Geological Papers. 209 



bous when mature, and by their having a thick shell and heavy 

 cardinal teeth. They also differ from the living 7! crassatelloides 

 in having their beaks more central. 



A very abundant species in the Quillayute Pliocene. 



Living: San Diego to Santa Cruz, Cal. (Cooper). 



Subfamily Tapetin^e. 



38, Paphm (Tapes) statleyi Gabb. Plate IV, figs. 38a, b, c. 

 Dosinia staleyi Gabb, Pal. Cal., vol. II, p. 24, pi. 7, fig. 42. 

 Tapes staleyi Gabb, Pal. Cal., vol. II, 1869, p. 57, pi. 16, figs. 17, 17a, 



Shell large, subcircular, convex, thick, very inequilateral; beaks 

 large, prominent, anterior, and turned forward; lunule faint, rather 

 large, slightly sunken ; hinge same as Tapes staminea; surface 

 sculpture also same as T. staminea, except that the ribs and frills 

 are at least four times as numerous as in that species; pallial sinus 

 very deep and rather narrow. 



This is a very abundant species in the Pliocene at Quillayute, 

 Wash. 



Very common in the Tertiary of California (Gabb). 



Pliocene: Quillayute, Wash. (Reagan). 



Superfamily Tellinacea; Family XXX Tellinid^e. 

 Genus Macoma Leach; Sungenus Macoma s. s. 



Shell subtrigonal, smooth, usually colorless; anal siphon long; 

 brachial siphon very short; pallial sinus coalescent with the pallial 

 line below; hinge without laterals; inhabiting the cooler seas, and 

 especially boreal waters. 



39. Macoma inquinata Deshayes. Plate IV, fig, 39, 



Tellina inquinata Desh., Proc, Zool. Soc. 1854, p. 357, 



Macoma inquinata Desh., Carpenter, Brit. Assn. Rept., 1863, p. 89, Gabb, 

 Pal. Cal. vol. II, p. 93, 1869, Cooper, 7th Ann. Rept, Cal. St. Min., 1888, 

 p. 248. Keep, West Coast Shells, p. 195, 1892. Dall, Trans, Wagner 

 Inst. Sci.. vol. III. part 5. 1900, p. 1053. Arnold, Mem, Cal. Acad. Sci,, 

 vol. III, p. 162, 163, pi, XVI, fig. 4, 1903. 



Shell suboval, convex, equivalve; umbones subcentral; posterior 

 end evenly arcuate from umbo and acutely rounded from about half 

 way between dorsal and ventral margins to posterior extremity; 

 anterior end rather prominently dilated, especially so in front of 

 umbo of right valve; interior of shell not seen. 



Demensions of right valve of the largest and most perfect speci- 

 men obtained: Lat., 42; alt.. 34; diam., 14; from umbo to posterior 

 extremity, 29; to anterior extremity, 31. 



This species is rare in the Quillayute formation, represented at 

 the mouth of Maxfield creek, near Quillayute. 

 -14 



