the posterior 

 end slightl}^ shorter, attenuated sub truncate; basal margin nearly 

 straight, anterior end evenly rounded, beaks not prominent, dorsal 

 slopes subequal, the posterior steepest; sculpture only of incremental 

 lines irregularly prominent; hinge teeth feeble; interior chalky white, 

 the pallial sinus reaching only to the vertical of the beak, rounded, 

 free from the pallial line. Length, 15; height, 10; diameter, 4 mm. 

 Cat. No. 210916, U.S.N.M. 



Arctic coast between Cape Halkett and Garry River. 



ERVILIA CALIFORNICA, new species. 



Shell small, ovate, white with a rosy flush, inequilateral, the pos- 

 terior end shorter; the beaks inconspicuous, the ends rounded, the 



