188 Kansas Academy of Science. 



scure, sometimes prominent, tooth in each valve; pallial sinus deep-, 

 surface concentrically or feebly sculptured. My a glycymeris Born, 

 is a characteristic species. 



20. Panopea generosa Gould. Plate III, fig. 20. 



Panopea generosa Gld., Proc. Bost. Soc. Nat. Hist., vol. Ill, 1850, p. 215. 

 ' Wilkes's Expl. Exped., vol. XII, p. 385, pi. XXXIV, fig. 507, 1852. 

 Glycymeris generosa Gld., H. & A. Adams, Gen. Rec. Moll., p. 350, 1853. 



Carpenter, Brit. Assn. Rept., 1863, p. 637. Gabb, Pal. Cal, vol. II, p. 



89, 1869. Cooper, 7th Ann. Rept. Cal. St. Min., 1888. p. 241. Keep, 



West Coast Shells, p. 209, fig. 178, 1892. Williamson, Proc. U. S. Nat. 



Mus., vol. XV, 1892, p. 183. Dall, Wagner Inst. Sci., vol. Ill, part 4, 



1898, p. 830. *3 

 Panopea generosa Gld., Arnold, Mem. Cal. Acad. Sci., vol. Ill, pp. 182, 183. 



Shell large and ponderous, rather thin, somewhat quadrilateral 

 in adult specimens; the basal and hinge margins are parallel and 

 straight in adult specimens; posterior extremity broadly truncated, 

 somewhat obliquely; anterior extremity broadly rounded; anteriorly 

 the shell gaps slightly and the valves are somewhat everted; sur- 

 face coarsely undulating concentrically; beaks sharp and prominent 

 and placed slightly anterior; anterior umbonal slope tumid; pos- 

 terior slope a little compressed; hinge rather slender, with a single, 

 erect, obliquely triangular tooth in each valve; ligament external; 

 pallia] sinus wide and shallow; posterior muscular scar but little 

 broader than the pallial impressions; siphonal sinus shallow, small. 



Dimensions of largest specimen obtained: Length, 86; alt., 49-. 

 diam., 26. 



Living: Puget Sound to San Diego, Cal. (Dall); Neah Bay. 

 Quillayute Bay, Wash. (Reagan). 



Pleistocene: San Pedro (Arnold); Santa Barbara to San Diego, 

 Cal. (Cooper). 



Pliocene: San Fernando, Santa Barbara (Cooper); Santa Bar- 

 bara, San Pedro (Arnold); Quillayute, Wash. (Reagan). 



Oligocene-Miocene: Upper horizon, East Clallam, Wash. (Rea- 

 gan). 



This species is rare both in the Pliocene and in the Oligocene- 

 Miocene formations. 



The specimen figured is from the Upper horizon, East Clallam. 



Superfamily Adesmacea; Family Teredinidte; Genus Teredo Linne. 

 21. Teredo sp. PlateHI, fig. 21. 

 A float-rock found near East Clallam contained many tubes of a 

 small Teredo, but the species could not be determined. 



45. After Arnold, loc. cit. 



