213 



20. Semkle decisa, Conr. 



Amphidesma decisa, Conr. Journ. p. 239. pi. 19. f. 2 ; Rve. Conch. 

 Ic. pi. 4. sp. 24. 



Hab. Uua cum prsecedente. Mus. Cuming, Nuttall, Brit., Jay. 



Of this very characteristic shell, the length is stated by Conrad 

 (probably erroneously) to be 5 inches. It grows however to a large 

 size. 



= Amphidesma roseum, Brod. & Sow., teste Gould. 



21. CuMiNGiA Californica, Conr. Journ. p. 234, pi. 1/. f. 12. 

 Hab. Sta. Barbara, infrequens ; Mazatlan, do. Mus. Cum., Brit., 



Jay. 



— 22, Tellina altą, Conr. Journ. p. 258; Hanl. Rec. Shells, 

 p. 71 ; Jay's Cat. no. 520. 



Hab. Sta. Barbara. Mus. Jay. 



According to Conrad, this shell has the outline of a Capsa, Enc. 

 Mėth. pi. 231. f. 1. Mr. Nuttall and I, however, mayhave erred in 

 regarding the shell described in P. Z. S. 1855, p. 230, as 1 Scrobi- 

 cularia biangulata as being distinct. 



23. Tellina edentula, Brod. & Sow. Zool. Journ. iv, p. 363 ; 

 Zool, Beech, Voy. p, 154. pi. 41. f. 5, et pi. 44. f, 7; Mid. Mal, 

 Ross. p, 62. 



This species grows to a very large size, and is eaten by the Chin- 

 hooks at the estuary of the Oregon. 



Hab. Oregon. Mus, Nuttall, 



— 24, Tellina nasuta, Conr. Journ. p, 258 ; Hanl, Rec. Shells, 

 p. 71 ; Sow. Thes, Conch, p, 314, pi. 64. f. 224 ; Middendorff, Siber, 

 Reise, p. 256, no. 5^^. pi. 23, f. 6-11 ; Jay, Cat, no. 633. 



Hab. San Diego {Nuttall), teste Conrad ; Tugurbuseu, Okotsk 

 Sea {Middendorff). Mus. Jay. 



25. Tellina secta, Conr. Journ, p, 257; Hanl. Rec, Shells, 

 p. 67. 



= T. ligamentina, Desh. in Guer. Mag. 1843, pi. 81, teste Jay, 

 Cat, no, 633. 



Hab. San Diego, inter paludes limosas. Mus, Nuttall, Jay, 



26. DoNAX Californicus, Conr. 



Donax Californica, Conr. Journ. p. 254. pi. 19. f. 21 (nonD, Cali- 

 fornicus, Desh., vide B. M. Mazatlan Cat. p. 4/. no. 7G)- 



Hab. Sta. Barbara, inter arenam. Mus. Nuttall, Brit., &c. 



This is a small, gibbous shell, resembling D. punctatostriatus, but 

 without the dots. The D. Californicus of Deshayes is the young 

 State of the vvhite variety of the D. Conradi of the šame author. 



=: Donax obesus, Phil, 



